- Source: Greyrock Mountain National Recreation Trail
- Greyrock Mountain National Recreation Trail
- Round Mountain National Recreation Trail
- Rocky Mountain Arsenal National Wildlife Refuge
- Mineral Belt National Recreation Trail
- List of protected areas of Colorado
- Greyrock Mountain
- Mount McConnel National Recreation Trail
- Curecanti National Recreation Area
- Calico National Recreation Trail
- Larimer County, Colorado
Greyrock Mountain National Recreation Trail is a hiking trail in Roosevelt National Forest west of Laporte, Colorado. The trail was constructed by the Civilian Conservation Corps in the 1930s and designated as a National Recreation Trail in 1979.