Merthyr Tydfil, United Kingdom · Saturday, November 7, 2026

Fixed Distance 50K

OTT Ultra 30 Miles

Race day

48 km Distance

4,000 m Climbing

8.4 Grit · Hardcore

51.7479° N, 3.3778° W© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 83 m / km Vertical. Extreme verticality. This is a technical mountain course with sustained steep grades.

Field size ~45 Small. Long stretches with nobody in sight.

DUV results for the 2021 edition (30mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, November

Daytime high 10°C

Night low 6°C

Rainfall Showers likely

Daylight 9 h 21 m of light

Regional 2001-2025 average for November — NASA POWER, grid elevation 96 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a vertical course. Poles are highly recommended for the sustained climbs.

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 48 km of trail with 4,000 m of ascent.

Trail Running Shoes83 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition48 km of self-supported fuelling between aid stations.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles4,000 m of ascent to walk up.
GPS WatchesBattery life first — a 48 km day outlasts most full-GPS modes.

Adidas

Terrex Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 4.5

Brooks

Catamount 3

RunRepeat found the Brooks Catamount 3 to have a cozier upper that enhances the overall fit, though breathability and durability could be better. iRunFar noted…

★★★★★ 4.5

Skratch Labs