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Ultras · United Kingdom · Wales

Eryri by UTMB 100M

Eryri by UTMB 2027
Registration open
Registrations are open.
Race dateMay 14-16, 2027
Duration3 days
Start2:00pm
Whenin 199 days

Who's going to Eryri by UTMB 100M?

I'm running itPlan your weeks and your aid station times I'm crewingWhen to leave, where to park, at every stop I'm pacing or cheeringAsk your runner for their Out Here link

Free. You can start with nothing.

Official website Results Aid stations Notify me if this race changes
Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance The race
163K
Climb Our math
30,581 ft We worked this out from what the race prints.
Descent Our math
30,581 ft We worked this out from what the race prints.
High point
not checked yet
Time limit The race
48:00:00
Aid stations
24
Started
not checked yet
Finished
not checked yet
Finish rate
not checked yet
The course

Where it goes loop · 24 aid stations

Course line from the race's own GPX. Source file. Recorded 2026.

Eryri 100M is a 163 km, 9,200 m+ loop from Llanberis with a 48 hour limit. It starts at 14:00 on Friday and runs through two nights.

Terrain runs from rocky scree and boulder fields to boggy moorland, with technical ridges and some easy scrambling.

The race

What this one is

A 163 km loop of the northern mountains of Eryri (Snowdonia), starting from Llanberis on Friday afternoon and finishing back in the village. The route passes over Glyder Fawr, Carnedd Llewelyn, Moel Siabod, Moelwyn Mawr, Cnicht, Moel Hebog and Yr Wyddfa (Snowdon) and has 48 hours to finish.

Eryri by UTMB began as an idea in 2015, when British runner Michael Jones, training for UTMB in the Alps, wondered why the UK had no ultra-trail race with a similar mountain character. It became Ultra-Trail Snowdonia by UTMB, first held in 2018. From 2027 the event is called Eryri by UTMB, using the Welsh name for the area.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery
not checked yet
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
not checked yet
Registration
UTMB eryri.utmb.world
Qualifying
A valid UTMB Index in the 100K or 100M category is needed to register. A UTMB Index of at least 380 is recommended to make the cut-offs. eryri.utmb.world
Minimum age
20 eryri.utmb.world
Transfers
No eryri.utmb.world
Deferrals
No eryri.utmb.world
Crew access, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed
Yes eryri.utmb.world
Vehicles per runner
not checked yet
Pacers
No eryri.utmb.world
Muling
not checked yet
Drop bags
Yes eryri.utmb.world
Cupless
Yes eryri.utmb.world
Course marking
Fully Marked eryri.utmb.world
Night running
Yes eryri.utmb.world
Dogs
Not allowed eryri.utmb.world
Headphones
Allowed eryri.utmb.world
Crew rules
One personal assistant per runner, at defined locations inside specific aid stations only, wearing the 'Supporter' wristband issued with the bib. The assistant can pass the runner a bag of up to 30 litres. Teams of professionals, physios and medics are not allowed. eryri.utmb.world
Pacer rules
Nobody who is not entered in the race may accompany a runner, apart from marked spectator run zones within 500 m of an aid station. eryri.utmb.world
Drop bag rules
One 30 litre UTMB World Series drop-bag, handed in at the Bag Drop marquee before the start and taken to Croesor aid station. Collect it at the event venue after the race. Poles are not allowed in the bag. eryri.utmb.world
Cutoff philosophy
Cut-offs are set so that someone running or walking at an average pace can reach each aid station and the finish inside the time allowance. They are there for the safety of runners, volunteers and the mountain safety team. The recommended minimum average speed, breaks included, is 4.5 km/h on training runs up to 60 km and 3.5 km/h above that. eryri.utmb.world
Aid stations

Every stop, and what you get there ● yes   ○ no   ? nobody has checked   – does not apply to this race

