Autumn 100

Q: How flat is the Autumn 100 compared to other 100-mile races? A: Extremely flat. The Autumn 100 covers 161km with approximately 1,500m of total gain — 9.3m per kilometre — ranking 372nd of 383 measured courses in the DTR database by elevation density. Only 11 courses in the database have less gain per km. The average uphill gradient is 4.64% (371st of 390 measured) — virtually all climbing is runnable. 69.8% of the course is flat terrain. [DTR: D+-Per-KM-Ranking 372/383; DTR: Average-Upill-Gradient-WD-Ranking 371/390]

Q: What is the Autumn 100 course format? A: Four 25-mile out-and-back spurs, all starting and finishing at Goring Village Hall race HQ in Oxfordshire. Legs 1 and 4 follow the Thames Path (flat, riverside). Legs 2 and 3 climb onto the Ridgeway National Trail (hillier, ancient woodland). The format means crews can support at HQ after each 25-mile leg — four access points across the race.

Q: How much does the Autumn 100 cost? A: £220 for UKA-affiliated runners (£222 unaffiliated) — £1.57 per kilometre for a professionally organised 100-mile race with 16 aid stations, full medical support, and course markings throughout.

Q: Does the Autumn 100 sell out? A: It has sold out in previous years (2017 and 2023 confirmed). As of the research date, the 2026 edition opened November 2025 and was not sold out. No waitlist and no on-the-day entries are offered once the race fills. Registration is first-come, first-served.