Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Ultra Marathons
Snowdonia Trail Ultra Marathon 2027
- Race day
- Saturday, 10 July 2027
- Location
- Llanberis, Gwynedd, UK
- Distance
- 36 mi / 57.9 km
Snowdonia Trail Ultra Marathon: 10 July 2027, from Llanberis, Eryri (Snowdonia), Gwynedd. Entry, route, a pace chart and the race-day forecast.
Snowdonia Trail Ultra Marathon Race Timeline
303 days to go
More than 126 days out — a good window to build a consistent base before ultra-specific training ramps up.
Snowdonia Trail Ultra Marathon 2027: quick answers
When is Snowdonia Trail Ultra Marathon 2027?
Snowdonia Trail Ultra Marathon 2027 takes place on Saturday, 10 July 2027, starting at 06:30, though subject to change.
What time does Snowdonia Trail Ultra Marathon start?
Snowdonia Trail Ultra Marathon starts at 06:30, though subject to change from Llanberis, Eryri (Snowdonia), Gwynedd.
Where does Snowdonia Trail Ultra Marathon start and finish?
Snowdonia Trail Ultra Marathon starts at Llanberis, Eryri (Snowdonia), Gwynedd and finishes at Llanberis, Eryri (Snowdonia), Gwynedd.
How many miles is Snowdonia Trail Ultra Marathon?
Snowdonia Trail Ultra Marathon is 36 miles (57.9km).
How much elevation gain does Snowdonia Trail Ultra Marathon have?
Snowdonia Trail Ultra Marathon has approximately 7500ft of total elevation gain. 7,500ft (2,286m) of ascent across 36 miles, per the organiser — that works out at roughly 208ft of climb per mile. The going: eryri mountain trail — rock, scree, steep grass and the snowdon paths.
How much does Snowdonia Trail Ultra Marathon cost to enter?
Entry through Always Aim High Events — check the official site for current pricing.
Key Race Metrics & Overview
- Date
- Saturday, 10 July 2027
- Distance
- 36 miles / 57.9km
- Location
- Llanberis, Gwynedd, UK
- Start Point
- Llanberis, Eryri (Snowdonia), Gwynedd
- Finish Point
- Llanberis, Eryri (Snowdonia), Gwynedd
- Start time
- 06:30, though subject to change
- Elevation gain
- 7500 ft (2286m)
- Surface
- Eryri mountain trail — rock, scree, steep grass and the Snowdon paths
Not published by the organiser at the time of writing: cut-off time, age requirement, tracking app. Verus records these as unconfirmed rather than estimating them — check the official race website closer to race day.
Direct Entry Summary
Entry through Always Aim High Events — check the official site for current pricing.
Ballot Policy
No ballot — entry is direct through Always Aim High Events.
Snowdonia Trail Ultra Marathon Race Day Weather
A real forecast appears here once one exists for race day — usually about a week to ten days out. Nothing is shown until then, because a made-up forecast is worse than none.
Snowdonia Trail Ultra Marathon Route Map & Elevation Profile
Starting at Llanberis, Eryri (Snowdonia), Gwynedd and finishing at Llanberis, Eryri (Snowdonia), Gwynedd. 7500 ft of total elevation gain across 36 miles.
Is Snowdonia Trail Ultra Marathon flat?
7,500ft (2,286m) of ascent across 36 miles, per the organiser — that works out at roughly 208ft of climb per mile. The going: eryri mountain trail — rock, scree, steep grass and the snowdon paths.
Snowdonia Trail Ultra Marathon Course Profile
7500 ft total elevation gain.
Tap a point on the course for details.
Llanberis, Eryri (Snowdonia), Gwynedd
Start line.
Where Snowdonia Trail Ultra Marathon starts and finishes
Snowdonia Trail Ultra Marathon starts at Llanberis, Eryri (Snowdonia), Gwynedd and finishes at Llanberis, Eryri (Snowdonia), Gwynedd. We haven't been able to place those on a map accurately enough to show one — a pin in the wrong place is worse than no pin.
These are the start and finish points, not the route. Verus doesn't hold course files for this race, and drawing a line between two pins would be a guess you might end up training on.
Full Snowdonia Trail Ultra Marathon Route Breakdown
58km with 2,286m of climbing through Eryri National Park from Llanberis — the ultra distance at what is one of Britain's most established mountain trail events. The marathon that runs alongside it climbs 1,750m over 28.9 miles and summits Snowdon.
Snowdonia Trail Ultra Marathon Pace Calculator & Splits
Snowdonia Trail Ultra Marathon Pace Calculator
Enter a target finish time to see your pace and projected splits.