Mile Station Cutoff Crew access Bag Pacer Med To next
? Llanberis
NoneSignal wrong?
 ? ? ? ? ? ?
? Bwlch Glas (Finger Stone)
NoneSignal wrong?
 ? ? ? ? ? ?
? Pen-y-Pass
NoneSignal wrong?
 5:30pm ? ? ? ● ?
? Glyder Fawr
NoneSignal wrong?
 ? ? ? ? ? ?
? Ogwen Valley
NoneSignal wrong?
 8:00pm ? ? ? ● ?
? Carnedd Llewelyn
NoneSignal wrong?
 ? ? ? ? ? ?
? Llyn Eigiau
NoneSignal wrong?
 12:30am ? ? ? ● ?
? Capel Curig
NoneSignal wrong?
 3:00am ? ? ? ● ?
? Moel Siabod
NoneSignal wrong?
 ? ? ? ? ? ?
? Dolwyddelan
NoneSignal wrong?
 6:00am ● ? ? ● ?
? Blaenau Ffestiniog
NoneSignal wrong?
 9:30am ● ? ? ● ?
? Moelwyn Mawr
NoneSignal wrong?
 ? ? ? ? ? ?
? Croesor
NoneSignal wrong?
 1:00pm ? ● ? ● ?
? Cnicht
NoneSignal wrong?
 ? ? ? ? ? ?
? Gwastadanas Farm
NoneSignal wrong?
 4:45pm ? ? ? ● ?
? Beddgelert
NoneSignal wrong?
 8:30pm ● ? ? ● ?
? Moel Hebog
NoneSignal wrong?
 ? ? ? ? ? ?
? Rhyd-Ddu
NoneSignal wrong?
 2:00am ? ? ? ● ?
? Yr Wyddfa/Snowdon
NoneSignal wrong?
 ? ? ? ? ? ?
? Bron-y-Fedw Uchaf
NoneSignal wrong?
 6:45am ● ? ? ● ?
? Mynydd Mawr
NoneSignal wrong?
 ? ? ? ? ? ?
? Betws Garmon
NoneSignal wrong?
 9:45am ? ? ? ● ?
? Moel Eilio
NoneSignal wrong?
 ? ? ? ? ? ?
? Llanberis
NoneSignal wrong?
 2:00pm ? ? ? ● ?
What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

Nobody has been out there with a camera or a microphone yet. A gap means nobody has found it, not that it is not out there. Seen a course preview or a film of this one? Send us the link.

Add to this page

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Leave blank if it applies to the whole race.

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Write it the way you would say it to someone at the start line.

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See something wrong or out of date? Suggest an edit.

This changes nothing on the page on its own. Somebody checks it against the race first.

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Copy it as it appears, so we can find it.

The corrected value.

Required. Where it came from: the race email, the runner manual, what you saw on the day.

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Optional, only so we can come back to you about this correction.

Leave blank if it is about the whole race.

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Seen a course preview or a film of this one? Send it over.

Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

Required. A line is plenty. Where the climbs are, what the footing does, what the last twenty miles look like.

Optional, and it decides nothing.

Optional.

Optional, and never shown on the page. Only so we can ask you a question about this one.

A YouTube link, a race report, a photo gallery, whatever it is.

Optional, and we credit them on the page.

Leave this field blank.

Have the GPX? Send us the link.

We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.

The page or file on the race's own site.

Optional, and only so we can ask you a question about it.

Are you the race director? Get in touch and we'll make it right.

We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.

Required, because this is a conversation and we write back.

Tell us what is wrong, out of date, or missing on this page. We read every one of these and we will get back to you.

Optional.

So we know who we are writing back to.

Optional. Director, assistant, comms, whoever you are.

Leave this field blank.

Where this came from. Every fact on this page records its source and when we last checked it: 240 sources for this race. Hover a source link to read the sentence it came from.
52% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Were you out there? Say which stops a text got out from
Got footage of this course? Send us the link
Are you the race director? Get in touch and we'll make it right.
Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.