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Ultra-Trail Snowdonia by UTMB
164km164106km10656km56

UTS 50K

UTMB World Series
56.0km
May 15
Llanberis,
United Kingdom
utmb·source

Race Pace Calculator · GPX Analyzer · Trail Finder

Other races: United Kingdom

Read

  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents
  • Downhill Running Muscle Damage: Why Descents Wreck Quads

Full calendar: United Kingdom50K trail race calendar

UTS 50K · Race profile

Distance
56.0km
FlatKM
84.5
Max
1038m
Min
60m

About UTS 50K

UTS 50K is the 56.0km trail race at Ultra-Trail Snowdonia by UTMB 2025 (Llanberis, United Kingdom). The race starts on May 15, 2025.

Race strategy

Hold a steady pace and save energy for every section.

  • 921m descent. Go easy, save your quads.
  • Steep 38% wall. Control your pace and stay focused.
  • Final 710m descent. Save your legs to go all out on it.
  • Long race. Control your HR and effort. Early mistakes cost the most.
  • Control your HR on the first mountain, save your quads on the descents until 39.6km, then run your race pace, and start the final descent from 46.3km under control, then go all out near the bottom.
  • Start · 0.0km–1.2km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.2km–14.6km · Climb of 878m, descent of 921m averaging 12%. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Hike the steepest pitches.
  • Work · 14.6km–25.8km · Climb of 1037m. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. Hike the steepest pitches.
  • Fade · 25.8km–46.3km · Descent of 896m averaging 14%, high point 1044m, descent of 552m averaging 15%, climb of 581m. Plus 1 more climb. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Hike the steepest pitches. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
  • Home · 46.3km–55.4km · Descent of 710m averaging 8%. No heroics: settle back into your own effort and hold it to the line. Very long descent: first half under control, then even, let go only near the end.

Course

By gradient, 40% of the distance is uphill, 41% downhill and 19% flat. The longest climb runs 11.1km at an average 9.3% grade (1037m of vertical). The longest descent runs 9.1km at an average 7.8% grade (710m of vertical). The steepest climb averages 37.8% over 0.4km. The steepest descent drops at 34.1% over 0.5km. Surface: 31% trail, 30% technical, 30% smooth, and 7% road. Flat-equivalent effort: 84.5 FlatKM.

Summits

The highest summit on the course is Snowdon (1085m), 25.9km from the start. Other named summits along the route: Clawdd Coch (931m) and Moel Eilio (726m).

Poles

Trekking poles are worth taking: about 8.8km of the course favours them.

Quad damage

Quad damage risk is moderate (index 40 of 100), with 48% of the load in the first half: 3 descents deserve a plan and a couple of downhill sessions before race day.

  • Control your HR on the first mountain, save your quads on the descents until 39.6km, then run your race pace, and start the final descent from 46.3km under control, then go all out near the bottom.
  • #1 · 6.8–14.6 km · 921 m D−, -11.8% · 40.7 km ahead → control
  • #2 · 25.8–32.4 km · 896 m D−, -13.6% · 23.0 km ahead → control
  • #3 · 35.8–39.6 km · 552 m D−, -14.6% · 15.7 km ahead → control
  • 46.3–55.4 km · 710 m D−, -7.8% · 0.0 km ahead → even, first half under control, let go at the end

Results

965 finishers completed the 2025 edition. Men's winner: Kristian Jones (Great Britain) in 5:33:22. Women's winner: Eleanor Davis (Great Britain) in 6:44:43.

This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for UTS 50K.

Other distances of Ultra-Trail Snowdonia by UTMB 2025UTS 100M (164km)·UTS 100K (106km)

Other editions of UTS 50K2026

Official websitesnowdonia.utmb.world