Iffley, United Kingdom · Saturday, October 24, 2026

Fixed Distance 50 mi

Thames Trail Ultra

51 days away

77 km Distance

342 m Climbing

4.4 Grit · Challenging

51.7287° N, 1.2381° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 4 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 11 hours 8:34 min/km average. Comfortable. Room to walk the climbs and stop at aid. Among the tightest 50 mi cut-offs we track. Measured against 445 races of the same distance. Cut-off calculator →

Field size ~75 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (48mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, October

Daytime high 15°C

Night low 7°C

Rainfall Mostly dry

Daylight 10 h 12 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 112 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a fast & flat 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

Gear for this race

Chosen for 77 km of trail with 342 m of ascent.

Trail Running Shoes 77 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 77 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 77 km, without the bounce.
GPS Watches Battery life first — a 77 km day outlasts most full-GPS modes.

Brooks

Catamount 3

★★★★★ 4.5

Adidas

Terrex Speed Ultra

★★★★★ 4.5

Tailwind

Endurance Fuel

All-in-one calorie and electrolyte drink mix. 200 calories per serving.

$25 ★★★★★ 4.8

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Garmin

Enduro 3

Ultra-endurance GPS watch with solar charging and 300+ hour battery in GPS mode.

$900 ★★★★★ 4.8

All gear guides →

Course Notes

Thames Trail is a 48 mile point to point Ultra Marathon starting at the Hawkwell House Hotel in Iffley and finishing at the Y Centre in Henley on Thames. The route is country trails, riverside paths and roads along the Thames

Similar races

Other 50 mi trail ultras, closest in distance first.