How far is the Snowdon Ultra 100?

The Snowdon Ultra 100 is one distance: 100 Mile (164.2 km / 102.0 miles).

How much climbing is in the Snowdon Ultra 100?

The 100 Mile has 5,172 m of ascent.

What are the cut-offs for the Snowdon Ultra 100?

Overall time limits — 100 Mile: 42h.

When is the next Snowdon Ultra 100?

Sat, 5 Sept 2026, 06:00. Entries open.

Betws-y-Coed, Conwy

GB Ultras Snowdon Ultra 100

Sat, 5 Sept 2026

A hundred miles and 5,000 metres of Eryri.

1 review so far — too few to average, so we are not going to pretend otherwise. Read it or add yours.

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.

The course

164.2

km · 102.0 mi

5,172

m ascent

42h cut-off

Terrain and trail

mountainfell

Reviews

Add yours

★★★★★

Jason MillwardNewcomer2018 · 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.

How to enter

Sat, 5 Sept 2026 · Entries open

No entry link yet. Check GB Ultras’s site ↗

Common questions

: The Snowdon Ultra 100 is one distance: 100 Mile (164.2 km / 102.0 miles).
: The 100 Mile has 5,172 m of ascent.
: Not graded yet. A TRP grade is worked out from distance and climb measured off the course file, and there isn't one for the Snowdon Ultra 100 yet.
: We haven't confirmed the marking on the Snowdon Ultra 100 with GB Ultras. Check their race information before you enter rather than assuming it either way.
: We don't hold a compulsory kit list for the Snowdon Ultra 100. GB Ultras confirm mandatory kit in their race information, usually in the final instructions.
: Overall time limits — 100 Mile: 42h.
: We don't hold a checkpoint list for the Snowdon Ultra 100. What's on the table varies a lot between races, so check the GB Ultras race information rather than turning up expecting food.
: Not yet — we don't hold a course file for the Snowdon Ultra 100. Some organisers only send the GPX to entrants. If we get one, it goes up free, with no sign-up.
: Sat, 5 Sept 2026, 06:00. Entries open.