Borders 8-hour Challenge (NU Limits Running)
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Event and format
The Borders 8-hour Challenge takes place on 05 September 2026 at Rock UK / Borders Forest Park, Newcastleton. Participants complete as many 4.366 mile trail loops as possible within an 8-hour time limit. Each lap includes about 480 ft of ascent. Final-lap rules require runners to begin their last lap before 7:59:59 hours of race time and to complete any final lap by 9:00:00 hours of race time.
Distances by lap count:
- 3 laps = Half Marathon
- 6 laps = Full Marathon
- 7+ laps = Ultra Marathon
The route is on trail paths around Borders Forest Park and a GPX file is available for full route details.
Logistics and rules
Entries are open with a capacity of 200 places. Standard entry until 02 September 2026 is £44.95; a service fee of 4% (minimum 50p) applies. Parking at Rock UK is managed by marshals; charges are £5 per day and £15 per night for campervans/campers, with overnight access to water and toilet facilities.
Timing uses electronic wristbands (HuTags on velcro straps) that record lap start and finish times. Runners must not cover the tag and should check out with the timing partner to finalise lap counts and finish times. Basecamp is marked on the GPX map and offers storage (organiser not liable), two outdoor gazebos, an indoor hall, and onsite catering. Mandatory kit includes sufficient nutrition and hydration (minimum 500 ml fluid per hour; 60-90 g carbohydrates per hour), appropriate clothing, dry clothes, a mobile phone, and a headtorch. Accommodation options are offered with prices quoted for two nights. Volunteers are used and are eligible for a free entry reward. Visit the organization's website for the most recent information.
