Ultra runs in Hertfordshire
Find ultra runs in Hertfordshire in 2025/2026 - 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.
- Sun 26 Oct
- £55
Stort30
A stunningly pretty 30-mile out-and-back ultra on the border of Hertfordshire and Essex along the River Stort and Lee navigation. A great first foray into ultra running or a fast competitive race.
- Newcomers
- Chip timing
- Enter online
- Flat
- Event village
- Rural
- Age 18 & over
- 30 miles trail running + 188 ft ascent
- Sat 1 Nov
- £23-£37.50
Catherine Wheel Canter
Welcome to the Fireworks Festival of Running! Come and tackle the track to see how far you can go in 6 hours, whether you reach 5K or an ultra, over the 400m circuit.
- Newcomers
- Music
- Event village
- Park
- Age 16 & over
- 5K run
- 10K run
- Half marathon
- Marathon
- 50K ultra run
- + 1 more race
- Sat 1 Nov
- £23-£37.50
Guy Fawkes Gallop
Welcome to the Fireworks Festival of Running! Come and tackle the track to see how far you can go in 6 hours, whether you reach 5K or an ultra, over the 400m circuit.
- Newcomers
- Music
- Event village
- Park
- Age 16 & over
- 5K run
- 10K run
- Half marathon
- Marathon
- 50K ultra run
- + 1 more race
- Sat 1 Nov
- £55.50-£57.50
Rocket Around the Running Track
Welcome to the Fireworks Festival of Running! Come and tackle the 400 metre athletics track for 12 hours and see how far you can go!
- Newcomers
- Music
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Event village
- Park
- Age 21 & over
- 12 hrs track and field
- Sat 1 Nov
- £55.50-£57.50
Fireworks 50
Welcome to the Fireworks Festival of Running! Come and tackle the 400 metre athletics track for the festival's ultimate goal of 50 miles in 12 hours! Have you got what it takes?
- Newcomers
- Music
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Event village
- Park
- Age 21 & over
- 50 miles track and field
- Sat 23 - Sun 24 May 2026
- £33-£165
Farmmageddon
Can you survive Farmmageddon? You have 32 hours to complete 100 miles over a fantastic 5.3K loop through the lovely grounds of Hyde Hall Farm. 24-hour or shorter distance options too.
- Newcomers
- Event village
- Rural
- Age 18 & over
- 5K run
- 10K run
- Half marathon
- Marathon
- Ultra run 2
- + 2 more races
- Sat 27 Jun 2026
- £33-£35
Cock-a-doodle Dawdle | Ultra Marathon
Join like-minded runners doing different distances, starting from the base camp of Hyde Hall Farm and encompassing the beautiful grounds around it over a lovely looped ultra trail route.
- Enter online
- Undulating
- Age 18 & over
- 32 miles trail running + 164 ft ascent
- Sat 1 Nov
Chiltern Ridge Winter 50K
- 50 km trail running + 800 m ascent