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UK Climb Survey
Reproducible LiDAR gradient ladders for British road climbs. Every maximum states its measurement distance — because a hill can honestly be 32% over 2 m and 25% over 100 m at once. How to read these numbers →
Steepest 10 m
| # | Climb | Max | Length | Overall |
|---|---|---|---|---|
| 1 | Berwyn to Geraint Hill° | ≈42.4% | 3790 m | 7.5% |
| 2 | Llangollen to Blaen-Bache Dingle° | ≈41.3% | 2680 m | 10.4% |
| 3 | Rhiw Syr Dafydd | ≈40.0% | 125 m | 20.6% |
| 4 | Sennybridge to Yr Allt° | 39.7% | 1412 m | 3.9% |
| 5 | Mountain Road | ≈39.7% | 514 m | 10.4% |
| 6 | Melin-y-coed to Pant-y-maes° | ≈38.2% | 2452 m | 10.7% |
| 7 | Yr Allt | ≈37.4% | 655 m | 7.7% |
| 8 | Yr Allt | ≈37.4% | 562 m | 9.0% |
| 9 | Allt y Badi (south side) | ≈37.4% | 2707 m | 9.0% |
| 10 | Fforest Road | ≈37.4% | 925 m | 12.5% |
| 11 | Bethlehem to Carn Powell° | ≈36.7% | 3549 m | 5.7% |
| 12 | Llandeilo Road | ≈36.7% | 2628 m | 4.9% |
| 13 | Cwm Sŷch to Cwm Dyfnant° | ≈36.5% | 4617 m | 3.4% |
| 14 | Ffordd Pen Llech | ≈36.3% | 237 m | 17.2% |
| 15 | Hafod Lane | ≈36.0% | 2898 m | 4.5% |
≈ measured under tree canopy or near a structure at this window — the value is less certain, not wrong. Each climb page details what was flagged and why.
Steepest 25 m
| # | Climb | Max | Length | Overall |
|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈32.6% | 237 m | 17.2% |
| 2 | Allt y Badi (south side) | ≈31.7% | 2707 m | 9.0% |
| 3 | Mountain Road | ≈31.4% | 514 m | 10.4% |
| 4 | Route Des Alpes | ≈31.0% | 2392 m | 5.7% |
| 5 | Llangollen to Blaen-Bache Dingle° | ≈30.9% | 2680 m | 10.4% |
| 6 | Melin-y-coed to Pant-y-maes° | ≈30.3% | 2452 m | 10.7% |
| 7 | Lane near Cellan° | ≈30.1% | 2094 m | 5.9% |
| 8 | Heol Feurig | ≈30.0% | 284 m | 11.5% |
| 9 | Llandeilo Road | ≈29.8% | 2628 m | 4.9% |
| 10 | Bethlehem to Carn Powell° | ≈29.6% | 3549 m | 5.7% |
| 11 | Coronation Street | 29.6% | 307 m | 11.4% |
| 12 | Rhiw Syr Dafydd | ≈29.6% | 125 m | 20.6% |
| 13 | Sennybridge to Yr Allt° | ≈29.5% | 1412 m | 3.9% |
| 14 | Parc-Seymour to Castell-prin° | ≈29.5% | 974 m | 2.5% |
| 15 | Lane near Blaenllechau° | ≈29.4% | 447 m | 6.7% |
≈ measured under tree canopy or near a structure at this window — the value is less certain, not wrong. Each climb page details what was flagged and why.
Steepest 50 m
| # | Climb | Max | Length | Overall |
|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈29.8% | 237 m | 17.2% |
| 2 | Melin-y-coed to Pant-y-maes° | ≈29.5% | 2452 m | 10.7% |
| 3 | Mountain Road | ≈28.5% | 514 m | 10.4% |
| 4 | Llanguicke Road | ≈28.4% | 1172 m | 13.3% |
| 5 | Ffordd Bryn Fran | ≈27.9% | 2943 m | 9.9% |
| 6 | Dinas Oleu Lane | ≈27.8% | 198 m | 21.5% |
| 7 | Ffordd Llwyn Du | 27.4% | 1494 m | 12.2% |
| 8 | Pound Lane | ≈27.0% | 1461 m | 10.5% |
| 9 | Lane near Fron° | ≈27.0% | 492 m | 18.1% |
| 10 | Cefn Llan | ≈26.6% | 218 m | 19.4% |
| 11 | Heol Feurig | ≈26.5% | 284 m | 11.5% |
| 12 | Bryncethin Road | ≈26.5% | 1635 m | 8.9% |
| 13 | Cwrdy Lane | ≈26.4% | 1757 m | 9.0% |
| 14 | Coronation Street | 26.3% | 307 m | 11.4% |
| 15 | Clifton Hill | 26.2% | 141 m | 23.9% |
≈ measured under tree canopy or near a structure at this window — the value is less certain, not wrong. Each climb page details what was flagged and why.
Steepest 100 m
| # | Climb | Max | Length | Overall |
|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈26.5% | 237 m | 17.2% |
| 2 | Dinas Oleu Lane | ≈25.3% | 198 m | 21.5% |
| 3 | Cefn Llan | ≈25.1% | 218 m | 19.4% |
| 4 | Clifton Hill | 24.9% | 141 m | 23.9% |
| 5 | Mount Road | ≈24.4% | 825 m | 11.5% |
| 6 | Ffordd Bryn Fran | ≈24.4% | 2943 m | 9.9% |
| 7 | Pant Du | ≈24.3% | 825 m | 12.3% |
| 8 | Vine Row | ≈24.1% | 667 m | 12.3% |
| 9 | Melin-y-coed to Pant-y-maes° | ≈24.0% | 2452 m | 10.7% |
| 10 | Ffordd Llwyn Du | 24.0% | 1494 m | 12.2% |
| 11 | Partrishow Hill to Partrishow° | ≈23.9% | 2447 m | 6.3% |
| 12 | Pound Lane | ≈23.9% | 1461 m | 10.5% |
| 13 | Cwrdy Lane | ≈23.8% | 1757 m | 9.0% |
| 14 | Allt y Badi (south side) | ≈23.6% | 2707 m | 9.0% |
| 15 | Lane near Glyn Ceiriog° | ≈23.5% | 522 m | 11.4% |
≈ measured under tree canopy or near a structure at this window — the value is less certain, not wrong. Each climb page details what was flagged and why.
