- Abyss Lake Scenic Area
- Adler-Fingru Open Space
- Admor Open Space
- Adobe Badlands Wilderness Study Area
- Aiken Canyon Preserve
- Alamosa National Wildlife Refuge
- Alkire Greenbelt
- American Flats Wilderness Study Area
- Ant Hills Wilderness Study Area
- Aquarius Open Space
- Arapaho Bend Natural Area
- Arapaho National Forest
- Arapaho National Recreation Area
- Arapaho National Wildlife Refuge
- Arkansas Headwaters Recreation Area
- Aspen Center for Environmental Studies
- Baca National Wildlife Refuge
- Bent's Old Fort National Historic Site
- Bergen Peak State Wildlife Area
- Big Dry Creek Open Space
- Bill Hare Gulch Wilderness Study Area
- Black Canyon of the Gunnison National Park
- Black Canyon of the Gunnison Wilderness
- Black Canyon Wilderness Study Area
- Black Mountain Wilderness Study Area
- Black Ridge Canyons Wilderness
- BLM - Animas City Mountain
- Bluff Lake Nature Center
- Bobcat Ridge Natural Area
- Bodo SWA
- Boedecker Bluff Natural Area
- Boise Bend Natural Area
- BOR - Lake Nighthorse Recreation Area
- Bowen Gulch Protection Area
- Bowes Open Space
- Browns Canyon National Monument
- Browns Canyon Wilderness Study Area
- Browns Park National Wildlife Refuge
- Buffalo Peaks Wilderness
- Bull Canyon Wilderness Study Area
- Bull Gulch Wilderness Study Area
- Bullhead Gulch Open Space
- Butterfly Woods
- Button Rock Preserve
- Byers Peak Wilderness
- Cache La Poudre Wilderness
- Camel Back Wilderness Study Area
- Camp Hale - Continental Divide National Monument
- Canyons of the Ancients National Monument
- Carolyn Holmberg Preserve at Rock Creek Farm
- Castle Peak Wilderness Study Area
- Cathy Fromme Prairie Natural Area
- Cattail Chorus
- Chew Winter Camp Wilderness Study Area
- Cheyenne Mountain State Park
- Chimney Rock National Monument
- Classification Natural Resource Protection
- Clear Spring Ranch Park
- Clifton Nature Park
- Coal Creek Open Space
- Colina Mariposa Natural Area
- Collegiate Peaks Wilderness
- Colliers Hill
- Colorado National Monument
- Comanche Peak Wilderness
- Concrete Coyote
- Confluence Park
- Cottonwood Hollow Natural Area
- Cottonwood Run Natural Area
- Country Club Village Open Space
- Country Club West Natural Area
- Country West Greenbelt
- Coyote Ridge Natural Area
- Cozens Ranch Open Space
- Cross Mountain Wilderness Study Area
- Crow Valley Recreation Area
- Cucumber Gulch Preserve
- Curecanti National Recreation Area
- Dad Clark Natural Area
- Davidson Mesa
- Demaree Canyon Wilderness Study Area
- Devils Backbone Open Space
- Diamond Breaks Wilderness Study Area
- Dinosaur National Monument
- Dolores River Canyon Wilderness Study Area
- Dominguez Canyon Wilderness
- Dominguez Canyon Wilderness Study Area
- Dominguez-Escalante National Conservation Area
- Douglas Mountain Study Area
- Eagle Mountain Wilderness Study Area
- Eagle View Natural Area
- Eagle Vista Natural Area
- Eagles Nest Wilderness
- East Big Dry Natural Area
- East Fork Natural Area
- Eldorado Canyon State Park
- Emerald Glen Natural Area
- Erie Commons
- Erie Highlands
- Esmail Open Space
- Farmers High Line Canal Open Space
- Fischer Natural Area
- Fishers Peak State Park
- Flat Tops Wilderness
- Florissant Fossil Beds National Monument
