Welcome to yellow belly ultras

Discover the raw beauty of Lincolnshire through our diverse range of ultra marathons and trail running events. From scenic routes winding through the Lincolnshire Wolds to the ultimate endurance test of our Backyard Ultra, we provide the challenges, and you bring the grit. But we are more than just race day, we are a community. Join us for our free social trail runs throughout the year and experience the ethos that drives us "Always one step further".

More about us
Yellow belly lincolnshire ultramarathon

Our Trail Running Races

View our Lincolnshire trail running races and ultramarathons below.

“Always one step further”

What our runners say

I took part in the yellow belly 50 mile ultra in Feb 2026 (Winter Edition) and it was an absolutely fantastic event. The start venue was in a village hall which was nice and warn, toilet facilities and a great start point The course was a lovely undulating route with great support from volunteers and the checkpoints were fully stocked. The medal is really nice and a proper heavy one. Id highly recommend Yellow Belly Ultras as they are a fantastic company. Will definitely be running with them in the future

Owen Goldsmith

I have done the Yellow Belly Winter 50 miler and also their Backyard Ultra at the weekend. I can't fault this lovely Lincolnshire based running company. You are made to feel welcome from start to finish. As soon as you get your number at registration and even after the running event has finished. Checkpoints are all well stocked with a good mix of liquids, sweet and savoury snacks. Volunteers are always positive, helpful and encouraging. I am so happy Lincolnshire Wolds is on the map now. Its not flat at all. Lots of rolling hills and so much to see. You will never regret doing an event with them. Would highly recommend and I will be back whether that would be as a runner or volunteer

Ruth Jackson

I’ve taken part in several ultra marathons put on by different organisers, and they’ve all been great in their own way. But something about Yellow Belly Ultra events really stood out. They’re local, and they showcase some of the incredible trails the Lincolnshire Wolds have to offer. These events have everything that matters: beautiful scenery, challenging routes, great organisation, fantastic support and, of course, those big, brilliantly designed medals!

Phil

I'm a huge fan of the Yellow Belly ultramarathon and trail races. they're exactly what a trail event should be, raw and authentic without feeling over commercialised! The organisation was spot on and there's a genuinely supportive community feel from start to finish.

Ash

Really friendly, loads of fruit, savoury/sweet refreshments, hot and cold water/soft drinks in the start and finish tent. Well kept and clean toilets. Challenging, yet beautiful undulating course. Loved the fire pit to warm up between laps at night on the backyard ultra. The medal is epic and you're given a beer at the end - highly recommend!

Karen Evelyn

Yellow Belly FAQs

Are all yellow belly events in Lincolnshire?

Are your ultra marathons suitable for beginners?

Why is the company called Yellow Belly Ultras?

Proudly Partnered With

Inov8
Highland Fuel Nutrition
The Lincolnshire Runner
Cooked Concept Bespoke Brewing
The Shop - South Elkington
GB Ultra Runner
Tea and Trails
How to become a sponsor