Largest elevation gain
| # | Climb | Gain | Length | Overall |
|---|---|---|---|---|
| 1 | Llanellen to Cefn y Galchen° | 452 m | 5964 m | 7.6% |
| 2 | Cwm y Gâth to Bryn-y-Fedwen° | 423 m | 9334 m | 4.5% |
| 3 | Tal-y-bont to Pen-y-gaer° | 335 m | 3381 m | 9.9% |
| 4 | Lawnt to Tir Mostyn° | 331 m | 9367 m | 3.5% |
| 5 | Dardy to Blaen Onneu° | 328 m | 6272 m | 5.2% |
| 6 | Adams Street to Cerrig yr Hafan° | 325 m | 11250 m | 2.9% |
| 7 | Cyffredyn to Blaen Onneu° | 323 m | 4794 m | 6.7% |
| 8 | Rhigos Road | 305 m | 6004 m | 5.1% |
| 9 | Llangynog to Cwm Pydew° | 304 m | 7377 m | 4.1% |
| 10 | Welsh Harp Hollow | 304 m | 3695 m | 8.2% |
| 11 | Ffordd-las to Hay Bluff° | 294 m | 6927 m | 4.2% |
| 12 | Ffordd Bryn Fran | 292 m | 2943 m | 9.9% |
| 13 | Creigiau'r Llyn to Foel Y Groes° | 286 m | 6349 m | 4.5% |
| 14 | Berwyn to Geraint Hill° | 286 m | 3790 m | 7.5% |
| 15 | Llanybydder to Mynydd Llanybyther° | 286 m | 6003 m | 4.8% |
All climbs (241)
| Climb | Area | Known from | Shape | Length | Gain | Overall | Max 25 m |
|---|---|---|---|---|---|---|---|
| Aberdyfi to Ffridd Cefn-isaf° | near Aberdyfi · Gwynedd | — | sustained | 1610 m | 181 m | 11.2% | 20.9% |
| Aberedw to Pontsioni° | near Aberedw · Powys | — | sustained | 654 m | 93 m | 14.3% | 26.5% |
| Aberffrwd Hill | near Aberffrwd · Sir Ceredigion - Ceredigion | — | sustained | 2372 m | 237 m | 10.0% | ≈26.1% |
| Adams Street to Cerrig yr Hafan° | near Cwm Twrch · Sir Ceredigion - Ceredigion | — | sustained | 11250 m | 325 m | 2.9% | 16.9% |
| Allt Bron Philip | near Llanddona · Sir Ynys Mon - Isle of Anglesey | — | sustained | 1442 m | 139 m | 9.6% | ≈26.2% |
| Allt Goch Fawr | near Nant Meigan · Sir Ynys Mon - Isle of Anglesey | sign: 25% (2026) | stepped | 1266 m | 83 m | 6.5% | ≈15.0% |
| Allt y Badi (south side) | near Glyn Ceiriog · Wrecsam - Wrexham | tag: 25% (2026) | stepped | 2707 m | 243 m | 9.0% | ≈31.7% |
| Bank Road | near Matlock · Derbyshire | 100 Climbs1 | sustained | 530 m | 57 m | 10.7% | 15.5% |
| Bedwellty Road | near Aberbargoed · Caerffili - Caerphilly | — | sustained | 1891 m | 144 m | 7.6% | 21.0% |
| Berwyn to Blaen-Bache Dingle° | near The Dingle · Sir Ddinbych - Denbighshire | — | sustained | 6052 m | 276 m | 4.6% | ≈21.7% |
| Berwyn to Geraint Hill° | near The Dingle · Sir Ddinbych - Denbighshire | — | sustained | 3790 m | 286 m | 7.5% | ≈20.9% |
| Bethlehem to Carn Powell° | near Capel Dingle · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 3549 m | 201 m | 5.7% | ≈29.6% |
| Bettws Gwerfil Goch to Pen Hafoty-Foel° | near Bettws Gwerfil Goch · Sir Ddinbych - Denbighshire | — | sustained | 1608 m | 97 m | 6.0% | ≈27.2% |
| Bevan Avenue | near Mochdre · Conwy | — | stepped | 660 m | 61 m | 9.2% | 23.0% |
| Blackvein Mountain Road | near Glenside · Caerffili - Caerphilly | — | sustained | 1688 m | 176 m | 10.4% | ≈25.9% |
| Blaenavon Road | near Cwm Ifor · Sir Fynwy - Monmouthshire | — | sustained | 5439 m | 285 m | 5.2% | ≈14.5% |
| Boughrood to Trewern Hill° | near Llanstephan · Powys | — | sustained | 4401 m | 228 m | 5.2% | 21.9% |
| Brace Avenue | near Blaenau Gwent · Blaenau Gwent | — | sustained | 937 m | 60 m | 6.4% | 21.1% |
| Brongwyn to Capel Tygwydd° | near Troed-y-rhiw-Siôn · Sir Ceredigion - Ceredigion | — | stepped | 1288 m | 64 m | 5.0% | ≈26.0% |
| Bryn Dolwen to Tyddyn° | near Cwm y Glog · Powys | — | sustained | 1499 m | 85 m | 5.7% | 20.2% |
| Bryn Rhyd-yr-Arian to Mynydd Tryfan° | near Dyffryn Aled · Conwy | — | sustained | 2925 m | 148 m | 5.1% | ≈29.0% |
| Bryn Road | near Pen-Rhiw-fawr · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 395 m | 49 m | 12.4% | 21.8% |
| Bryncethin Road | near Cwm Garnant · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 1635 m | 146 m | 8.9% | ≈28.2% |
| Bush Road | near Miskin · Rhondda Cynon Taf | — | sustained | 466 m | 60 m | 12.8% | 22.0% |
| Bwlch Esgair Gelli | near Coed Nant-yr-hwch · Powys | — | sustained | 3694 m | 155 m | 4.2% | 23.7% |
