Outdoors and wildfire - Front Range
Red Mountain Open Space closes in winter for wildlife and bans dogs
Red Mountain Open Space, a large area of red rock and grassland near the Wyoming line, is open only part of the year to protect wintering wildlife, and it does not allow dogs.
Published June 10, 2026 - Last verified June 15, 2026
Red Mountain Open Space lies well north of Fort Collins, up near the Wyoming border, and it looks different from the foothills closer to town. Deep red and tan rock formations rise out of rolling grassland and sandy washes, and the area is known for its geology. There are miles of trails open to hikers, bikers, and horseback riders.
Two rules set it apart, and both are worth knowing before you drive out. First, it is open only part of the year. The open space closes in winter to protect big-game animals that depend on this lower ground as winter range, when food is scarce and disturbance is costly to them. So a winter visit is not an option; check the current open months before going. Second, this is a dog-free open space. Dogs are not allowed at all, which surprises people used to bringing a dog to county trails.
Access is by a county road, and the county’s directions note there is no entry from some nearby roads and highways, so use the official directions to find the right trailhead.
To confirm the current open season, directions, and rules, see the Larimer County Red Mountain Open Space page before you make the drive.