Haslemere, United Kingdom · Saturday, July 4, 2026

Fixed Distance 100K

Serpent Trail Race 100km

Race completed
100 km Distance
1,785 m Climbing
7.7 Grit · Hardcore
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51.0902° N, 0.7078° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 18 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.
Time limit 18 hours 10:48 min/km average. Generous. Walkable throughout for most of the field. About average for a 100K. Measured against 203 races of the same distance. Cut-off calculator →
Field size ~132 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, July

Daytime high 22°C
Night low 13°C
Rainfall Mostly dry
Daylight 16 h 27 m of light

Regional 2001-2020 average for July — NASA POWER, grid elevation 51 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a rolling course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert
👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert
🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail with 1,785 m of ascent.

  • Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
  • Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
  • Hydration Vests Flask capacity for 100 km, without the bounce.
  • Headlamps A 18 h limit puts you out there after dark.
  • Accessories Chafe and blisters end more 100 km races than fitness does.

Adidas

Terrex Agravic Speed Ultra

★★★★★ 4.5

Brooks

Catamount 3

★★★★★ 4.5

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5

Darn Tough

Micro Crew Ultra Running

Merino wool trail running socks with lifetime warranty. Blister-resistant.

$23 ★★★★★ 4.7
All gear guides →

Course Notes

The bigger climbs and more regular ascents come in the first half of the race with some long downhill sections and the route is then flatter for the last 30km.  The trail is a mix of tracks, paths and short sections of road on generally sandy trails.

Similar races

Other 100K trail ultras, closest in distance first.