Hertfordshire
Ultra marathons in Hertfordshire
There are 5 ultra marathons in Hertfordshire on the Verus calendar, running across 5 months of the year. The next is Chiltern Ridge Winter 50K on 31 October 2026. Every entry below links to the organiser's own site, and the fuller guides are researched by hand against it — dates, entry costs, start times and course detail.
- Races listed
- 5
- Still upcoming
- 4
- Flattest course
- Chiltern Ridge Classic 50K
Ultra Marathons in Hertfordshire, in context
Verus covers 5 ultra marathons in Hertfordshire, out of 30 races there — roughly 17% of what is on here.
The dates are spread across 5 months of the year, which gives real choice about when to peak rather than forcing a single date.
Only one of them publishes an elevation figure: Chiltern Ridge Classic 50K, at 3,268ft of climb. Where an organiser has not published one, this site says so rather than estimating.
Every one of them, in date order
St Albans Stampede 12 Hour
Heartwood Forest and Nomansland Common, Hertfordshire, UK
Chiltern Ridge Winter 50K
The Chiltern ridge, Hertfordshire and Buckinghamshire, UK
North Chilterns 50K
North Hertfordshire, UK
London Lea Valley 50K
The Lea Valley, London and Hertfordshire, UK
Chiltern Ridge Classic 50K
Berkhamsted to Wendover, along the Chiltern ridge, UK
Dates and entry at a glance
| Race | Date | Location | Entry |
|---|---|---|---|
| St Albans Stampede 12 Hour | 5 Sept 2026 | Heartwood Forest and Nomansland Common, Hertfordshire, UK | Entry through Active Training World or Eventrac |
| Chiltern Ridge Winter 50K | 31 Oct 2026 | The Chiltern ridge, Hertfordshire and Buckinghamshire, UK | Entry through Runaway Racing — check the official site for current pricing |
| North Chilterns 50K | 21 Nov 2026 | North Hertfordshire, UK | Entry through Runaway Racing — check the official site for current pricing |
| London Lea Valley 50K | 20 Mar 2027 | The Lea Valley, London and Hertfordshire, UK | Entry through Camino Ultra |
| Chiltern Ridge Classic 50K | 17 Apr 2027 | Berkhamsted to Wendover, along the Chiltern ridge, UK | £60, or £62 for unaffiliated runners |
Other distances in Hertfordshire
Also racing in Hertfordshire
Smaller local races we've indexed but not written a full guide for. We link straight to the organiser rather than keeping you here — there's nothing we could tell you about these that they don't tell you better.
Athletes from Hertfordshire on Verus
Everyone here has set out what they're training for, in public. Find someone from your own town chasing the same start line.