From the field at Harcourt Hill you head west across the top of Cumnor Hill, then drop to the valley and climb through Hen Wood, past the Scout camp at Youlbury, to the top of Boars Hill. That is the hard work done by 3.5 km.
The middle of the race rolls along the ridge near Jarn Mound, with water waiting at 4.7 km, before a long descent to Chilswell Farm. The last third follows the Oxford Greenbelt Way back up the valley, with Oxford spread out on your right.
Underfoot it is bridleway, gravel track and field path, with short stretches of pavement and quiet lane. Trail shoes help after rain; road shoes are fine in a dry September.
Download the GPX
The map and GPX are an indicative trace of the 2026 course, good to about 30 metres. On the day, follow the signs and the marshals. The 2027 course is subject to the usual permissions.