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Race	Difficulty Score	Distance	Elevation	Month	Compare Races	Race Website
ARC of Attrition 50 Miles by UTMB Ultra Marathon Race in January near Cornwall	181.41	80.00km	2544metres	January	Compare this race	Sign up to race
Blacks to the Beacons 50 Miles Ultra Marathon Race in May near South Wales	182.86	82.00km	3156metres	May	Compare this race	Sign up to this race
UTMB TDS 145km Ultra Trail du Mont Blanc Ultra Marathon Race in August	347.38	149.00km	9208metres	August	Compare this race	Sign up to race
Vale Coastal 52km Ultra Marathon Race in April Near Cardiff	87.79	52.00km	879metres	April	Compare this race	Sign up to race
The Dragons Back 380km Multi Stage Ultra Marathon Race Through Wales in September	691.39	373.00km	17029metres	September	Compare this race	Sign up to race
The Community Traverse 290km Multi Day Ultra Marathon Race in March near Lake District		288.00km	77613metres	March	Compare this race	Sign up to race
GB Ultras Snowdon 100 Mile Ultra Marathon Race in September Near Snowdonia	298.43	160.00km	6253metres	September	Compare this race	Sign up to this race
Brecon to Cardiff Classic 45 Mile Ultra Marathon Race in February near South Wales	114.40	69.00km	890metres	February	Compare this race	Sign up to race
Run Through Trails Snowdonia Sea2Sky 53K Ultra Marathon in August Near Barmouth	129.32	53.00km	1742metres	August	Compare this race	Sign up to race
Runningmonk Rollin 100 Mile Ultra Marathon in July near Bishops Castle		159.00km	4673metres	July	Compare this race	Sign up to race
Severn Challenge 218 Mile Multi-Stage Ultra Race in May near Aberystwyth	395.74	335.00km	2924metres	May	Compare this race	Sign up to race
Cairngorms Ultra Trail 58km Ultra Marathon in June near Cairngorms National Park	112.05	58.00km	975metres	June	Compare this race	Sign up to race
Ultra-Trail Snowdonia UTS 100KM by UTMB Ultra Marathon Race in May 2026 near Llanberis		98.00km	4633metres	May	Compare this race	Sign up to race
Endurance Life Pembrokeshire 35 Mile Ultra Marathon Race in April near Little Haven	104.80	55.00km	1180metres	April	Compare this race	Sign up to race
Pegasus The Eddum 50 Mile Ultra Marathon Race in August near Epynt Way	159.43	80.00km	2353metres	August	Compare this race	Sign up to race
The Winter Spine Race 268 Mile Non Stop Ultra Marathon Race near Pennine Way in January	644.71	418.00km	11628metres	January	Compare this race	Sign up to race
Out Fit Brenig Way 50K Ultra Trail Race in October near Corwen	116.07	50.00km	1417metres	October	Compare this race	Sign up to race
Hardmoors 200 Miles Ultra Marathon Race near North York Moors in May	442.93	310.00km	7494metres	May	Compare this race	Sign up to race
Cape Wrath 370km Multi-Stage Ultra Marathon Race in May near Highlands of Scotland	575.12	370.00km	11822metres	May	Compare this race	Sign up to race
UTMB CCC 100K Ultra Marathon du Mont Blanc Race in August near Chamonix	252.20	96.00km	6100metres	August	Compare this race	Sign up to race
GB Ultras Race Across Scotland 352km Ultra Marathon Race in August Near Ayrshire	508.58	352.00km	8798metres	August	Compare this race	Sign up to race
Pegasus HOWUM 30 Mile Ultra Marathon Race in Mid Wales in May	113.02	48.00km	1302metres	May	Compare this race	Sign up to race
Ring o'Fire 130 a 212km Non-Stop Ultra Marathon in September near Anglesey	287.64	211.00km	3444metres	August	Compare this race	Sign up to this race
Apex Running 14 Peaks Ultra Welsh 3000s Ultra Marathon in August near Eryri Snowdonia	205.70	51.90km	3730metres	August	Compare this race	Sign up to race
Western States 100 Mile by UTMB Ultra Marathon Race in June	291.20	160.00km	6240metres	June	Compare this race	Sign up to race
Endurancelife Gower 35 Mile Ultra Marathon Race in South Wales in November	109.88	55.00km	1208metres	November	Compare this race	Sign up to race
Gower Ultra 50 Miles Ultra Marathon Race in October Near Gower Peninsula AONB	125.19	81.00km	1519metres	October	Compare this race	Sign up to race
UTMB PTL 300km Ultra Trail du Mont Blanc Ultra Marathon Race in August near Chamonix	692.41	290.00km	24911metres	August	Compare this race	Sign up to race
GB Ultras Snowdon Ultra 50 Mile Ultra Marathon Race in September near Betws Y Coed	173.78	71.00km	3308metres	September	Compare this race	Sign up to race
The CANUM 40 Mile Ultra Marathon Race in April Near Brecon	101.63	64.00km	504metres	April	Compare this race	Sign up to this race
Pegasus VOGUM 40 Mile Ultra Marathon Race in June	98.25	64.00km	825metres	June	Compare this race	Sign up to race
Run Walk Crawl Gower Bach 54km Ultra Marathon Race in October near Gower Peninsula	96.97	54.00km	1197metres	October	Compare this race	Sign up to race
Run Walk Crawl The Dragon 50 Mile Ultra Marathon in South Wales in July	121.49	79.00km	1041metres	July	Compare this race	Sign up to race
Beyond Marathon King Offas Dyke 290km Multi Day Ultra Marathon Race in August in Wales	468.60	268.00km	8923metres	August	Compare this race	Sign up to race
