The Tweed Valley Ultra begins and ends at Glentress Peel Visitor Centre near Peebles, with registration at the Glentress Peel cafe. This multi-terrain trail ultra takes place in Tweed Valley Forest Park, with 50k and 65k options. It is the main event of a trail-running weekend that also features a winter half marathon and 10k. The 65k race follows the 50k route and adds a 15k loop, meaning both distances offer a similar forest and hill environment.
The course incorporates secluded paths, forest tracks, riverside trails along the River Tweed, winding hill paths, and short road or connector sections. A portion crosses the Southern Upland Way between Traquair and Three Brethren Cairn. Participants should anticipate a challenging, undulating course. One runner's account details an initial steep 600ft climb within a forest section, followed by a descent to a brief main road segment, and then another steep 600ft ascent back into the forest before reaching a checkpoint on a country road.