- Fossil Creek Reservoir Natural Area
- Fossil Creek Wetlands Natural Area
- Fossil Ridge Recreation Management Area
- Fossil Ridge Wilderness
- Fountain Creek Regional Park
- Gallery Green Natural Area
- Gateway Lakes Natural Area
- Gateway Natural Area
- Glenmere Urban Wildlife Sanctuary
- Golden Gate Canyon State Park Green Ranch
- Grandview Open Space
- Great Sand Dunes National Park
- Great Sand Dunes National Preserve
- Great Sand Dunes Wilderness
- Greenhorn Mountain Wilderness
- Greenlee Wildlife Preserve
- Gunnison Gorge National Conservation Area
- Gunnison Gorge Wilderness
- Gustav Swanson Natural Area
- Hack Lake Wilderness Study Area
- Handies Peak Wilderness Study Area
- Hartman Rocks
- Haviland Lake SWA
- Hazaleus Natural Area
- Hermosa Creek Special Management Area
- Hermosa Creek Wilderness
- High Mesa Grassland Instant Study Area
- Holy Cross Wilderness
- Homestead Natural Area
- Horsetooth Mountain Open Space
- Hot Sulphur Springs State Wildlife Area
- Hovenweep National Monument
- Hunter–Fryingpan Wilderness
- Indian Peaks Wilderness
- James Peak Protection Area
- James Peak Wilderness
- Josephine Jones Natural Area
- Josephine Roche Open Space
- Kingfisher Point Natural Area
- Kings Crossing Natural Area
- Kipling Villas Greenbelt
- Kneebone Open Space
- Knoll-Willows Open Space
- La Garita Wilderness
- Lac Amora Open Space
- Lagerman Agricultural Preserve
- Lakeview Tributary Open Space
- Leon Wurl Wildlife Sanctuary
- Lions' Open Space
- Little Book Cliffs Wilderness Study Area
- Lizard Head Wilderness
- Lone Mesa State Park
- Long View Farm Open Space
- Lookout Mountain Preserve and Nature Center
- Lost Creek Wilderness
- Lowell Ponds Wildlife Area
- Lower Grape Creek Wilderness Study Area
- Magpie Meander Natural Area
- Mallard's Nest Natural Area
- Mariana Butte Natural Area
- Marolt Open Space
- Maroon Bells–Snowmass Wilderness
- Maxwell Natural Area
- Mayhofer Open Space
- McInnis Canyons National Conservation Area
- McIntyre Hills Wilderness Study Area
- McKay Lake Open Space
- McKenna Peak Wilderness Study Area
- McMurry Natural Area
- Meadowbrook Natural Area
- Medina's Crossing Natural Area
- Menefee Mountain Wilderness Study Area
- Mesa Open Space
- Mesa Verde National Park
- Mesa Verde Wilderness
- Mesa Wildlife Preserve
- Metzger Farm Open Space
- Meyer Ranch Park (Area Closed)
- Middle Fork Natural Area
- Monte Vista National Wildlife Refuge
- Moore Open Space
- Morey Wildlife Reserve
- Morrison Nature Center
- Mount Evans Wilderness
- Mount Massive Wilderness
- Mount Sneffels Wilderness
- Mount Zirkel Wilderness
- Namaqua Natural Area
- Narrows Park
- National Center for Atmospheric Research
- National Wildlife Refuge
- Native Grasses Restoration Study Area
- Nature and Wildlife Discovery Center: River Campus
- Needle Rock Instant Study Area
- Neota Wilderness
- Never Summer Wilderness
- Niver Creek Open Space
- North Mesa
- North Sand Hills Instant Study Area
- North Shields Ponds Natural Area
- Oil Spring Mountain Wilderness Study Area
- Old Saint Louis Natural Area
- Oxbow Natural Area
- Papa Keal Wilderness Study Area
- Park Hill Park
- Pawnee National Grassland
- Pelican Marsh Natural Area
- Perins Peak State Wildlife Area'
