Skip to content

Home / Races / 100 mile

100 mile races in the UK

The classic British hundred. Many sell out or ballot, and several need a qualifying finish before you can even enter. Sorted by when entry opens, not when the race is run.

Terrain

Trail Fell Mountain Moorland Coastal path Forest Canal & towpath Road

Hilliness

Flat Rolling Hilly Mountainous

Format

Single stage Stage Timed Backyard

Entry mechanism

First come first served Ballot Qualifying standard Invitational

Field size

Under 50 50 to 149 150 to 399 400 to 999 1,000+

Specific month

January February March April May June July August September October November December

Other

Dates confirmed by organiser Part of a series

Clear all filters

4 events · 13 races

Dragon's Back Race

Conwy Castle · Eryri / Snowdonia

7 Sept 2026 to 12 Sept

380km over 6 days · Choose your own, roughly half of each day · 137km over 2 days · 110km over 2 days16,600mMountainousMountain, Fell150 to 399 runnersFirst come first servedEntry open

Entry details confirmed with the organiser on 15 August 2026.

The Copthorne Races

Mickleham Village Hall, Mickleham, Dorking RH5 6EE · North Downs

6,888mMountainousTrailFirst come first servedDate unknown

Entry details confirmed with the organiser on 15 August 2026.

Butcombe Trail Ultra

Mendip Activity Centre, BS25 5PQ · South West

1,960mHillyTrail50 to 149 runnersQualifying standardQualifierDate unknown

Entry details confirmed with the organiser on 15 August 2026.

The Montane Lakeland 50 & 100

Coniston · Lake District

23 Jul 2027 to 25 Jul

105 miles · 50 miles6,856mMountainousFell, Mountain400 to 999 runnersBallotQualifierBallot opens in 17d

Entry details confirmed with the organiser on 14 August 2026.