Spring Birdwatching in Colorado: Migration Season

Spring migration transforms Colorado into a birdwatcher's paradise. The state sits at the intersection of major flyways, bringing species from Central America, Mexico, and the Gulf Coast through on their way north. Over 500 species have been recorded in Colorado, with incredible variety within short distances.

The timing varies by species. Waterfowl and sandhill cranes peak in March. Songbirds and warblers arrive in April and May. Raptors pass through steadily all spring, riding thermal currents over the Front Range. The diversity of habitats - from prairie to alpine tundra - means you might spot sandhill cranes on the plains, mountain bluebirds in the foothills, and ptarmigan above treeline in a single day.

Sandhill Cranes at Monte Vista

Monte Vista National Wildlife Refuge in the San Luis Valley hosts one of spring's great wildlife spectacles. Each March, over 20,000 sandhill cranes gather in the refuge, resting and feeding before continuing north. The sight and sound of thousands of four-foot-tall birds filling the sky at sunrise is unforgettable.

The Monte Vista Crane Festival each March celebrates the migration with guided tours, workshops, and programs. Even without the festival, the refuge offers excellent viewing from auto tour routes and observation decks.

Front Range Spots

Barr Lake State Park north of Denver is one of Colorado's premier birding destinations. Over 350 species have been recorded. A bald eagle nest draws viewers year-round, and the nature center offers programs. Spring migration brings warblers, waterfowl, and shorebirds to the wetlands and surrounding habitats.

Rocky Mountain Arsenal offers accessible birding near downtown Denver. The former chemical weapons facility has been restored to prairie and wetland habitat, now hosting bison, deer, and over 330 bird species. The wildlife drive passes multiple habitats. Free admission.

Chatfield State Park combines reservoir birding with cottonwood riparian habitat. The heronry along the South Platte hosts great blue herons and double-crested cormorants. Multiple habitats in one park attract diverse species.

Spring Birding Tips

Go early. Dawn is prime time for birding. Birds are most active and vocal in the first hours of daylight. Wind picks up later, making spotting difficult. By mid-morning, activity drops significantly.

Bring good binoculars. 8x42 is a versatile size - enough magnification to see detail, wide enough field of view to find birds. A spotting scope helps for distant waterfowl and shorebirds.

Learn the sounds. Many birds are heard before seen. Learning common calls dramatically increases what you find. Apps like Merlin Bird ID can help identify songs in the field.