Average pace / mile
6:40
Average pace / km
4:09
Snowdonia Trail Ultra Marathon Pace Chart
Split markers calculated for standard checkpoints — no official pacers are confirmed for this event.
| Target | Pace /mi | Pace /km | 5K | 10K | Half Marathon | 30K | Finish |
|---|---|---|---|---|---|---|---|
| 3:00 | 5:00 | 3:06 | 15:32 | 31:04 | 1:05:33 | 1:33:12 | 3:00:00 |
| 3:15 | 5:25 | 3:22 | 16:50 | 33:39 | 1:11:01 | 1:40:58 | 3:15:00 |
| 3:30 | 5:50 | 3:37 | 18:07 | 36:15 | 1:16:28 | 1:48:44 | 3:30:00 |
| 3:45 | 6:15 | 3:53 | 19:25 | 38:50 | 1:21:56 | 1:56:30 | 3:45:00 |
| 4:00 | 6:40 | 4:09 | 20:43 | 41:25 | 1:27:24 | 2:04:16 | 4:00:00 |
| 4:15 | 7:05 | 4:24 | 22:00 | 44:01 | 1:32:51 | 2:12:03 | 4:15:00 |
| 4:30 | 7:30 | 4:40 | 23:18 | 46:36 | 1:38:19 | 2:19:49 | 4:30:00 |
| 4:45 | 7:55 | 4:55 | 24:36 | 49:12 | 1:43:47 | 2:27:35 | 4:45:00 |
| 5:00 | 8:20 | 5:11 | 25:53 | 51:47 | 1:49:15 | 2:35:21 | 5:00:00 |
| 5:30 | 9:10 | 5:42 | 28:29 | 56:58 | 2:00:10 | 2:50:53 | 5:30:00 |
| 6:00 | 10:00 | 6:13 | 31:04 | 1:02:08 | 2:11:06 | 3:06:25 | 6:00:00 |
| 6:30 | 10:50 | 6:44 | 33:39 | 1:07:19 | 2:22:01 | 3:21:57 | 6:30:00 |
| 7:00 | 11:40 | 7:15 | 36:15 | 1:12:30 | 2:32:57 | 3:37:29 | 7:00:00 |
Snowdonia Trail Ultra Marathon Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your Snowdonia Trail Ultra Marathon finish time.
Your 5K time
Estimated Snowdonia Trail Ultra Marathon finish
5:35:33
An estimate only, based on Pete Riegel's race-time prediction formula. Real marathon performance depends on endurance, training specificity, pacing and race-day conditions — not just your speed over a shorter distance.
Training for a different distance? Try the full pace calculator, race time predictor or pace chart.
Got your target time? Save it to your profile.
Tag Snowdonia Trail Ultra Marathon, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneySnowdonia Trail Ultra Marathon Race Day Checklist
Tap items to mark off your race-day readiness.
- Race number attached, and any timing chip fitted per your race pack instructions
- Weather-appropriate kit, plus something warm and disposable to discard before the start
- A plan for reaching Llanberis, Eryri (Snowdonia), Gwynedd
- A meeting point agreed with family and friends for after the race
Training Strategy for Snowdonia Trail Ultra Marathon
20-24 weeks is the realistic window for a first 36-mile ultra, assuming you already have a marathon's worth of base behind you. The block that matters is back-to-back long weekends — a long run on Saturday followed by a second, slower one on Sunday — which builds time on feet and teaches you to run on tired legs without the recovery cost of one enormous day. Practise your race-day nutrition on every one of them; at this distance the stomach fails before the legs do.
This is a largely flat course, so most of your long runs can mirror that — flat and steady, building time on feet rather than hill strength.
Drop volume hard across the final three to four weeks — further out and steeper than a marathon taper, because a 30-mile training day costs weeks of recovery, not days. Keep some easy running and a little terrain-specific work in, but the goal is to reach Llanberis, Eryri (Snowdonia), Gwynedd with fresh feet and a rested gut rather than one more long run in the bank.
Lock in your target pace using the interactive splits calculator below — no official pacers are confirmed for this event, so a pace band on your watch is the more reliable option.
Test your race-day fuel and hydration plan on your long training runs, not for the first time on race day — check the Race Day Checklist below for what's actually on this course.
36-Mile Ultra Nutrition & Fueling Plan
A deliberate increase in carbohydrate over the two to three days before the race is the well-established approach at marathon distance.
Eat a carbohydrate-focused breakfast two to three hours before the start, and stick to something you've already tested in training rather than trying anything new.
Most runners take on carbohydrate every 30 to 45 minutes from about an hour in, alongside fluid at the on-course stations.
A mix of carbohydrate and protein in the hour or so after finishing supports recovery.
Snowdonia Trail Ultra Marathon Charity Places 2027
No formal charity-place scheme published — runners commonly fundraise for a charity of their own choosing.
Lead with your personal story — explain why the charity matters to you. Personal connection generates 3x more support than a generic link broadcast.
Share key training milestones on Instagram (first 10-miler, peak week, race week) with your fundraising link in bio. Publicly thanking donors prompts secondary gifts!
Running Snowdonia Trail Ultra Marathon for charity?
Link your JustGiving page to Verus and show up right here alongside other Snowdonia Trail Ultra Marathon fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusTravel & Logistics
No road closures — the Snowdonia Trail Ultra Marathon is run off-road (Eryri mountain trail — rock, scree, steep grass and the Snowdon paths), so local traffic is unaffected.
Snowdonia Trail Ultra Marathon Frequently Asked Questions
Everything you need to know for race weekend.
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Race details independently compiled and fact-checked by Tommo against the official Snowdonia Trail Ultra Marathon site , last verified August 2026. Always confirm official timings and policies directly prior to race day.