When is the best time to see wildlife in Colorado?
Each season has a highlight. Sandhill cranes gather in the San Luis Valley in March, moose are visible in North Park year-round, the elk rut peaks in Rocky Mountain National Park in September and October, kokanee salmon run upstream near Almont in September and October, and bald eagles winter around Denver from late fall through February. Dawn and dusk are the best times of day for almost every species.
Some of the best events in Colorado have no organizer at all. They happen because an animal shows up in the same place at the same time every year.
This calendar covers the wildlife moments that are reliable enough to plan a trip around, where to see them from a road or a short walk, and the viewing rules that protect both you and the animals. Several of these events also have community festivals attached, which are listed where they exist.
Before you go
The Rules That Matter
Colorado Parks and Wildlife and the National Park Service ask for the same basic behavior everywhere:
- Keep your distance. Rocky Mountain National Park asks visitors to stay at least 75 feet, about two bus lengths, from elk and other large animals, and farther from predators. A simple test: hold out your arm and raise your thumb. If your thumb does not cover the whole animal, you are too close.
- Let the animal decide. If an animal changes its behavior because of you, stops feeding, stares, moves away, you are too close.
- Stay in or near your vehicle at roadside viewing. In Rocky Mountain National Park, elk calling and the use of spotlights or vehicle headlights to look for wildlife are prohibited, and some meadows close to people during the rut.
- Never feed wildlife. It is illegal and it gets animals killed.
- Bring binoculars. The best viewing is usually from farther away than you expect.
March to May
Spring: Cranes, Grouse And Calving Season
Sandhill cranes, San Luis Valley (March)
Every spring roughly 20,000 sandhill cranes stop in the San Luis Valley to rest and feed in barley fields and wetlands on their way north, according to the U.S. Fish and Wildlife Service, with numbers peaking in March. The Monte Vista National Wildlife Refuge and the fields around Monte Vista are the center of the action, and the birds are easiest to see at dawn and dusk as they fly between roosts and fields. The Monte Vista Crane Festival adds guided bus tours, photography workshops and talks; organizers list March 5 to 7, 2027. Seeing the cranes themselves is free.
Greater sage-grouse, northwest Colorado (late March to April)
Male sage-grouse gather on traditional display grounds called leks each spring and put on an elaborate dawn display. Because the birds are sensitive to disturbance, Colorado Parks and Wildlife has offered guided viewing near Craig from a trailer that keeps observers from disturbing the lek, with limited space and reservations required. Check CPW for whether tours are offered in a given year.
Calving and fawning season (May and June)
Elk calves and deer fawns are born in late spring. A fawn or calf alone in the grass is almost never abandoned; the mother is nearby. Leave it where it is.
June to August
Summer: Moose, Mountain Goats And Hummingbirds
Moose in North Park
North Park, the high basin around Walden, is known as the moose-viewing capital of Colorado, and State Forest State Park reports more than 600 moose observed in the area. The state's wildlife agency introduced a small group of moose to North Park in the 1970s, and the population has grown and spread from there. The park's Moose Visitor Center east of Walden is a good place to start. Look for moose in willow-lined creek bottoms early and late in the day, and give them a lot of room. Moose can be aggressive toward people and dogs, especially a cow with a calf.
Mountain goats and bighorn sheep above treeline
Mountain goats are regularly seen around Mount Blue Sky and Guanella Pass in summer, and bighorn sheep use alpine slopes across the state. Drive slowly on high roads, and do not let animals approach your car looking for salt or food.
Hummingbirds and wildflowers
July and early August are peak wildflower season in the high country, and broad-tailed and rufous hummingbirds are common visitors to mountain-town feeders. It is also peak afternoon thunderstorm season, so plan alpine wildlife watching for the morning.