| Bwlch Penbarras | near Llanbedr-Dyffryn-Clwyd · Sir Ddinbych - Denbighshire | 100 Climbs1 | sustained | 2324 m | 260 m | 11.2% | ≈24.4% |
| Bwlch-y-Clawdd Road | near Cwm Dâr · Rhondda Cynon Taf | 100 Climbs1 | sustained | 4804 m | 270 m | 5.6% | 8.9% |
| Cairo Street | near Dinas · Rhondda Cynon Taf | — | sustained | 358 m | 34 m | 9.5% | 22.3% |
| Capel Bangor to Pant-y-crug | near Pant-y-crûg · Sir Ceredigion - Ceredigion | — | sustained | 1389 m | 145 m | 10.5% | ≈21.0% |
| Cefn Llan | near Cwmpadarn · Sir Ceredigion - Ceredigion | sign: 32% (2025) | sustained | 218 m | 42 m | 19.4% | ≈27.4% |
| Cefn Vron Hill to Bryn° | near Anchor · Shropshire | — | sustained | 649 m | 50 m | 7.7% | 20.7% |
| Charles Street | near Trealaw · Rhondda Cynon Taf | — | sustained | 915 m | 97 m | 10.6% | 20.7% |
| Clifton Hill | near Abertawe · Abertawe - Swansea | — | sustained | 141 m | 34 m | 23.9% | 27.8% |
| Clynnog Fawr to Bwlch Mawr° | near Capel Uchaf · Gwynedd | — | stepped | 3170 m | 192 m | 6.1% | 22.8% |
| Commin Road | near Aberbargoed · Caerffili - Caerphilly | — | stepped | 1344 m | 119 m | 8.9% | 21.0% |
| Commins Coch to Darowen° | near Darowen · Powys | — | sustained | 2468 m | 119 m | 4.8% | 26.5% |
| Constitution Hill | near Mount Pleasant · Abertawe - Swansea | Wikipedia2 | sustained | 348 m | 61 m | 17.4% | 21.9% |
| Coronation Street | near Wyndham · Pen-y-bont ar Ogwr - Bridgend | — | stepped | 307 m | 35 m | 11.4% | 29.6% |
| Craig Y Pant to Foel Y Groes° | near Cwm Cerddin · Gwynedd | — | sustained | 1214 m | 188 m | 15.5% | 23.8% |
| Creigiau'r Llyn to Foel Y Groes° | near Cwm Eunant · Powys | — | sustained | 6349 m | 286 m | 4.5% | ≈19.7% |
| Crossway to Tyn Green Castle° | near Crossway · Powys | — | stepped | 2848 m | 112 m | 3.9% | 22.1% |
| Cwm Dulais to Cwm Ysgiach° | near Cwm Dulais · Abertawe - Swansea | — | stepped | 1908 m | 39 m | 2.0% | 27.1% |
| Cwm Ffrydlan to Bryn Mawr° | near Cwm Esgaireira · Powys | — | stepped | 3364 m | 193 m | 5.8% | ≈27.0% |
| Cwm Llwynau to Cwm Cnyw° | near Cwm Llwynau · Torfaen | — | stepped | 1135 m | 70 m | 6.2% | ≈26.8% |
| Cwm Sŷch to Cwm Dyfnant° | near Cwm Sŷch · Powys | — | sustained | 4617 m | 156 m | 3.4% | ≈26.4% |
| Cwm Wern-ddu to Llanfihangel-y-Creuddyn° | near Llanfihangel-y-Creuddyn · Sir Ceredigion - Ceredigion | — | sustained | 1549 m | 98 m | 6.3% | ≈20.1% |
| Cwm y Gâth to Bryn-y-Fedwen° | near Banc y Cwm · Powys | — | sustained | 9334 m | 423 m | 4.5% | 22.6% |
| Cwm-hirblyg to Glyn Llydan° | near Glyn Llydan · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 2890 m | 96 m | 3.3% | ≈26.7% |
| Cwm-hirblyg to Pen Rhiw-Wen° | near Cwm Nant-dywyll · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 5282 m | 272 m | 5.2% | 18.7% |
| Cwrdy Lane | near Penyrheol · Torfaen | — | stepped | 1757 m | 158 m | 9.0% | ≈28.7% |
| Cyffredyn to Blaen Onneu° | near Cwm Cleisfer · Powys | — | sustained | 4794 m | 323 m | 6.7% | 16.2% |
| Dardy to Blaen Onneu° | near Cwm Onnau · Powys | — | sustained | 6272 m | 328 m | 5.2% | ≈23.2% |
| Derwen Lane | near Penrhyn-side · Conwy | — | stepped | 1188 m | 78 m | 6.5% | 27.2% |
| Devil's Staircase | near Coed Nant-yr-hwch · Powys | Another 1003 | sustained | 841 m | 111 m | 13.2% | 24.5% |
| Devil's Staircase (west side) | near Coed Nant-yr-hwch · Powys | tag: 25% (2026) | stepped | 2348 m | 181 m | 7.7% | 22.3% |
| Dinas Oleu Lane | near Abermaw · Gwynedd | — | sustained | 198 m | 43 m | 21.5% | ≈29.4% |
| Discoed to Upper Dunn's Plantation° | near Thorn · Powys | — | stepped | 2144 m | 164 m | 7.7% | ≈26.2% |
| Dolhendre to Carndochan° | near Rhosdylluan · Gwynedd | — | sustained | 642 m | 53 m | 8.3% | ≈26.5% |
| Duffield's Lane | near Upper Redbrook · Sir Fynwy - Monmouthshire | — | sustained | 993 m | 102 m | 10.3% | ≈26.0% |
| Dyffryn Conwy to Mynydd Cauedig° | near Dyffryn Conwy · Conwy | — | sustained | 2486 m | 163 m | 6.6% | ≈26.8% |
| Eisingrug to Moel y Geifr° | near Eisingrug · Gwynedd | — | sustained | 2149 m | 217 m | 10.1% | ≈22.0% |
| Erwyd to Llangynog° | near Cwm Owen · Powys | — | stepped | 9780 m | 271 m | 2.8% | ≈19.5% |
