Now in its 6th year, the Old Man Winter Rally is an epic winter adventure for cyclists and runners in the Rocky Mountains. The event offers two bike course options. The 50km route tours some of the scenic, rolling terrain that has made Boulder County, CO one of the country’s most popular gravel riding destinations. The 100km ride starts with the same country riding as the 50km course before sending cyclists on a roller coaster route of climbs and descents through the snow-filled canyons west of Boulder. The event also offers a 10km running race and a Run/Bike combo that is popular for multi-sport athletes. All participants are supported with well-stocked aid stations and a huge after party with hot food, fire pits, and cold beer.