Colfax Marathon

The Colfax Marathon is an annual running event held in Denver, Colorado, recognized as Denver's only marathon and one of the largest running events in the Rocky Mountain region. It was established by the cities of Denver, Lakewood, and Aurora to honor Colfax Avenue, which is notable for being the longest main street in the United States. The event, now in its nineteenth year, has evolved to feature a full marathon, a half marathon, an urban 10-miler, a 5K, and one of the nation's largest maratho