The Fox Valley Marathon is a road-racing event in the Fox River Valley of Illinois offering marathon, half-marathon, Fall Final 20, and 5K distances. The mostly flat, fast course starts and finishes in historic St. Charles and winds through Geneva, Batavia, and North Aurora, with a scenic finish along the Fox River. The race is noted for its small-race charm combined with big-race amenities, supportive volunteers, and pre-race expo and post-race celebrations that appeal to both seasoned runners and first-timers.