| Felindre to Cwm Hyfryd° | near Cwmpengraig · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 5214 m | 262 m | 5.0% | ≈17.6% |
| Ffordd Bryn Fran | near Pentre'r Felin · Conwy | — | sustained | 2943 m | 292 m | 9.9% | ≈28.1% |
| Ffordd Llwyn Du | near Pentre'r Felin · Conwy | — | sustained | 1494 m | 182 m | 12.2% | 28.3% |
| Ffordd Pen Llech | near Harlech · Gwynedd | Guinness4 | sustained | 237 m | 41 m | 17.2% | ≈32.6% |
| Ffordd Rhiwlas | near Coed y Brain · Conwy | — | stinger | 4196 m | 107 m | 2.6% | ≈26.5% |
| Ffordd y Graig | near Trebannws · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 1632 m | 173 m | 10.6% | ≈26.2% |
| Ffordd-las to Hay Bluff° | near Tregoyd · Powys | — | sustained | 6927 m | 294 m | 4.2% | ≈28.7% |
| Fforest Road | near Caegarw · Rhondda Cynon Taf | — | sustained | 925 m | 115 m | 12.5% | ≈26.8% |
| Garth to Cwmsymlog° | near Pen-rhiw-newydd · Sir Ceredigion - Ceredigion | — | sustained | 4880 m | 273 m | 5.6% | 18.5% |
| Georges Delight | near Gaer-fawr · Sir Fynwy - Monmouthshire | — | stepped | 2215 m | 162 m | 7.3% | ≈26.4% |
| Gladestry to Hengoed° | near Huntington · County of Herefordshire | — | stepped | 2078 m | 94 m | 4.5% | ≈26.5% |
| Glamorgan Street | near Penrhiwceiber · Rhondda Cynon Taf | — | sustained | 1148 m | 113 m | 9.8% | 21.7% |
| Glyndyfrdwy to Moel Morfydd° | near Glyndyfrdwy · Sir Ddinbych - Denbighshire | — | stepped | 3629 m | 279 m | 7.7% | 25.5% |
| Govilon to Gilwern Hill° | near Cwm Llanwenarth · Sir Fynwy - Monmouthshire | — | sustained | 1788 m | 187 m | 10.5% | ≈22.2% |
| Greenfield Place | near Middle Coedcae · Torfaen | — | sustained | 600 m | 48 m | 7.9% | 22.3% |
| Groeslon-waun to Cefn Du° | near Groeslon · Gwynedd | — | stepped | 1714 m | 98 m | 5.7% | 26.2% |
| Gully to Pen y Ffynnon° | near Gully · Powys | — | stepped | 1677 m | 125 m | 7.5% | 27.5% |
| Gwyddelwern to Betws Gwerful Goch° | near Gwyddelwern · Sir Ddinbych - Denbighshire | — | stepped | 4416 m | 59 m | 1.3% | ≈26.2% |
| Hafod Lane | near Trehafod · Rhondda Cynon Taf | — | sustained | 2898 m | 130 m | 4.5% | ≈27.3% |
| Hafod-fan Road | near Six Bells · Blaenau Gwent | — | sustained | 181 m | 31 m | 17.0% | 20.4% |
| Halswell Street | near Tyntetown · Rhondda Cynon Taf | — | sustained | 163 m | 21 m | 12.7% | 20.7% |
| Hardknott Pass | near Harter Fell · Cumberland | 100 Climbs1 | stepped | 4858 m | 138 m | 2.8% | 25.9% |
| Heartsease to Stanage Park° | near Heartsease · Powys | — | sustained | 894 m | 70 m | 7.9% | 20.2% |
| Hen Ffordd | near Bwlch · Powys | — | sustained | 419 m | 40 m | 9.4% | ≈21.0% |
| Hendre Owen Road | near Duffryn · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 309 m | 46 m | 15.0% | 23.1% |
| Henllys to Nant Carn° | near Henllys · Torfaen | — | sustained | 1553 m | 187 m | 12.1% | ≈25.4% |
| Heol Calch | near Cwm Gored · Powys | — | stepped | 925 m | 86 m | 9.3% | ≈26.0% |
| Heol Feurig | near Dolgellau · Gwynedd | — | stepped | 284 m | 33 m | 11.5% | ≈30.0% |
| Heol Lan | near Cwm Nantypistyll · Powys | — | stepped | 3418 m | 120 m | 3.5% | ≈26.3% |
| Heol y Banc | near Llygadywawr · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 1670 m | 164 m | 9.8% | 21.9% |
| High Meadow to Hafodyrynys° | near Cwm Hafod-fach · Caerffili - Caerphilly | — | stepped | 4325 m | 266 m | 6.1% | ≈24.0% |
| Hill Road | near Pontlottyn · Caerffili - Caerphilly | — | stepped | 1187 m | 114 m | 9.6% | 21.6% |
| Hill Street | near Cwm Ysgwydd-gwyn · Caerffili - Caerphilly | — | sustained | 1697 m | 146 m | 8.6% | 27.9% |
| Hillside | near Woodland Park · Sir Ddinbych - Denbighshire | — | stepped | 1437 m | 110 m | 7.7% | 24.6% |
| Horseshoe Pass | near Pentre-dwfr · Sir Ddinbych - Denbighshire | Nat HC 19715 | sustained | 5835 m | 215 m | 3.7% | ≈14.4% |
| Lane near Abercych° | near Abercych · Sir Benfro - Pembrokeshire | — | stepped | 684 m | 73 m | 10.6% | ≈26.3% |
| Lane near Betws-y-coed | near Betws-y-Coed · Conwy | tag: 20% (2026) | sustained | 1263 m | 162 m | 12.8% | ≈21.6% |
