Tiny, fierce, and faster than your eye can track, Boulder’s hummingbirds are the sparkling jewels of our summer skies. From the buzzing trill of a broad-tailed hummingbird to the fiery flash of a rufous in late summer, these tiny aerial acrobats bring nonstop magic to Colorado backyards and trails.

If you’ve ever heard a high-pitched metallic zing zip past your ear, chances are you’ve met a broad-tailed hummingbird, Boulder’s most common summer resident. These little marvels weigh about as much as a penny, yet migrate nearly 1,500 miles each way from Mexico every year. Their wings beat around 50 times per second, and the males’ outer feathers create a buzzy trill in flight, like nature’s tiniest motorcycle.

Rufous Hummingbird

Who You’ll See in Boulder

Broad-Tailed Hummingbird

Your backyard regular. Males flash a brilliant rose-pink throat and shimmering emerald-green back. Their signature trilling sound often gives them away before you see them.

Black-Chinned Hummingbird

A less common visitor in Boulder. Males sport a black chin with a subtle purple shimmer in the right light.

Rufous Hummingbird

These fiery orange speedsters often pass through in late summer and can be surprisingly aggressive despite their tiny size.

Calliope Hummingbird

North America’s smallest bird, measuring just about three inches long. Blink and you might miss one.

When to Look for Them

Hummingbirds typically start showing up in Boulder by mid-April, sometimes earlier during warmer springs, and stick around through early fall.

A good rule of thumb: put your feeder up by April 1st and leave it out into October for stragglers passing through.

Best Places to Watch Them in Boulder

Chautauqua Park

They dart around the meadows, gardens, and wildflower-filled trails all summer long.

Eldorado Canyon State Park

The visitor center feeder can become a full-on hummingbird party. Go early in the morning for the best viewing.

Boulder Creek

Flowering trees and gardens along the creek often attract these little zippy visitors.

Fun Facts That’ll Blow Your Mind

• A hummingbird’s heart can beat up to 1,260 times per minute.
• They can fly backwards, upside down, and hover like helicopters.
• They eat about half their body weight in nectar and insects every day.
• Males are highly territorial and often dive-bomb rivals near feeders.
• Their tongues can flick in and out up to 13 times per second.

Pro Tips From a Boulder Bird Nerd

• Place feeders in the shade so the nectar doesn’t spoil quickly.
• Add small perches nearby—they love to rest and guard their territory.
• Keep cats indoors to protect these tiny birds.
• Hang multiple feeders if dominant males are chasing others away.

Once you start paying attention, you’ll see them everywhere—flashing past your window, battling over nectar, and sipping from your columbine flowers. They turn an ordinary Boulder summer into something magical.

So grab some sugar, plant a few flowers, and get ready to fall for Boulder’s tiniest residents. Your backyard may just become their favorite vacation spot.

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