- Above Timberline
 - Field guide to the Sangre de Cristo and Wet Mountains of southcentral Colorado. Includes wildlife, habitats, local and recreational information. - Aiken Audubon Society
- Includes a newsletter, press releases, and more.
- American Birding Association
- Encourages conservation of birds and their habitats by developing and disseminating information, and promoting economic and environmental values of birding.
- Arapaho & Roosevelt National Forest
- Offering a variety of outdoor recreational opportunties.
- Arkansas Valley Audubon Society
- Aspen Ranger District
- Provides a guide to recreation activities including skiing, backpacking, camping, horseback riding, and more in the White River National Forest.
- BigGameHunt.net
- Includes international directory, photos, recipes, classifieds, guides, and outfitters.
- BigTrout.com
- Guide to flyfishing in Colorado, including river conditions, hatch reports, river descriptions, and more.
- Black Canyon of the Gunnison National Park@
- Black Forest Observatory
- Offers sky tours by private reservation and resources on BFO's educational space mission.
- Boulder Rock Club
- Offering indoor and outdoor training and events.
- Boy Scout Troop 97
- Cave of the Winds
- Offering tours and a laser show.
- Colorado B.A.S.S. Federation
- Features membership information, list of state chapters, schedule of events and tournaments, and more.
- Colorado Birding Society
- Nourishes interest in birds, other wildlife, and valuable habitat by providing lectures, bird trips, and birding classes.
- Colorado Dude Ranch Vacation
- A group of 5 from South Carolina make their first trip to a Dude Ranch near Gunnison, Colorado.
- Colorado Fourteeners
- Contains pictures of Colorado's fourteeners, other peaks, and wildlife photos.
- Colorado Guide
- Growing database of trails, lakes, parks, camping grounds, forests, wilderness areas, accommodation, and more.
- Colorado Huntin
- Includes a directory of manufacturers, starting dates and fees information, trophy gallery, and more.
- Colorado Landsailing and Iceboating
- Contains a picture gallery, chat room, information on sailing locations, and more.
- Colorado Mountain Club
- Organised to unite the energy, interest, and knowledge of the students, explorers, and lovers of the mountains of Colorado.
- Colorado Outdoor Education Center@
- Colorado Outdoor Recreation
- Colorado's national parks, forests, wilderness areas, wildlife refuges, monuments, listings of outdoor recreation and travel opportunities.
- Colorado Outward Bound School
- Offers wilderness courses on rivers, oceans, mountains and deserts in the West all year round.
- Colorado Rocky Mountains Trip Report (CRMTR)
- Collection of personal hiking accounts from 1970 to the present.
- Colorado Snowmobile Association
- Created to promote and protect the sport of snowmobiling in Colorado. Includes club information, trip planner, trail reports, and news.
- Colorado State Parks
- Colorado Trail
- High mountain educational and recreational hiking trail stretching from Denver to Durango.
- Colorado White Water Association
- Nonprofit group dedicated to kayaking and rafting in the Rockies.
- Colorado Wilderness
- Provides information on Colorado's wilderness areas and links to state and federal sites pertaining to these areas.
- Colorado14er.com
- View statistics, hike times, and photos of these mountains.
- Colrado Fishing Guide
- Includes reports, maps, business links, and more.
- Curecanti National Recreation Area
- Complex of lakes, mesas and canyons in Colorado offering hiking, fishing, scenic driving and a wide variety of water sport opportunities. Headquartered in Gunnison.
- Denver Sailing Association
- One-design sailing club in Colorado.
- Dinosaur National Monument@
- Dinosaur Ridge
- Geologically famous National Natural Landmark, located along the Rocky Mountain Front Range, features Jurassic dinosaur bones and Cretaceous footprints.
- Explorer Post #493
- Emergency management.
- Florissant Fossil Beds National Monument - U.S. National Park Service
- See petrified redwood stumps up to 14 feet wide and thousands of detailed fossils of insects and plants that reveal the story of a very different, prehistoric Colorado.