- Peterson Draw Wilderness Study Area
- Piedra Special Management Area
- Pineridge Natural Area
- Plaster Open Space
- Platte River Contiguous Wilderness Study Area
- Ponderosa Preserve
- Powderhorn Instant Study Area
- Powderhorn Meadows Greenbelt
- Powderhorn Wilderness
- Prairie Dog Meadow Natural Area
- Prairie Dog Preserve
- Prairie Ridge Natural Area
- Prebles Meadow Jumping Mouse
- Proghorn Nature Area
- Promntory Point Open Space
- Prospect Ponds Natural Area
- Ptarmigan Peak Wilderness
- Puente Verde Natural Area
- Quail Creek Open Space
- Raggeds Wilderness
- Ralston Creek State Wildlife Area
- Ranch Creek Open Space
- Ranch Creek Wetlands Open Space
- Rare Lizard and Snake Instant Study Area
- Rawah Wilderness
- Red Fox Meadows Natural Area
- Red Mountain Open Space
- Redcloud Peak Wilderness Study Area
- Redtail Grove Natural Area
- Redwing Marsh Natural Area
- Reservoir Ridge Natural Area
- Rim Rock Open Space
- Rio Grande Healthy Living Park
- River's Edge
- River's Edge Natural Area
- Riverbend Natural Area
- Riverbend Ponds
- Riverdale Bluffs Open Space
- Riverdale Regional Park
- Rocky Flats National Wildlife Refuge
- Rocky Mountain Arsenal National Wildlife Refuge
- Rocky Mountain Ecodharma Retreat Center
- Rocky Mountain Wilderness
- Ross Natural Area
- Rothman Open Space
- Roubideau Special Management Area
- Running Deer Natural Area
- Ruth Roberts Preserve
- Saddle Ridge Natural Area
- Salyer Natural Area
- San Luis Hills Wilderness Study Area
- San Luis Valley Field Office
- Sangre de Cristo Wilderness
- Sarvis Creek Wilderness
- Sewemup Mesa Wilderness Study Area
- Skull Creek Wilderness Study Area
- Sky Mountain Park
- Soapstone Prairie Natural Area
- Soaring Vista Natural Area
- South Republican Management Area
- South San Juan Wilderness
- South Table Mountain Conservation Easement
- Spanish Peaks Wilderness
- Springer Natural Area
- State Forest State Park
- Sunrise Creek Greenbelt
- Sunset Vista Natural Area
- Tabeguache Special Management Area
- Tanglewood Creek Open Space
- The Coterie
- The Field Open Space
- The Grove at Commons Park
- The Palisade Wilderness Study Area
- Tillman Bishop State Wildlife Area
- Topminnow Natural Area
- Trinidad Lake State Park
- Troublesome Wilderness Study Area
- Two Creeks Natural Area
- Two Ponds National Wildlife Refuge
- Udall Natural Area
- Uncompahgre Wilderness
- Upper Grape Creek Wilderness Study Area
- Vail Nature Center
- Vale of Tears Wilderness Study Area
- Vasquez Peak Wilderness
- Vista Pointe Open Space
- Walnut Creek Open Space
- Warembourg Open Space
- Warembourg-Lafayette Farms
- Watson Lake State Wildlife Area
- Weaver Park
- Weber Mountain Wilderness Study Area
- Weminuche Contiguous Wilderness Study Area
- Weminuche Wilderness
- West Big Dry Natural Area
- West Cold Springs Wilderness Study Area
- West Elk Wilderness
- West Lake State Wildlife Area
- West Needles Contiguous Wilderness Study Area
- Westbury Greenbelt
- Westminster Hills Open Space
- Wetland Preserve
- Whitehead Gulch Wilderness Study Area
- Wild Natural Area
- Wildcat Natural Area
- Willow Bend Natural Area
- Willow Creek Wilderness Study Area
- Willow Springs Open Space
- Windy Gulch Wilderness Study Area
- Yucca House National Monument