| Lane near Blaen-y-Glyn | near Bannau Brycheiniog · Powys | tag: 20% (2026) | sustained | 1515 m | 180 m | 11.8% | ≈19.7% |
| Lane near Blaenllechau° | near Blaenllechau · Rhondda Cynon Taf | — | stepped | 447 m | 30 m | 6.7% | ≈29.4% |
| Lane near Cellan° | near Cellan · Sir Ceredigion - Ceredigion | — | stepped | 2094 m | 124 m | 5.9% | ≈30.1% |
| Lane near Ceunant° | near Ceunant · Powys | — | stepped | 1325 m | 63 m | 4.8% | ≈26.4% |
| Lane near Cwrt | near Cwm Ffernol · Gwynedd | tag: 20% (2026) | sustained | 1015 m | 94 m | 9.2% | 24.4% |
| Lane near Dolgellau° | near Dolgellau · Gwynedd | — | sustained | 234 m | 35 m | 15.1% | 20.3% |
| Lane near Fron° | near Fron · Powys | — | sustained | 492 m | 89 m | 18.1% | ≈29.3% |
| Lane near Garndolbenmaen° | near Garndolbenmaen · Gwynedd | — | stepped | 722 m | 65 m | 9.0% | 20.6% |
| Lane near Gilfach° | near Gilfach · Caerffili - Caerphilly | — | stepped | 352 m | 28 m | 7.8% | 20.7% |
| Lane near Glascoed° | near Glascoed · Powys | — | stepped | 1360 m | 101 m | 7.5% | 25.2% |
| Lane near Glyn Ceiriog° | near Glyn Ceiriog · Wrecsam - Wrexham | — | stepped | 522 m | 60 m | 11.4% | ≈27.2% |
| Lane near Glyn Ceiriog° | near Glyn Ceiriog · Wrecsam - Wrexham | — | sustained | 1051 m | 87 m | 8.3% | ≈27.2% |
| Lane near Kilgwrrwg Common° | near Kilgwrrwg · Sir Fynwy - Monmouthshire | — | stepped | 1472 m | 117 m | 7.9% | ≈27.5% |
| Lane near Leighton | near Pentre · Powys | tag: 20% (2026) | sustained | 646 m | 70 m | 10.9% | ≈22.8% |
| Lane near Llanarmon Mynydd Mawr | near Llanrhaeadr-ym-Mochnant · Powys | tag: 20% (2026) | sustained | 762 m | 85 m | 11.1% | ≈26.8% |
| Lane near Llanddeusant° | near Llanddeusant · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 499 m | 66 m | 13.2% | ≈27.4% |
| Lane near Llanedi° | near Llanedi · Sir Gaerfyrddin - Carmarthenshire | — | stepped | 1275 m | 66 m | 5.2% | 20.3% |
| Lane near Llanfair Talhaearn° | near Llanfair Talhaiarn · Conwy | — | sustained | 1627 m | 141 m | 8.6% | 20.4% |
| Lane near Llangadfan° | near Llangadfan · Powys | — | sustained | 546 m | 56 m | 10.2% | ≈27.3% |
| Lane near Llanglydwen° | near Llanglydwen · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 1839 m | 96 m | 5.2% | 20.3% |
| Lane near Llanybri° | near Llanybri · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 879 m | 93 m | 10.5% | ≈26.4% |
| Lane near Llanystumdwy° | near Llanystumdwy · Gwynedd | — | stepped | 556 m | 36 m | 6.4% | ≈27.0% |
| Lane near Maen-Offeren° | near Maen-Offeren · Gwynedd | — | sustained | 225 m | 29 m | 13.1% | 25.3% |
| Lane near Maenan° | near Maenan · Conwy | — | sustained | 1027 m | 138 m | 13.5% | ≈27.5% |
| Lane near Miskin° | near Miskin · Rhondda Cynon Taf | — | stepped | 752 m | 70 m | 9.3% | 22.0% |
| Lane near Miskin° | near Miskin · Rhondda Cynon Taf | — | sustained | 315 m | 47 m | 14.9% | 21.0% |
| Lane near Pont-Tyweli° | near Pont-Tyweli · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 1898 m | 104 m | 5.5% | ≈23.9% |
| Lane near Price Town° | near Price Town · Pen-y-bont ar Ogwr - Bridgend | — | sustained | 432 m | 46 m | 10.6% | 22.9% |
| Lane near Rhyd-Meirionnydd | near Craig y Delyn · Sir Ceredigion - Ceredigion | tag: 25% (2026) | sustained | 4621 m | 55 m | 1.2% | 13.9% |
| Lane near Stanleytown° | near Stanleytown · Rhondda Cynon Taf | — | sustained | 164 m | 27 m | 16.1% | 28.4% |
| Lane near Stepaside° | near Stepaside · Powys | — | sustained | 1727 m | 112 m | 6.5% | ≈26.3% |
| Lane near Ton Pentre° | near Ton Pentre · Rhondda Cynon Taf | — | sustained | 314 m | 40 m | 12.6% | ≈28.5% |
| Lane near Trealaw° | near Trealaw · Rhondda Cynon Taf | — | stepped | 253 m | 25 m | 9.9% | ≈24.5% |
| Lane near Ty'n-y-groes° | near Ty'n-y-groes · Conwy | — | stepped | 957 m | 48 m | 5.0% | ≈26.2% |
| Lane near Wernffrwd° | near Wernffrwd · Abertawe - Swansea | — | sustained | 1264 m | 81 m | 6.4% | 22.0% |
| Lane near Whitesands Bay° | near Whitesands Bay · Sir Benfro - Pembrokeshire | — | sustained | 610 m | 48 m | 7.9% | 22.1% |
