Spring Trail Series

Spring Trail Series

Spring Trail Series


25KM, 50KM, 75KM


Haslemere, Surrey








12 APRIL 2025









 The Spring Trail Series takes place on the Serpent Trail, a stunning route that weaves through the greensand hills, rivers, woodland, and lowland heath of the South Downs National Park.

The Spring Trail Series offers three event distances: 75km, 50km and 25km.

As is always the case with Ultra X events, these are far more than just races, they are awesome experiences. At the start/finish there will be an expo selling merchandise, hot drinks, food and much more. You are actively encouraged to stay on after your race and enjoy the festivities, BBQ and bar.

Runners and walkers will be able to purchase camping at the event village for the Friday and Saturday night at registration.

All races are held under full UK Athletics permit granted through the TRA.





From £95





From £75





FROM £45

Previous Events

What happens when you register

Once you have registered for a race;

You will be sent an email inviting you to a call with a member of our team. This is by no means mandatory but it will allow you to ask us any questions you may have regarding the event, training, food, equipment and anything else at all.

You will be asked if you would like to be added to the competitor Facebook group. Of course you do not have to but they are a great way to get to know your fellow competitors before you reach the start line.

Cut offs

We have very relaxed cut-offs. To us, it’s not about what time you get, it’s the adventure you have along the way. On average you will have 2hrs to complete each 10km (in-between checkpoints).

If you don’t finish

In the scenario that you cannot finish a stage at one of our events, you will be offered entry into the following edition of the race at half price. You will not receive a finishers medal or official result.

What’s Included

Race entryTick
Fully marked courseTick
Medical support throughout the eventTick
Fully stocked aid stations on course and hot water for preparing food at the campsiteTick
Ground assistance and full safety supportTick
Opportunity to purchase event photographyTick
UTMB World Series Indexed race (50k and 20k categories)Tick
Finisher’s medalTick
Travel to HaslemereCross
Personal food, kit and equipment (see kit list below)Cross
Comprehensive insurance (to cover cancellations, loss of items, injury etc)Cross
Training costsCross
Spending moneyCross
Transport home for runners who are disqualified or withdraw earlyCross
Accomodation before and after the event (option to purchase at checkout)Cross

Register from

£45 TO £95

Experience The South Downs 

We understand that competitors may wish to travel to the South Downs with family or friends. Should they wish to enjoy the South Downs National Park while you race, we highly recommend visiting the following sights. Alternatively, you can visit them together after the event.

If one of your party would like to volunteer at the race while you take part, they can complete the Volunteer Application Form and we will do our best to accommodate them.

As part of the ‘Pounds for the Downs’ scheme, Ultra X are donating £1 per participant to the South Downs National Park Trust, which invests in projects that protect and enhance special places like the Serpent Trail. We are also encouraging participants to make a further voluntary donation, which can be added at checkout.

Arundel Castle

A restored and remodelled medieval castle established by Roger de Montgomery on Christmas Day in 1067.

Kingley Vale

This National Nature Reserve contains a grove of ancient trees which are among the oldest living things in Britain.

Seven Sisters Country Park

Now one of the most picturesque views in the world, the Sisters were created when ancient rivers cut valleys into the chalk.

What others say

“The Spring Trail Series 50km was such a great event. For many of us it was the first race back after a long hiatus and in true Ultra X style it did not disappoint. Fabulous course, incredible support from all the staff and volunteers but most importantly, it’s the Ultra X running community that makes it such a warm and accepting environment regardless of your background.”

Renee McGregor


“The Spring Trail Series 100km in April was the first time I’d entered a race organised by Ultra X and I can’t speak highly enough of the event, the route, and organisation behind it. From the moment you enter, through to the regular detailed updates and the race itself you can tell how much thought and planning has gone into it, really impressive and means that as a runner all you need to think about on the day is putting one foot in front of the other and having fun! Whenever I spoke to a member of staff or volunteer they couldn’t do enough to help, did so with a smile which created such a welcoming atmosphere that perfectly captures what trail running should be about. Ultra X have set the benchmark for how a trail race should be run!”

Paul Dunstan


“The mini 21km trail run I did was the absolute highlight of the month, the Ultra X team did such a great job in helping us not only to prepare but to anticipate in every way in advance. The race was just perfect – great location, great transport connection, fantastic atmosphere which eventually attracted fantastic runners.”

Zita Galantai


“The Spring Trail Series had everything you could ever want from a trail run. From the views to the vibes, this Ultra X event, as usual, didn’t disappoint! Starting and finishing from the same point, the location was perfect, and the course sublime. Plenty of runnable trails, and a good helping of mud to keep it fun! 10/10 – would run again!”

James Cooke


Ultra X