September to November
Fall: The Elk Rut, Kokanee And Bighorn Rams
Elk rut, Rocky Mountain National Park and Estes Park (September and October)
Each fall, elk gather in lower-elevation meadows for the mating season. Bulls bugle, spar and gather harems, and the sound carries for miles at dusk. Moraine Park, Horseshoe Park and the meadows around Estes Park are classic viewing areas, and elk often wander through town. Rocky Mountain National Park closes some meadows to people during the rut and asks visitors to watch from roadsides. Estes Park celebrates the season with Elk Fest, held October 3 and 4 in 2026.
The rut also coincides with the park's busy fall season. Check the park's timed entry rules before you go; they apply into October. See nps.gov/romo.
Kokanee salmon run, Roaring Judy Hatchery (September and October)
Kokanee, a landlocked sockeye salmon, swim roughly 30 miles upstream from Blue Mesa Reservoir to the Roaring Judy State Fish Hatchery near Almont each fall. Colorado Parks and Wildlife says visitors can see adult kokanee, the males bright red with humped backs and hooked jaws, near the hatchery ponds in September and October. Run sizes have been low after recent drought years, so check with the hatchery before making a special trip.
Bighorn sheep, Georgetown (fall and winter)
A herd of bighorn sheep lives on the steep slopes above Georgetown, about an hour west of Denver on I-70. The viewing station near Georgetown Lake has signed access from the Georgetown exit, and fall and winter are the best seasons, when the rams clash during the rut. Watch from the viewing station rather than the highway shoulder. The Georgetown Bighorn Sheep Festival is traditionally held on the second Saturday of November.
December to February
Winter: Bald Eagles And Bison On The Plains
Bald eagles at Barr Lake State Park
Barr Lake State Park, northeast of Denver, is one of the best places in the state to see wintering bald eagles, and February is a prime month. Colorado Parks and Wildlife has counted more than 50 eagles at the lake in a season, and one quick scan once tallied more than 100. The gazebo, about a 1.3-mile walk from the nature center, overlooks a nest. A state parks pass is required.
Rocky Mountain Arsenal National Wildlife Refuge
Minutes from Denver International Airport, the Rocky Mountain Arsenal National Wildlife Refuge has a free 11-mile Wildlife Drive through grassland where a bison herd roams, along with deer, coyotes, prairie dogs and, in winter, bald eagles. The drive takes about an hour. Stay at least 75 feet from bison. See fws.gov/refuge/rocky-mountain-arsenal.
Winter range closures
Many trails and roads on the edges of the mountains close seasonally to protect elk, deer and bighorn winter range. These closures matter; animals that are pushed off winter range burn energy they cannot replace. Check the managing agency before you head out.
Common questions
Wildlife Watching Questions
When is the elk rut in Colorado?
The elk rut in Colorado runs mainly through September and into October. Rocky Mountain National Park and Estes Park are the most popular places to watch, especially at dawn and dusk. The park asks visitors to stay at least 75 feet from elk and closes some meadows during the rut.
Where can I see moose in Colorado?
North Park, around Walden in north-central Colorado, is known as the moose-viewing capital of the state, and State Forest State Park reports more than 600 moose observed in the area. Look along willow-lined creeks early and late in the day.
When do sandhill cranes come to Colorado?
Sandhill cranes stop in the San Luis Valley each spring, with numbers peaking in March. The Monte Vista National Wildlife Refuge area is the best place to see them, and the Monte Vista Crane Festival is held in early March.
Sources
- National Park Service: Watching elk in Rocky Mountain National Parkviewing distance and rules
- National Park Service: Rocky Mountain National Parkrut closures, timed entry
- U.S. Fish and Wildlife Service: Spring break for sandhill cranes in Coloradocrane numbers and timing
- Monte Vista Crane Festivalfestival dates
- Colorado Parks and Wildlife: wildlife viewingviewing guidance
- Colorado Parks and Wildlife: State Forest State Parkmoose viewing
- Colorado Parks and Wildlife: Roaring Judy Hatcherykokanee viewing
- Colorado Parks and Wildlife: kokanee salmonspecies and run
- Colorado Parks and Wildlife: Barr Lake bald eagle brochureeagle viewing
- U.S. Fish and Wildlife Service: Rocky Mountain Arsenal Wildlife Drivedrive length, bison distance