EPONA 100 Mile Ultra Marathon in June near Bannau Brycheiniog South Wales	289.98	161.00km	5408metres	June	Compare this race	Sign up to race
UTMB OCC 54km Ultra Trail du Mont Blanc Ultra Marathon Race in August near Chamonix	180.78	54.00km	3538metres	August	Compare this race	Sign up to race
West Highland Way 152km Ultra Marathon Race near Fort William	251.15	153.00km	3776metres	June	Compare this race	Sign up to race
Beacons Way Ultra 100 Mile Ultra Marathon Race by GB Ultras in July	297.92	158.00km	6324metres	July	Compare this race	Sign up to race
Ultra X Wales 110km Multi Stage Ultra Marathon Race in August near Snowdonia Eryri	224.85	111.00km	4295metres	July	Compare this race	Sign up to race
UTS 50K Ultra-Trail Snowdonia by UTMB Ultra Marathon Race in May near Snowdonia	176.24	49.00km	3384metres	May	Compare this race	Sign up to race
Apex Running Slate Trail Ultra 145km Ultra Marathon Race in October near Snowdonia	245.92	145.00km	3892metres	October	Compare this race	Sign up to race
Endurance Life South Devon 33 Miles Ultra Marathon Race in February near Devon	125.55	54.00km	1785metres	February	Compare this race	Sign up to race
Apex Running Ultra Tour of the Quarries 87km Ultra Marathon in October Near Bangor	177.39	87.00km	2829metres	October	Compare this race	Sign up to race
The Ridum 30 Mile Ultra Marathon Race in September	111.29	50.00km	1299metres	September	Compare this race	Sign up to race
The Dragon 100 Ultra Marathon in South Wales in July near The Gower	226.47	160.00km	2807metres	July	Compare this race	Sign up to this race
Run Walk Crawl 100 Mile Pembrokeshire Coast Path Ultra Marathon Race in June	266.90	160.00km	5520metres	June	Compare this race	Sign up to race
Ultra-Trail Snowdonia UTS 100KM by UTMB Ultra Marathon Race in May 2025 near Llanberis		102.00km	6494metres	May	Compare this race	Sign up to race
UTS 100M Ultra-Trail Snowdonia by UTMB 100 Mile Ultra Marathon Race in May near Llanberis	364.25	160.00km	9795metres	May	Compare this race	Sign up to this race
13 Valleys 180km Ultra Marathon near The Lake District in September	328.80	181.00km	7041metres	September	Compare this race	Sign up to race
ARC of Attrition 100 Miles by UTMB Ultra Marathon Race in January near Cornwall	265.08	161.00km	5138metres	January	Compare this race	Sign up to this race
The Lap 74km Ultra Marathon Around Lake Windermere in May and September in the Lake District		74.00km	2543metres	September, May	Compare this race	Sign up to race
GB Ultras Ultra Wales 50 Mile Ultra Marathon Race in June near Dolgellau	184.69	82.00km	3289metres	June	Compare this race	Sign up to race
Two Moors Way Devon 100km Ultra Marathon Race by Climb South West in May near Changford	181.38	103.00km	2558metres	May	Compare this race	Sign up to race
Maverick Adidas Terrex X-Series Exmoor 58km Ultra Marathon Race in May near Devon	157.66	55.00km	2449metres	May	Compare this race	Sign up to race
Run Walk Crawl 50 Mile Pembrokeshire Coast Path Ultra Marathon Race in June	145.46	79.00km	2447metres	June	Compare this race	Sign up to race
Ultra Scotland® 50 Mile Ultra Marathon Race in June near Southern Upland Way	184.17	90.00km	2757metres	June	Compare this race	Sign up to race
Beacons Way Ultra 100km Race in July near Brecon Beacons	202.69	98.00km	3679metres	July	Compare this race	Sign up to this race
Always Aim High 57km Snowdonia Ultra Marathon Race in July near Snowdonia		56.00km	2186metres	July	Compare this race	Sign up to race
Lakeland 100 Mile Ultra Marathon Race in July near Lake District	307.69	164.00km	6479metres	July	Compare this race	Sign up to race
UTMB 170km Ultra Trail du Mont Blanc Ultra Marathon Race in August	373.47	170.00km	10107metres	August	Compare this race	Sign up to race
Run Walk Crawl 50km Pembrokeshire Coast Path Ultra Marathon Race in June	99.45	50.90km	1354metres	June	Compare this race	Sign up to race
Run Walk Crawl 55km Winter Celtic Ultra Marathon Race in December Near Swansea	117.30	55.00km	1522metres	December	Compare this race	Sign up to race
Firelighter 35 Mile Ultra Marathon Race in September	95.68	54.00km	868metres	September	Compare this race	Sign up to race
Narberth Nobblers The Marreg 76km Ultra Marathon in April Near Pembrokeshire		76.00km	2142metres	April	Compare this race	Sign up to race
South Wales 200 by Wild Horse Ultra Marathon in April near Brecon Beacons	510.61	320.00km	9171metres	May	Compare this race	Sign up to this race
Calon Lân 300 Mile Multi Day Ultra-Marathon Race in July Down the Length of Wales		477.00km	20618metres	July	Compare this race	Sign up to race
Preseli UltraBeast 51KM Ultra Marathon Trail Running Race in May near Pembrokeshire	117.31	51.00km	1701metres	May	Compare this race	Sign up to race
Coast to Coast Winter 59K Ultra Marathon Race in November near Llyn Peninsula	114.40	59.00km	1450metres	November	Compare this race	Sign up to race