- Front Range Bouldering
- Offers data on local climbing areas.
- Garden Of The Gods Visitor Center
- Provides information on visiting the park, group tours, educational programmes, coupons, volunteer opportunities, and more.
- Girl Scouts - Wagon Wheel Council
- Serves girls in eight Colorado counties.
- Girl Scouts Mile Hi Council
- Denver-based Girl Scout chapter.
- Grand Mesa, Uncompahgre & Gunnison National Forests@
- Great Sand Dunes National Monument@
- Hiking in Colorado
- Listing and descriptions of several high altitude hikes in the Rocky Mountains of Colorado.
- Historic Arkansas Riverwalk of Pueblo
- Pedestrain pathways, bike paths, river boat rides, and events on the Arkansas River in Colorado.
- Hovenweep National Monument@
- International Gay Rodeo Association
- Listings of upcoming rodeos with dates, locations and "hot line" numbers.
- Mesa Verde National Park@
- Mount Evans@
- National Sports Center for the Disabled
- Provides recreation and competitive opportunities for children and adults with disabilities. Activities include skiing, horseback riding, camping, rock climbing, plus education and outreach programmes.
- Ouray Ice Park@
- Colorado park devoted exclusively to ice climbing.
- Outpost Wilderness Adventure
- Private guiding, organised group clinics, and summer youth programmes.
- Pike & San Isabel National Forests@
- Pikes Peak Council
- Pikes Peak Group, Sierra Club
- Poudre River Trail
- A 22-mile long trail that will extend from Island Grove Regional Park in Greeley, Colorado to the Weld/Larimer County Line along the Cache La Poudre River.
- Red Rocks Park and Amphitheater@
- Rio Grande National Forest@
- Rock Climbing in and Around Boulder
- Growing database dedicated to rock climbing in Boulder Canyon, Eldorado, the Flatirons, Castlewood, Table Mountain, and other locales.
- Rocky Mountain Angling Club
- Offers members access to catch-and-release fly-fishing along private rivers, streams, and ponds in Colorado and Wyoming.
- Rocky Mountain National Park@
- rsgeek's Colorado Geocaching Resource Pages
- Offers a geocaching FAQ, a collection of regulations on caching in Colorado public lands, downloadable tools, and links.
- Sailing Association of Intermountain Lakes (SAIL)
- Local represenation to the U.S. Sailing Association for Colorado, Wyoming, New Mexico and Western Nebraska promoting sailing and Yacht racing.
- San Juan National Forest@
- Sanborn Western Camps
- With the Big Spring Ranch for boys and High Trails Ranch for girls.
- Schussbaumer Ski Club
- Denver-based year round ski club with a chalet in Breckenridge.
- Southwest Colorado Travel Guide
- Contains information and images from major National Parks and Monuments in southwest Colorado.
- Spanish Peaks Scout Ranch
- Boy Scout summer camps located near Walsenburg, Colorado and Ford County Lake, Kansas.
- Suite101.com: Hiking Colorado Trails
- Archive of articles and web sites.
- Take a Hike
- Features easy, intermediate, and difficult hikes around the Denver area.
- Tenth Mountain Division Hut Association of Colorado
- System of huts located in the mountains between Aspen, Leadville, and Vail. In the alpine tradition of hut-to-hut travel, 24 huts provide overnight shelter for seasoned backcountry skiers and riders, snowshoers, mountain bikers, and backpackers.
- Trails and Open Space Coalition
- Nonprofit organisation working to preserve and create trails throughout the Pikes Peak region.
- Tree Climbing Colorado
- Resource for recreational tree climbing and tree climbers in Colorado and elsewhere.
- Troop 345
- Troop 362, Girl Scouts of the USA
- Troop 4
- Uncompahgre National Forest
- With basecamps in Telluride and Ouray, offers wilderness hiking trails, mountain biking, fishing, scenic driving, and climbing.
- White River National Forest@
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