50K ultra runs
A 50K ultra is the most popular way to step beyond the marathon. Events combine endurance, adventure and achievable distances, making them ideal for first-time ultra runners. Use the filters to find 50K ultras by date, location or terrain. Read more
A 50K ultra run covers just over 31 miles, offering a manageable introduction to ultra-distance running without the commitment of longer events. Many 50K ultras take place on scenic trails, rolling countryside or multi-loop courses, making pacing and nutrition easier to manage.
These events are popular with marathon runners looking for a new challenge, as well as trail runners keen to explore longer distances. You’ll find beginner-friendly options with generous cut-off times alongside more technical courses for experienced off-road runners.
Use the filters to narrow your search by date, location or route type — to find your perfect ultra.
If you’re aiming to go further, you can also explore our 100K ultras or 100-mile ultra events once you’ve built confidence at this distance.
Want to read more? Read the guides, tips and advice from our blog.
Got questions? Read our FAQs for answers.
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Map view50K ultra runs 2026–2027
Discover 50K ultras across the UK and beyond and get ready for your next start line.
- Fri 17 Apr
- £15-£27
Midweek Medal Madness Run April | 50K
The aim of the midweek runs is to hold events as cheaply as possible in order for people to be able to build their numbers or simply to help people achieve their own goals at an affordable price.
- 50 km trail running
- Sat 18 Apr
- £139
Windsor 50 Ultra Challenge | 50km
Get active after Easter on a 50km challenge from Windsor Racecourse on looped routes through the Great Park with fantastic views of the castle, to Runnymede along the Thames Path.
- 50 km trail running + 320 m ascent
- Sat 18 Apr
- £23-£35
The London Run | 50K
Not made it into The London Marathon but still fancy getting a super awesome medal based on the iconic race set in the capital city? Come and enjoy a 50K instead!
- 50 km trail running
- Sat 18 Apr
- FREE-£100
Spring Trail Series | 50K
Join over 1,200 runners and walkers to the Serpent Trail, a stunning route that weaves through the greensand hills, rivers, woodland, and lowland heath of the South Downs National Park.
- 50 km trail running + 1088 m ascent
- Sun 19 Apr
- £22-£34
Who You Going To Call? - Northampton | 50K
Come and join in for the Who You Going To Call? event! Whether you run 3km or for the whole 7 hours, you will earn yourself one of the incredible medals to celebrate your achievement!!
- 50 km trail running
- Sat 25 Apr
- £52.50
North Wales 50K
This event gives participants the opportunity to take in a runnable, beautiful route which follows the North Walian coastline between Prestatyn and Bangor.
- 50 km trail running + 2700 ft ascent
- Sat 25 Apr
- £45-£50
Calderdale Way Ultra | 30 Mile
Set in the heart of the West Yorkshire moors, this 30-mile ultra is the perfect addition to the spring running calendar with its open moorland, woodland trails, canals and scenic views.
- 30 miles trail running + 4708 ft ascent
- Sun 26 Apr
- £23-£35
The Nearly But Not Quite London Marathon | Wales | 50K
Didn't get a ballot entry into The London Marathon? Don't panic, come and experience this 50K event instead and earn a fantastic London-themed medal!
- 50 km trail running
- Fri 1 May
- £15-£27
Midweek Chasing Numbers May | 50K
The aim of the midweek runs is to hold events as cheaply as possible in order for people to be able to build their numbers or simply to help people achieve their own goals at an affordable price.
- 50 km trail running
- Sat 2 - Sun 3 May
- £39-£199
Isle of Wight Ultra Challenge
Great challenges need great settings, and up to 2,000 adventurers will take on the Isle of Wight stunning coastal path – all out to push themselves further this year!
- Trail run 3
- 50K ultra run 3
- 100K ultra run 2
- Ultra run
- Sun 3 May
- FREE-£120
Ultra X Scotland | 50K
Join Scotland’s biggest ultramarathon! Take on a true wilderness running adventure through the Scottish Highlands, with flexible distances and an unforgettable expedition feel.
- 50 km trail running + 1381 m ascent
- Mon 4 May
- £15-£27
Bank Holiday Madness May
This Bank Holiday event is run as cheaply as possible in order for people to be able to build their numbers or simply to help people achieve their own goals at an affordable price.
