50k Ultra Marathons UK

There are several reasons why the 50k is the most popular ultramarathon distance:

• The Perfect Step Up: At just 5 miles longer than a traditional marathon, it’s an achievable milestone for anyone who has conquered the 26.2 mile distance.
• Incredible Scenery: Unlike city road marathons, most 50k ultramarathons UK organizers route their races through National Parks, woodlands, and coastal paths.
• Community Vibe: The ultra-running community is famously supportive. Checkpoints (aid stations) are less about grabbing water on the run and more about fuelling up with snacks, interacting with volunteers, and pacing yourself.

Each of the 50k ultra marathons listed above includes the total elevation gain figures. You can also use the elevation filter to quickly narrow down your options based on your preferred vertical challenge.

The overall race cut-off time is provided on all the ultra marathons listed above. To assess achievability, compare the required average pace to your typical long-run pace on similar terrain. You can also use our helpful running pace calculator to work out the slowest running pace required to meet the cut-off time.

50k ultras are often considered the entry point into the world of ultra-running so most are beginner-friendly, however some more of the popular events may have qualification requirements (e.g. completing a previous marathon or ultra within a certain time). If you're new to ultras, the 50k distance is a great starting point as it's only ~8km longer than a standard marathon!

Standard entry fees for 50k ultra marathons usually cover race entry, course support (aid stations, medical personnel), a finisher's medal and sometimes race swag like a t-shirt. Some events may include transport to the start, post-race meals or professional photos. For full details of what's included it's strongly recommended to check the official race website.

Yes, a 50km (31 miles) ultra is widely considered the perfect entry point into ultra running. It is only 5 miles (8km) longer than a standard marathon, making the step up in distance physically and mentally manageable for most runners. Unlike longer distances (50 miles or 100km), a 50k can often be completed without a dedicated support crew, relying solely on race aid stations. It offers the challenge of going beyond the marathon without the extreme sleep deprivation or gear requirements of longer events.

While the distance is similar, the difficulty often lies in the terrain rather than the mileage. If your 50km is on trails, you will face elevation gain, technical footing, and potentially slower distinct paces compared to a flat road marathon. However, the culture of ultra running is generally more relaxed; walking the uphills (power hiking) is standard practice and helps conserve energy. Most runners find that while a 50km takes longer to complete than a road marathon, the physical impact on the joints can sometimes be lower due to the softer ground and varied muscle usage.

If you currently have a solid base of running (running 20–30 miles per week consistently), most runners can train for a 50km in 12 to 16 weeks. Your training plan should focus less on specific mile splits and more on time on feet. Key elements of a 50k training block include back-to-back long runs (a long run Saturday followed by a medium-long run Sunday) to simulate running on tired legs, and specific hill training if your chosen race has significant elevation gain.

Unlike shorter road races, you generally need to carry specific equipment to remain safe and fuelled. While you can view our comprehensive Ultra Marathon Kit List here for specific brand recommendations, the essential items usually include:

• Hydration Vest: A pack to carry at least 1-1.5 litres of water and nutrition comfortably on your back.
• Trail Shoes: Footwear with deeper lugs (grip) designed for traction on mud, rocks, and uneven terrain.
• Nutrition: Enough gels, bars, or real food to consume roughly 200-300 calories per hour.
• Mandatory Kit: Depending on the weather and race rules, you may be required to carry a waterproof jacket, a whistle, and a foil blanket. Always check the specific race rules for the mandatory kit list.

A 50k race is approximately 31.06 miles. It is the shortest recognised ultramarathon distance, making it roughly 5 miles longer than a standard marathon.

Finish times for 50k ultras in the UK vary wildly depending on the terrain and elevation. A flat trail 50k might be completed by average runners in 4.5 to 6 hours, whereas a mountainous 50k in Snowdonia or the Scottish Highlands could take anywhere from 6 to 9 hours.