Colorado

Colorado racing is defined by altitude and scenery. In May, the Colorado Marathon descends Poudre Canyon into Fort Collins, and Denver's Colfax Half runs the city's longest street at a mile high. In August, the Pikes Peak Marathon climbs roughly 7,800 feet from Manitou Springs to the 14,115-foot summit and back, and the Pikes Peak Ascent climbs about 13 miles to the top. Because most Colorado courses sit at elevation, plan for slower times than at sea level and arrive a few days early if you can.