| Lane near Ystradfellte° | near Ystradfellte · Powys | — | stepped | 2317 m | 79 m | 3.4% | 21.0% |
| Lawnt to Tir Mostyn° | near Soar · Sir Ddinbych - Denbighshire | — | sustained | 9367 m | 331 m | 3.5% | 17.9% |
| Lewis Street | near Prospect Place · Torfaen | — | stepped | 1483 m | 87 m | 5.9% | 23.2% |
| Llancowrid to Goetre Hill° | near Cwmberllan Dingle · Powys | — | stepped | 2355 m | 100 m | 4.2% | ≈26.4% |
| Llandderfel to Carnedd Wen° | near Llandderfel · Gwynedd | — | stepped | 2906 m | 221 m | 7.6% | ≈26.4% |
| Llandecwyn to Bryn Bwbach° | near Bryn Bwbach · Gwynedd | — | sustained | 1271 m | 86 m | 6.8% | ≈27.8% |
| Llandeilo Road | near Glanaman · Sir Gaerfyrddin - Carmarthenshire | — | stepped | 2628 m | 129 m | 4.9% | ≈29.8% |
| Llanellen to Cefn y Galchen° | near Llanellen · Sir Fynwy - Monmouthshire | — | sustained | 5964 m | 452 m | 7.6% | ≈21.5% |
| Llanellen to Coed y Prior° | near Llanellen · Sir Fynwy - Monmouthshire | — | sustained | 958 m | 138 m | 14.4% | ≈26.7% |
| Llanfach Road | near Llanfach · Caerffili - Caerphilly | — | sustained | 1737 m | 187 m | 10.8% | ≈20.9% |
| Llanfihangel-y-Creuddyn to Pant-y-crug | near Cwm Seiri · Sir Ceredigion - Ceredigion | — | sustained | 2553 m | 87 m | 3.4% | 25.4% |
| Llangadog to Pentir-bach° | near Llanwrda · Sir Gaerfyrddin - Carmarthenshire | — | stepped | 3534 m | 26 m | 0.7% | ≈26.4% |
| Llangollen to Blaen-Bache Dingle° | near Llangollen · Sir Ddinbych - Denbighshire | — | sustained | 2680 m | 279 m | 10.4% | ≈30.9% |
| Llanguicke Road | near Cwm Siôn · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 1172 m | 156 m | 13.3% | ≈28.7% |
| Llangynidr to Cwm Cleisfer° | near Cwm Cleisfer · Powys | — | sustained | 2044 m | 149 m | 7.3% | ≈27.2% |
| Llangynog to Cwm Pydew° | near Cwm Rhiweirth · Powys | — | sustained | 7377 m | 304 m | 4.1% | ≈11.3% |
| Llanilid to Ruthin° | near Ruthin · Bro Morgannwg - the Vale of Glamorgan | — | stepped | 1616 m | 31 m | 1.9% | ≈12.0% |
| Llanybydder to Mynydd Llanybyther° | near Ceunant Fâch · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 6003 m | 286 m | 4.8% | 15.2% |
| Llawr-y-glyn to Glyntrefnant° | near Llawr-y-glyn · Powys | — | sustained | 1033 m | 131 m | 12.6% | ≈26.7% |
| Llwynmawr to Bedwlwyn° | near Pentre Cilgwyn · Wrecsam - Wrexham | — | sustained | 1808 m | 159 m | 8.8% | 26.1% |
| Lon Bribwll | near Llanbedrog · Gwynedd | — | stepped | 635 m | 40 m | 6.3% | ≈27.2% |
| Lower Harper's Road | near Victoria Village · Torfaen | — | stepped | 1502 m | 114 m | 7.6% | ≈26.1% |
| Lower Stoney Road | near Victoria Village · Torfaen | — | stepped | 623 m | 62 m | 10.0% | ≈26.1% |
| Lôn Nant Stigallt | near Llwyn-hudol · Gwynedd | — | sustained | 917 m | 60 m | 6.5% | ≈27.7% |
| Maesyffynnon Terrace | near Tonypandy · Rhondda Cynon Taf | — | stepped | 364 m | 38 m | 10.5% | 21.8% |
| Melin-y-coed to Pant-y-maes° | near Nant Bwlch-y-gwynt · Conwy | — | sustained | 2452 m | 262 m | 10.7% | ≈30.3% |
| Mount Pleasant Terrace | near Miskin · Rhondda Cynon Taf | — | sustained | 724 m | 62 m | 8.5% | 21.6% |
| Mount Road | near Penrhiw · Caerffili - Caerphilly | — | stepped | 825 m | 95 m | 11.5% | ≈26.5% |
| Mountain Road | near Port Talbot · Castell-nedd Port Talbot - Neath Port Talbot | — | stepped | 514 m | 53 m | 10.4% | ≈31.4% |
| Mountain Road | near Ty-Sign · Caerffili - Caerphilly | — | sustained | 3884 m | 274 m | 7.0% | ≈26.5% |
| Nant-y-Rhiw to Moel Trefriw° | near Nant-y-Rhiw · Conwy | — | sustained | 4096 m | 279 m | 6.8% | ≈25.6% |
| New Mills to Ceunant y Garys° | near New Mills · Powys | — | sustained | 1951 m | 201 m | 10.3% | ≈22.8% |
| Newgale Hill | near Newgale · Sir Benfro - Pembrokeshire | — | sustained | 836 m | 83 m | 9.9% | 21.7% |
| Onen to Pen-y-lan° | near Onen · Sir Fynwy - Monmouthshire | — | sustained | 1489 m | 111 m | 7.5% | ≈27.8% |
| Panorama Walk | near Cwrt · Gwynedd | — | stepped | 1296 m | 89 m | 6.9% | 26.4% |
| Panorama Walk | near Castell Dinas Bran · Sir Ddinbych - Denbighshire | — | sustained | 3264 m | 148 m | 4.5% | ≈28.7% |
