Two Chiltern loops from historic Stonor Park to open the Centurion season
Other trail races within 58 miles
A 50 km trail ultra in the Chiltern Hills, run as two different loops of about 25 km that both start and end at Stonor Park, a country estate near Henley-on-Thames that has been home to the same family for more than 850 years. The route climbs in and out of steep-sided wooded valleys, through beech woods and farmland and past small villages such as Ibstone, Skirmett, Hambleden and Bix, for roughly 1,200 m (4,000 ft) of climbing in short, repeated hills. About 80% is on footpaths and bridleways, with the rest on lanes and many road crossings, gates and stiles. Five aid stations and full marking support runners inside a 9-hour limit, and there is no crew or pacer access. Held each March as Centurion Running's season opener, it draws both first-time ultra runners and a fast, competitive front of the field.
Suitable for first-timers
Stonor, Oxfordshire, United KingdomMarch 20, 2027
Hundred Hills 50km is a loop trail race in Stonor, Oxfordshire, United Kingdom, held on March 20, 2027. The course covers 50 km, climbs 1,219 m, and has a 9h cutoff.
| Location | km | Elevation | Cutoff |
|---|---|---|---|
Stonor Park Start | 0.0 | 95 m | — |
Ibstone Aid Station | 10.6 | 184 m | 1h50m10:35 AM |
Skirmett Aid Station | 17.9 | 71 m | 3h10m11:55 AM |
Stonor (Halfway) Aid Station | 23.3 | 95 m | 4h15m1:00 PM |
Hambleden Aid Station | 32.2 | 43 m | 5h50m2:35 PM |
Bix Aid Station | 41.4 | 132 m | 7h30m4:15 PM |
Stonor Park Finish | 50.0 | 95 m | 9h5:45 PM |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
Runners may not be accompanied by a dog at any time on course (rule 16, disqualification). The race does not say whether spectators may bring dogs to Stonor Park.
Mid-March in the Chilterns is cool and damp. The race lists an average of about 10°C (50°F), 90% humidity and around 60 mm of rain for the month. Conditions range from bright spring sunshine to cold rain, and after wet spells the chalk paths and field edges turn muddy and slippery. Parking is on grass and can become waterlogged.
Wet March weather turns paths and field edges muddy and slippery
March averages around 10°C; cold rain and wind can chill runners quickly
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