There are 5 upcoming ultra races in Hertfordshire listed. Next up: Stort30 (Sunday, 25 October 2026), Chiltern Ridge Winter 50K (Saturday, 31 October 2026), Halloween Hobble: 5K,10K, HALF MARATHON, FULL MARATHON & ULTRA-MARATHON (Saturday, 31 October 2026).
Upcoming races only, soonest first. Confirm dates and entry details with the organiser.
Bishop's Stortford · Hockerill Sports and Social Club, Beldams Lane, Bishops Stortford, CM23 5LG
A 30-mile out-and-back ultra along the River Stort and Lee navigations from Bishop’s Stortford. The 2026 race starts at 08:30 on 25 October, with an eight-hour limit. The £55 headline fee is for this edition; the separately advertised 2027 ticket is excluded.
£55
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Berkhamsted · Berkhamsted, England, United Kingdom
Chiltern Ridge Winter 50K is organised by Runaway Racing in Berkhamsted. Entry options: 50K Ultra.
£75
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Ware · Wodson Park Sports Centre, Ware, Herts, SG12 0UQ
Halloween Hobble: 5K,10K, HALF MARATHON, FULL MARATHON & ULTRA-MARATHON is organised by Zig Zag Running in Ware. Entry options: Bespoke Event Medal - 10k - 9am; Bespoke Event Medal - 12 Hours - 9am; Bespoke Event Medal - 50 Miles - 9am; Bespoke Event Medal - 5k - 9am; Bespoke Event Medal - 6 hours - 9am; Bespoke Event Medal - Full Marathon - 9am; Bespoke Event Medal - Half Marathon - 9am; Bespoke Event Medal - Ultra Marathon - 9am; Bespoke Event Medal - 10k - 3pm; Bespoke Event Medal - 5k - 3pm; Bespoke Event Medal - Full Marathon - 3pm; Bespoke Event Medal - Half Marathon - 3pm.
£32–£65
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Berkhamsted · Whitehill, Berkhamsted, HP4 1, United Kingdom
Chiltern Ridge Classic 50K is organised by Runaway Racing in Berkhamsted. Entry options: 50K Race Entry.
£73.50
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Ware · Wodson Park Sports Centre, Ware, Herts, SG12 0UQ
Circuit Du Sore Legs is organised by Zig Zag Running in Ware. Entry options: Bespoke Event Medal - 10k; Bespoke Event Medal - 5k; Bespoke Event Medal - 6 hours; Bespoke Event Medal - Full Marathon; Bespoke Event Medal - Half Marathon; Bespoke Event Medal - Ultra Marathon.
£32–£38
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