| Pant Du | near Vale of Llangollen · Sir Ddinbych - Denbighshire | — | sustained | 825 m | 101 m | 12.3% | ≈29.4% |
| Pant Glâs to Bryn-y-gôg° | near Nasareth · Gwynedd | — | stepped | 2099 m | 43 m | 2.0% | 20.3% |
| Parc Road | near Graig Trewyddfa · Abertawe - Swansea | — | sustained | 413 m | 43 m | 10.3% | 20.8% |
| Parc-Seymour to Castell-prin° | near Parc-Seymour · Casnewydd - Newport | — | stepped | 974 m | 24 m | 2.5% | ≈29.5% |
| Parc-y-rhôs to Mynydd Pencarreg° | near Parc-y-rhôs · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 5901 m | 276 m | 4.7% | ≈19.0% |
| Park Road | near Rhondda Fach · Rhondda Cynon Taf | — | sustained | 899 m | 76 m | 8.5% | 25.8% |
| Park Street | near Cwm Clydach · Rhondda Cynon Taf | — | stepped | 996 m | 76 m | 7.6% | 23.0% |
| Partrishow Hill to Partrishow° | near Partrishow · Powys | — | sustained | 2447 m | 154 m | 6.3% | ≈27.8% |
| Pea Royd Lane | near Stocksbridge | Tour of Britain6 | sustained | 442 m | 68 m | 15.3% | ≈19.2% |
| Pen y Darren to Dinas° | near Cwm Nant-y-glo · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 1800 m | 64 m | 3.5% | 25.3% |
| Pen-y-Ffridd | near Rhiwlas · Gwynedd | — | sustained | 1509 m | 154 m | 10.2% | 17.0% |
| Pen-y-lan to Llangattock Vibon Avel° | near Newcastle · Sir Fynwy - Monmouthshire | — | stepped | 1840 m | 51 m | 2.8% | ≈26.5% |
| Pendine Hill | near Pendine · Sir Gaerfyrddin - Carmarthenshire | tag: 20% (2026) | sustained | 863 m | 88 m | 10.2% | 19.6% |
| Penglais Hill | near Buarth Mawr · Sir Ceredigion - Ceredigion | sign: 11% | sustained | 1310 m | 97 m | 7.4% | 11.2% |
| Pentre-dwfr to Moel y Faen° | near Pentre-dwfr · Sir Ddinbych - Denbighshire | — | sustained | 1957 m | 216 m | 11.0% | 21.1% |
| Penygraig Terrace | near Ynysybwl · Rhondda Cynon Taf | — | sustained | 445 m | 46 m | 10.4% | 20.3% |
| Penygraigwen to Llanwonno° | near Cwm Hafod · Rhondda Cynon Taf | — | sustained | 7613 m | 265 m | 3.5% | 18.8% |
| Ponthir Road | near Caerllion · Casnewydd - Newport | tag: 20% (2026) | sustained | 242 m | 17 m | 7.0% | 12.4% |
| Pontrobert to Llanfihangel-yng-Ngwynfa° | near Cwm Einion · Powys | — | stepped | 5432 m | 172 m | 3.2% | ≈26.1% |
| Pound Lane | near Llwynderw · Powys | — | sustained | 1461 m | 154 m | 10.5% | ≈29.2% |
| Prenol to Pont Bronferiaeth° | near The Dell · Conwy | — | stepped | 2442 m | 128 m | 5.2% | ≈26.7% |
| Primrose Hill | near Pwllhobi · Sir Ceredigion - Ceredigion | tag: 12% (2026) | sustained | 310 m | 28 m | 9.0% | 14.7% |
| Rhigos Road | near Tynewydd · Rhondda Cynon Taf | 100 Climbs1 | sustained | 6004 m | 305 m | 5.1% | 8.6% |
| Rhiw Fain | near Cwm Perlla · Sir Ceredigion - Ceredigion | — | sustained | 1176 m | 132 m | 11.2% | 22.2% |
| Rhiw Syr Dafydd | near Rock · Caerffili - Caerphilly | — | sustained | 125 m | 26 m | 20.6% | ≈29.6% |
| Rhyd to Llandygwydd° | near Rhyd · Sir Ceredigion - Ceredigion | — | stinger | 2466 m | 29 m | 1.2% | ≈29.1% |
| Rhyd-y-foel to Coed Bettws° | near Rhyd-y-foel · Conwy | — | stepped | 2048 m | 119 m | 5.8% | ≈27.5% |
| Rhyd-y-gwin to Tor Clawdd° | near Cwm Clydach · Abertawe - Swansea | — | sustained | 3579 m | 196 m | 5.5% | ≈28.8% |
| Rhyd-y-saint to Bryn-têg° | near Rhyd-y-saint · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 1531 m | 52 m | 3.4% | 23.9% |
| Risca to Cwm Byr° | near Risca · Caerffili - Caerphilly | — | sustained | 1122 m | 122 m | 10.9% | ≈29.0% |
| Roman Reach | near St Julians · Casnewydd - Newport | tag: 20% (2026) | sustained | 396 m | 20 m | 5.1% | 10.1% |
| Roman Way | near Caerllion · Casnewydd - Newport | tag: 30% (2026) | sustained | 566 m | 22 m | 3.8% | 12.1% |
| Rosedale Chimney Bank | near Rosedale Abbey · North Yorkshire | 100 Climbs1 | sustained | 1107 m | 149 m | 13.4% | 26.6% |
| Route Des Alpes | near Cwmllwydrew · Caerdydd - Cardiff | — | stepped | 2392 m | 136 m | 5.7% | ≈31.0% |
| Sarn Mellteyrn to Mynydd Rhiw° | near Sarn Mellteyrn · Gwynedd | — | sustained | 1793 m | 151 m | 8.4% | 21.4% |
