Big River Running Company is proud to host the 13th annual Castlewood Cup, and it’s return to Castlewood State Park. The race will cover 15km of Castlewood’s finest single track and will be a true test of trail running with a course that includes uphills, downhills, and switchbacks.

The final leg of the Big River Trail Series, and maybe the most challenging and fun. Come conquer the frozen trails with us and make hay toward your spring running goals!