Next race
Saturday, 24 October 2026
10:30 am start
Distance
42.195 km / 26.2 mi
Mountain road
Elevation
Hilly · 250 m gain
250 m climbing
Race profile
The Marathon Eryri draws approximately 2,500 finishers each October on a mountain road in Llanberis, United Kingdom. It is one of the UK's iconic tough road marathons and rewards strength more than pace ambition. The course passes mountain lakes, steep Welsh road sections, and dramatic Snowdonia views almost throughout. Expect significant climbs on this hilly course.
Marathon Eryri is a certified 42.195 km (26.2 mile) marathon — the standard World Athletics marathon distance.
Approximately 2,500 finishers
Course & terrain
Starts and finishes in Llanberis at the foot of Yr Wyddfa. The course passes mountain lakes, steep Welsh road sections, and dramatic Snowdonia views almost throughout. Hilly with notable climbs. Moderate terrain throughout.
The Marathon Eryri course is hilly over 42.195 km (26.2 miles). Runners cover 250 metres of climbing and 200 metres of descent, with a net climb of 50 metres from start to finish.
Hilly · 250 m gain — approx. 128 m above sea level
↑ 250 m · ↓ 200 m · net +50 m
Download the Marathon Eryri GPX file
Marathon Focus' proprietary GPX processing removes duplicate points, adds elevation data, and formats the file so you get a cleaner, more reliable route to load into your Garmin, Coros, or Apple Watch fitness watch.
Registration
The Marathon Eryri uses open online registration at marathoneryri.com with no ballot or qualifying time for the general field. Sign-up for the October race typically opens the previous year and places are allocated first-come, first-served. Charity bibs are available through partner organisations when general entry closes.
Getting there
Liverpool (LPL)
Liverpool John Lennon Airport
89 km / 55 mi
Castletown, Rushen (IOM)
Isle of Man Airport
112 km / 70 mi
Common questions
Official resources
Last updated 11 October 2026. Edition dates and course details are reviewed regularly.
Close to this race
Other races closest to Llanberis.
The Chester Marathon attracts about 5,000 finishers each October through England's Roman walled city. The course passes the Eastgate Clock, Chester Cathedral, the Roman walls, and the Dee River on flat Cheshire terrain. October autumn weather and the historic Roman-heritage setting make it one of northwest England's most popular marathons.
Next race: Sunday, 2 May 2027
The Manchester Marathon is one of the world's largest marathons, drawing approximately 28k finishers on an urban road in Manchester, United Kingdom. The course starts and finishes at Old Trafford. One of the UK's fastest courses, with no significant hills.
Next race: Sunday, 18 April 2027
The Newport Marathon Festival draws approximately 1,999 finishers each April on an urban road in Newport, United Kingdom. It is widely regarded as one of the fastest full marathons in Wales. The route passes the River Usk, city bridges, and wide roads used for one of Wales's faster marathon layouts. Gentle undulations are the only breaks on an otherwise flat profile.
Next race: Sunday, 18 April 2027
The Rob Burrow Leeds Marathon honours the Leeds Rhinos rugby league legend and MND campaigner, drawing approximately 4,380 finishers each May through Yorkshire's largest city. The course passes Kirkstall Abbey, Roundhay Park, and the Leeds city centre before finishing outside Headingley Stadium. May's Yorkshire spring and enthusiastic local crowds make it one of northern England's most emotional community marathons.
Next race: Sunday, 9 May 2027
Planning guides
Practical guides to help you plan, train for, and run this race.
What flat, rolling, and hilly really mean — and how to read elevation gain, net change, and altitude on a marathon course.
How temperature, humidity, wind, and rain affect marathon performance — and how to use typical race-day weather when choosing a start line.
Match a race to your goals — personal bests, sightseeing, atmosphere, or a major milestone — using course data and realistic expectations.
