The Ultra-Trail Snowdonia Eryri by UTMB will unfold over 15–17 May 2026 in the mountain village of Llanberis, North Wales, offering runners a spectacular challenge in the heart of Snowdonia National Park. Participants can choose from four demanding mountain races: the UTS 100M, UTS 100K, UTS 50K, or the shorter but still tough ERYRI 25K. Each route delivers steep climbs, technical trails, and sweeping views of Wales’ highest peaks, earning the event a reputation as one of the most challenging in the UTMB World Series. With its mix of wild landscapes and supportive atmosphere, it draws elite mountain athletes and adventurous trail runners from across the globe.
Races
100 Mile
104 km
56 km
25 km
Race Date:
15 May, 2026
ChatGPT said: The UTS 100M race at Ultra-Trail Snowdonia Eryri by UTMB will take place starting on Friday, 15 May 2026 in Llanberis, Snowdonia, Wales. The course begins and ends in the village of Llanberis, plunging runners into rugged mountain terrain, exposed ridges, and deep valleys for a massive test of endurance.
Race Date:
16 May, 2026
The UTS 100K race at Ultra-Trail Snowdonia by UTMB will take place on Saturday 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a roughly 104 km trail ultramarathon, sending runners into rugged mountain terrain with technical ridges and dramatic elevation gain.
Race Date:
16 May, 2026
The UTS 50K race will take place on Saturday, 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a challenging 56 km trail ultramarathon featuring around 3,400 meters of elevation gain, taking runners through rugged mountain terrain, technical ridges, and iconic Snowdonia landscapes.
Race Date:
17 May, 2026
The ERYRI 25K race will take place on Sunday, 17 May 2026 in Llanberis, Snowdonia (Eryri), Wales. It’s a 25-km mountain trail run with about 1,400 meters of elevation gain, starting from Llanberis and heading into rugged terrain around Eryri.
Weather based on historical averages.
FAQs
What is the UTS 100M?
How long is the UTS 100M?
Where does the UTS 100M take place?
What is the elevation gain of the UTS 100M?
How can I prepare for the UTS 100M?
How do I choose the right training plan for the UTS 100M?
ChatGPT said:
The UTS 100M race at Ultra-Trail Snowdonia Eryri by UTMB will take place starting on Friday, 15 May 2026 in Llanberis, Snowdonia, Wales. The course begins and ends in the village of Llanberis, plunging runners into rugged mountain terrain, exposed ridges, and deep valleys for a massive test of endurance.
The UTS 100M is 164km long.
The UTS 100M takes place in Llanberis, Caernarfon, UK.
The UTS 100M elevation gain is 9500 metres, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the UTS 100M?
ChatGPT said:
The UTS 100M race at Ultra-Trail Snowdonia Eryri by UTMB will take place starting on Friday, 15 May 2026 in Llanberis, Snowdonia, Wales. The course begins and ends in the village of Llanberis, plunging runners into rugged mountain terrain, exposed ridges, and deep valleys for a massive test of endurance.
How long is the UTS 100M?
The UTS 100M is 164km long.
Where does the UTS 100M take place?
The UTS 100M takes place in Llanberis, Caernarfon, UK.
What is the elevation gain of the UTS 100M?
The UTS 100M elevation gain is 9500 metres, which Runna classifies as a Hilly race.
How can I prepare for the UTS 100M?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the UTS 100M?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the UTS 100K?
How long is the UTS 100K?
Where does the UTS 100K take place?
What is the elevation gain of the UTS 100K?
How can I prepare for the UTS 100K?
How do I choose the right training plan for the UTS 100K?
The UTS 100K race at Ultra-Trail Snowdonia by UTMB will take place on Saturday 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a roughly 104 km trail ultramarathon, sending runners into rugged mountain terrain with technical ridges and dramatic elevation gain.
The UTS 100K is 104km long.
The UTS 100K takes place in Llanberis, Caernarfon, UK.
The UTS 100K elevation gain is 6500 metres, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the UTS 100K?
The UTS 100K race at Ultra-Trail Snowdonia by UTMB will take place on Saturday 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a roughly 104 km trail ultramarathon, sending runners into rugged mountain terrain with technical ridges and dramatic elevation gain.
How long is the UTS 100K?
The UTS 100K is 104km long.
Where does the UTS 100K take place?
The UTS 100K takes place in Llanberis, Caernarfon, UK.
What is the elevation gain of the UTS 100K?
The UTS 100K elevation gain is 6500 metres, which Runna classifies as a Hilly race.
How can I prepare for the UTS 100K?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the UTS 100K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the UTS 50K?
How long is the UTS 50K?
Where does the UTS 50K take place?
What is the elevation gain of the UTS 50K?
How can I prepare for the UTS 50K?
How do I choose the right training plan for the UTS 50K?
The UTS 50K race will take place on Saturday, 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a challenging 56 km trail ultramarathon featuring around 3,400 meters of elevation gain, taking runners through rugged mountain terrain, technical ridges, and iconic Snowdonia landscapes.
The UTS 50K is 56km long.
The UTS 50K takes place in Llanberis, Caernarfon, UK.
The UTS 50K elevation gain is 3400 metres, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the UTS 50K?
The UTS 50K race will take place on Saturday, 16 May 2026 in Llanberis, Snowdonia, Wales. It’s a challenging 56 km trail ultramarathon featuring around 3,400 meters of elevation gain, taking runners through rugged mountain terrain, technical ridges, and iconic Snowdonia landscapes.
How long is the UTS 50K?
The UTS 50K is 56km long.
Where does the UTS 50K take place?
The UTS 50K takes place in Llanberis, Caernarfon, UK.
What is the elevation gain of the UTS 50K?
The UTS 50K elevation gain is 3400 metres, which Runna classifies as a Hilly race.
How can I prepare for the UTS 50K?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the UTS 50K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the ERYRI 25K?
How long is the ERYRI 25K?
Where does the ERYRI 25K take place?
What is the elevation gain of the ERYRI 25K?
How can I prepare for the ERYRI 25K?
How do I choose the right training plan for the ERYRI 25K?
The ERYRI 25K race will take place on Sunday, 17 May 2026 in Llanberis, Snowdonia (Eryri), Wales. It’s a 25-km mountain trail run with about 1,400 meters of elevation gain, starting from Llanberis and heading into rugged terrain around Eryri.
The ERYRI 25K is 25km long.
The ERYRI 25K takes place in Llanberis, Caernarfon, UK.
The ERYRI 25K elevation gain is 1400 metres, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the ERYRI 25K?
The ERYRI 25K race will take place on Sunday, 17 May 2026 in Llanberis, Snowdonia (Eryri), Wales. It’s a 25-km mountain trail run with about 1,400 meters of elevation gain, starting from Llanberis and heading into rugged terrain around Eryri.
How long is the ERYRI 25K?
The ERYRI 25K is 25km long.
Where does the ERYRI 25K take place?
The ERYRI 25K takes place in Llanberis, Caernarfon, UK.
What is the elevation gain of the ERYRI 25K?
The ERYRI 25K elevation gain is 1400 metres, which Runna classifies as a Hilly race.
How can I prepare for the ERYRI 25K?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the ERYRI 25K?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Tags:
Nature
UTMB
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Ultra-Trail Snowdonia Eryri or UTMB World Series. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Ultra-Trail Snowdonia Eryri website.