| School Street | near Maerdy · Rhondda Cynon Taf | — | sustained | 497 m | 53 m | 10.7% | 20.1% |
| Sennybridge to Yr Allt° | near Cwm Clydach · Powys | — | sustained | 1412 m | 56 m | 3.9% | ≈29.5% |
| Soar Road | near Talsarnau · Gwynedd | tag: 20% (2026) | sustained | 396 m | 48 m | 12.0% | ≈21.5% |
| Springfield Road | near Maerdy · Rhondda Cynon Taf | — | sustained | 410 m | 29 m | 7.2% | 20.0% |
| Station Road | near Clydach · Sir Fynwy - Monmouthshire | — | sustained | 1988 m | 221 m | 11.1% | ≈26.4% |
| Strada Florida Trailhead (Southernmost) to Pen y Cnwc° | near Coed Nant-yr-hwch · Powys | — | stepped | 2113 m | 160 m | 7.6% | 22.3% |
| Sunny Bank | near Aberhonddu · Powys | — | sustained | 451 m | 39 m | 8.6% | 23.1% |
| Swansea Road | near Cwm Ffrwd · Rhondda Cynon Taf | — | sustained | 1920 m | 68 m | 3.6% | 22.3% |
| Tal-y-bont to Pen-y-gaer° | near Llanbedr-y-cennin · Conwy | — | sustained | 3381 m | 335 m | 9.9% | 23.6% |
| Tan Yr Allt Avenue | near Mochdre · Conwy | — | stepped | 611 m | 58 m | 9.5% | 23.0% |
| The Conduit | near Trefaldwyn · Powys | — | stepped | 743 m | 72 m | 9.6% | 27.5% |
| The Hendre to Pen-y-lan° | near The Hendre · Sir Fynwy - Monmouthshire | — | sustained | 2447 m | 102 m | 4.2% | ≈26.5% |
| The Struggle (Kirkstone Road) | near Ambleside · Westmorland and Furness | 100 Climbs1 | sustained | 1287 m | 157 m | 12.2% | 23.2% |
| Trallong to Cwm Brynych° | near Cwm Camlais-fach · Powys | — | sustained | 4833 m | 160 m | 3.3% | 24.7% |
| Tredegar Avenue | near Llanharan · Rhondda Cynon Taf | tag: 20% (2026) | sustained | 228 m | 21 m | 9.4% | 16.6% |
| Trefriw to Llanrhychwyn° | near Llanrhychwyn · Conwy | — | sustained | 2093 m | 201 m | 9.6% | ≈26.9% |
| Treharris Mountain Road | near Treharris · Merthyr Tudful - Merthyr Tydfil | — | sustained | 3562 m | 240 m | 6.7% | 22.0% |
| Trinity View | near Pilton Vale · Casnewydd - Newport | tag: 40% (2026) | sustained | 602 m | 80 m | 13.3% | ≈22.9% |
| Troed-y-Rhiw Road | near Ynysddu · Caerffili - Caerphilly | — | stepped | 3156 m | 201 m | 6.4% | ≈26.3% |
| Twtil | near Harlech · Gwynedd | sign: 25% (2026) | sustained | 352 m | 50 m | 14.1% | 21.5% |
| Twyn Gof Common to Cwm Dyfnant° | near Cwm Dyfnant · Powys | — | sustained | 2933 m | 200 m | 6.8% | ≈26.4% |
| Ty Canol Lane | near Machen · Caerffili - Caerphilly | — | sustained | 2033 m | 210 m | 10.3% | 18.9% |
| Ty Gwyn Road | near Cwlach · Conwy | tag: 20% (2026) | sustained | 841 m | 96 m | 11.4% | 19.4% |
| Tylwch to Brynposteg Hill° | near Cwm Jonathan · Powys | — | sustained | 4281 m | 103 m | 2.4% | 20.0% |
| Tylwch to Oldchapel Hill° | near Cwm Fron · Powys | — | stepped | 2298 m | 113 m | 4.9% | 23.8% |
| Unnamed lane near Llanfihangel-y-Creuddyn | near Cnwch Coch · Sir Ceredigion - Ceredigion | — | stepped | 1394 m | 89 m | 6.4% | ≈27.1% |
| Vine Row | near Ystalyfera · Castell-nedd Port Talbot - Neath Port Talbot | — | sustained | 667 m | 82 m | 12.3% | ≈28.5% |
| Welsh Harp Hollow | near Cwm y Sul · Powys | — | sustained | 3695 m | 304 m | 8.2% | 23.1% |
| Wenallt to Cwm Grognant° | near Cwm Grognant · Sir Ceredigion - Ceredigion | — | sustained | 1088 m | 86 m | 7.9% | ≈20.1% |
| Windsor Road | near Six Bells · Blaenau Gwent | — | sustained | 448 m | 40 m | 9.0% | 20.4% |
| Wood Street | near Maerdy · Rhondda Cynon Taf | — | sustained | 245 m | 29 m | 12.0% | 20.0% |
| Woodland Park Road | near Beechwood · Casnewydd - Newport | — | sustained | 808 m | 60 m | 7.4% | 23.7% |
| Wrynose Pass | near Green Crag · Westmorland and Furness | 100 Climbs1 | sustained | 1028 m | 108 m | 10.5% | 24.6% |
| Yr Allt | near Allt · Sir Gaerfyrddin - Carmarthenshire | — | stepped | 655 m | 50 m | 7.7% | ≈27.8% |
| Yr Allt | near Allt · Sir Gaerfyrddin - Carmarthenshire | — | sustained | 562 m | 51 m | 9.0% | ≈27.8% |
Sources: 1 100 Greatest Cycling Climbs (Simon Warren) · 2 Wikipedia · 3 Another 100 Greatest Cycling Climbs (Simon Warren) · 4 Guinness World Records · 5 British National Hill Climb Championship · 6 Tour of Britain