Skip to content

GB Ultras Snowdon Ultra 100

Betws-y-Coed, ConwyNo date announced yet

A hundred miles and 5,000 metres of Eryri.

100 Mile

161 km

5,821 m ascent

36 m per km

42h cut-off

15:40/km to make it

mountainfellNavigation required

1 review so far — too few to average, so we are not going to pretend otherwise. Read it or add yours. Running it soon? Connect Strava and we will ask you the day you finish.

What runners wore

From 1 runner who told us, not from the organiser.

Shoes

  • Inov-8 Trailfly G 270 — 100% would wear them again1

Add what you wore and it appears here.

Reviews

Add yours
★★★★★Jason MillwardWaymarker2018 · 100 Mile

Beat me

I dnf'd at mile 65 due to getting a bit lost and having to bash through wet bracken which made me too cold to get moving again. Couldn't get warm again. Gutted. The route is stunning and you can't beat a summit of Eryri in a race. Really enoyed the route before I dropped out

Wore Inov-8 Trailfly G 270.

The course

Loading map…

EXPERT

TRP grade · E5·T3

42h cut-off, which needs 15:40/km

14 checkpoints

Download GPXFree, no sign-up.

This file is from a previous running and the course may have changed since. If you are navigating with it, get the current version from GB Ultras first.

What you’re in for

A hundred and two miles out of Betws-y-Coed with 5,172 m of climb, leaving on the Snowdonia Slate Trail to Beddgelert, then through Nant Gwynant past Sygun Copper Mine, Llyn Dinas and Llyn Gwynant, and over Yr Wyddfa itself. You navigate. A hardcopy map is mandatory — OS OL17 and OL18, or Harvey — and there are steep drops and cliff edges where a wrong line matters. Eleven checkpoints every six to ten miles, forty-two hours. The GPX comes with a low-level option for severe weather.

Blacks sale: final clearance

Partner · affiliate policy

More from GB Ultras

Every GB Ultras race →

Other races GB Ultras put on, soonest first.

Other races near here

Eryri (Snowdonia) races →

Races from other organisers starting within 30 km of Betws-y-Coed, Conwy, nearest first.

How to enter

No date announced for the next running yet. GB Ultras’s site ↗ is where it will show up first.

Common questions

The Snowdon Ultra 100 is one distance: 100 Mile (160.9 km).

Past runnings

2026Sat, 5 Sept 2026