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 10 May
- £55
Something Wild Festival | Summit Wild Ultra
A stunning ultra trail race taking in the South West Coast Path on a fully-marked route with chip timing and eco medals for all, as part of the festival weekend!
- 50 km trail running
- Sun 10 May
- £60
Shires and Spires | Ultra
The circular 35 mile ultra is a registered UTMB index race with 20.2 miles of cross country trails and 14.3 miles on road through wonderful countryside. Fully tracked and interactive
- 35 miles multi terrain running + 2052 ft ascent
- Sun 10 May
- £23-£35
The Spring Lucky Dip Run | 50K
Come and join the Spring Lucky Dip Run! There is no set medal for this race; instead, you will get to choose your own from a selection of medals from past events!
- 50 km trail running
- Sat 16 - Sun 17 May
- £39-£199
Jurassic Coast Ultra Challenge
Walk, jog or run along the spectacular UNESCO World Heritage coastline from Corfe Castle past Lulworth Cove and Durdle Door, with full support, welcoming base camp and finish line celebration!
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Ultra run
- + 1 more race
- Sat 16 May
- £23-£35
Rocky at 50 Run | 50K
Come and celebrate 50 years since the release of the iconic Rocky film! Have you got the Eye of The Tiger, the guts to get the glory and the will to rise up to the challenge and run 50K?
- 50 km road running
- Sun 17 May
- £85
Keswick Mountain Festival | adidas TERREX 50K Trail Ultra Marathon
The ultra is graded ‘very hard’ and one to get into your ultra running calendar if you’re looking for UTMB index runs where you can bag points. Includes Full Weekend Festival Ticket in the price!
- 50 km trail running + 1800 m ascent
- Thu 21 May
- £15-£135
Dun Holm Challenge | Day 1
Whether you are a Durham resident, you just love the area, or you fancy running along the River Wear with views of the Cathedral, then this is the run for you! Themed medal too!
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 4 more races
- Fri 22 May
- £17-£29
Dun Holm Challenge - Day 2 | 50K
Whether you are a Durham resident, you just love the area, or you fancy running along the River Wear with views of the Cathedral, then this looped 50K is for you! Durham-themed medals too.
- 50 km trail running
- Sat 23 May
- £15-£29
Dun Holm Challenge | Day 3
Whether you are a Durham resident, you just love the area, or you fancy running along the River Wear with views of the Cathedral, then this is the run for you! Durham-themed medal too.
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sat 23 May
- £33-£38
Farmmageddon | Ultra Marathon
Can you survive Farmmageddon? Run an ultra over a fantastic 5.3K loop through the lovely grounds of Hyde Hall Farm as part of the Farmmageddon endurance weekend.
- 32 miles trail running
- Sat 23 May
- £22-£34
Catch Me If You Can - Northampton | 50K
Come and join in for the Catch Me If You Can event!
- 50 km trail running
- Sun 24 May
- £22-£34
Slow and Steady Wins The Race - Northampton | 50K
Come and join in for the Slow and Steady Wins The Race event!
- 50 km trail running
- Sun 24 May
- £17-£29
Dun Holm Challenge | Day 4 | 50K
Whether you are a Durham resident, you just love the area, or you fancy running along the River Wear with views of the Cathedral, then this looped 50K is for you! Durham-themed medals too.
- 50 km trail running
50K ultra marathon blog
Guides, tips and advice on running a 50K ultra.
- 10 mins read
Race 101: the 13 Valleys Ultra
Introducing the 13 Valleys Ultra plus the event's shorter distance options, helping you to push your limits and get involved!
- 8 mins read
10 best ultra marathons in the UK
Take on an epic endurance challenge with one of the most popular ultra runs in the UK, from traditional fell runs to the UTMB World Series!
50K ultra marathon FAQs
Answers to the most common questions about running a 50K ultra.
A 50K ultra run is a race of approximately 31 miles, making it the shortest and most common ultra-distance event.
Yes — many runners choose a 50K as their first ultra thanks to achievable distances, generous cut-offs and supportive atmospheres.
Many 50K events are trail-based, but some use mixed terrain or looped courses. Check event details for surface and elevation.
50K ultra runs near you
Select your location for 50K ultra marathons in your area.