The Boulder Rez Marathon is quickly becoming a Boulder classic! This isn’t just another run around the lake. September temperatures will create the perfect race atmosphere. BBSC will offer a Marathon, ¾ Marathon, Half Marathon, 10K and relay, guaranteeing the perfect distance for you! This popular course will take runners around the Boulder Reservoir on some stunning single tracks, packed-dirt trails, and paved park roads at the start and finish line. After your race enjoy the lively post-race atmosphere with music, awards, beer, food and more!