🏃 Course Basics & Intensity

Distance: The total length of the race in kilometers or miles.
Elevation per KM: The average vertical gain every kilometer; higher numbers mean steeper races.
Kilometer Effort: The "real-feel" distance combining flat length and vertical climbing into one effort metric.
Difficulty Score: A unique rating calculated from distance, ascent, and terrain technicality.
DNF Rate: The percentage of runners who historically do not finish the race.
Ground Type: Defines the surface, such as hard-packed trail, technical mountain rock, or bog.

⛰️ Climbing & Peaks

Categorised Climbs: The total number of significant, sustained uphill sections on the course.
Avg/Max Altitude: The average and peak heights above sea level you will reach during the race.
Uphill/Downhill %: The percentage of the course spent climbing, descending, or running on flat ground.
Steepest Hill: The maximum gradient percentage you will encounter on the toughest climb.
Cat Biggest Climb: The length and total vertical gain of the single largest climb in the race.

⏱️ Logistics & Timing

Finish Cut-Off: The total time allowed to reach the finish line before being disqualified.
Pace to Finish: The minimum speed (km/h) required to beat the cut-offs, including aid station stops.
Start Time: Whether the race begins in the morning, evening, or at night.
Time of Day: Indicates if you will be running through the day, the night, or both.
Trajectory: Defines if the race is a single loop, a point-to-point, or an out-and-back route.

⛺ Support & Entry

Checkpoints: The total number of aid stations and the average distance between them.
Support Types: Details if the race is self-supported or provides water, food, and medical aid.
Navigation Type: Whether the course is fully marked with flags or requires map-and-compass skills.
UTMB Stones: The number of qualifying stones awarded for entry into the UTMB World Series Finals.
Entry Fee per KM: The total cost of the race divided by its distance for easy price comparison.

🌲 Environment & Beauty

Beauty Spot Rating: A star rating based on the scenic landmarks and views along the route.
Mountain Ranges: The specific mountain groups the race traverses (e.g., Eryri, Glyderau).
Wilderness %: The proportion of the course that takes place in wild, unmanaged natural habitats.
Avg Temp: The typical temperature expected during the month the race is held.