100K ultra runs in UK in Summer
Find 100k ultra runs in UK in Summer - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
Filter by date
Filter by place
MapEvent listings
Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- Sat 6 - Sun 7 Jun 2026
- £39-£199
Lake District Ultra Challenge
Take on England’s finest countryside at your own pace with stunning views all the way, featuring the Garburn Pass, historic Ambleside, a halfway point by Lake Windermere, forests and nature reserves.
- Families
- Newcomers
- Entertainment
- Music
- Enter online
- Fundraising required
- Event village
- Urban
- Rural
- Age 14 & over
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Sat 20 - Sun 21 Jun 2026
- £49-£199
North Yorks Ultra Challenge
Set to be one of the greatest Ultra Challenges – basecamp is in Scarborough – famous for its Fair, and a popular seaside spa since the 17th century.
- Newcomers
- Event village
- Age 16 & over
- 100K ultra run 2
- 50K ultra run 2
- Trail run
- 10 miler
- Sat 20 Jun 2026
- £175
- 3 charities
Race to the King | 100K Non-Stop
The full circuit takes in both the Coastal and Castle loops for a magnificent tour of the stunning South Downs. Steeped in history and uniquely varied, the 100K offers a course truly fit for royalty.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 1510 m ascent
- Sat 11 - Sun 12 Jul 2026
- £90-£275
Race to the Stones
Conquer Britain's oldest trail, the ancient Ridgeway, as you race towards the 5000-year-old Avebury Standing Stones.
- Families
- Recycling
- Newcomers
- Event village
- Rural
- Sustainability policy
- Public transport links
- Age 18 & over
- 50K ultra run 2
- 100K ultra run 3
- Sat 11 - Sun 12 Jul 2026
Black Diamond Yr Wyddfa Snowdon24
- 24 hrs trail running + 3182 ft ascent
- Sat 20 Jun 2026
Two Rose Ultra | Two Roses Ultra - 100K
- 100 km multi terrain running + 5175 ft ascent
- Fri 3 - Sat 4 Jul 2026
The Full Essex Way Ultra
- 82 miles trail running + 3469 ft ascent