How big is Anza-Borrego Desert State Park?

More than 600,000 acres, or roughly 1,000 square miles. It is the largest state park in California and the third largest in the United States, spanning parts of San Diego, Riverside and Imperial counties.

How much does it cost to enter Anza-Borrego?

Day use is $10 per vehicle, collected at the Visitor Center, developed campgrounds and several popular trailheads including The Slot and Hellhole Canyon. The park has no entrance gates and much of it can be accessed without a fee.

When is wildflower season at Anza-Borrego?

Annual wildflowers can appear from January through mid-April, with peak bloom most often between late February and early April. Timing varies year to year based on rainfall and temperature.

Is Anza-Borrego a Dark Sky Park?

Yes. The park was designated an International Dark Sky Park in 2018 at Silver tier. Borrego Springs, the town at its center, has been an International Dark Sky Community since 2009, the first in California.

Do I need four-wheel drive at Anza-Borrego?

Not for the paved roads, the Visitor Center or the main campgrounds. The vast majority of the park's roughly 500 miles of dirt roads do require a high-clearance four-wheel-drive vehicle.

Is Anza-Borrego Desert State Park open at night?

Yes, the park is open 24 hours a day, year-round. The Visitor Center is open daily 9am to 5pm October through May, and weekends and holidays only June through September.

Shandel Sutherland • December 6, 2021

Borrego Valley Hawkwatch: A Unique Migration Event in Borrego Springs

Witness One of the Largest Swainson’s Hawk Migrations in North America

Each spring, Borrego Springs becomes a prime location to observe migrating Swainson’s Hawks as they travel from wintering grounds in Mexico, Colombia, and Argentina to breeding sites in North America. The Borrego Valley Hawkwatch, one of only two official hawkwatches in California, documents this annual migration, attracting birdwatchers, researchers, and nature enthusiasts.

When and Where to Observe the Migration

Peak Migration: Mid-February through April, with the highest activity typically in mid to late March.
Best Viewing Locations: Key observation points include Borrego Valley, Coyote Canyon, and Henderson Canyon Road.
Time of Day: Hawks are most active in the early morning and late afternoon when they take flight from their overnight roosts.

Why Swainson’s Hawks Stop in Borrego Springs

Borrego Springs provides a critical food source for migrating hawks. After winter rains, White-lined Sphinx Moth caterpillars emerge, feeding on blooming wildflowers. The hawks stop to refuel on these caterpillars before continuing their long journey north.

What Birds Can Be Seen?

While Swainson’s Hawks are the primary species observed, other raptors spotted during migration include:

Red-tailed Hawk
American Kestrel
Osprey
White-tailed Kite

On peak migration days, it is possible to see hundreds of hawks soaring together in swirling formations known as “kettles.”

How to Get Involved

The Borrego Valley Hawkwatch is a volunteer-driven effort that tracks hawk migration trends. Volunteers are trained to count and document hawks, contributing valuable data for conservation. Both experienced and beginner birdwatchers are encouraged to participate.

Tips for Watching the Migration

Bring binoculars or a spotting scope for a closer look.
Check weather conditions—clear skies and warm thermals increase hawk activity.
Visit multiple times—migration numbers fluctuate, with some days producing thousands of hawks.
Look for local updates on peak viewing days and guided observation opportunities.

An Incredible Natural Spectacle

The Borrego Valley Hawkwatch offers a rare opportunity to witness one of North America’s most remarkable bird migrations. With thousands of hawks passing through each season, it is a must-see event for birdwatchers and nature lovers alike.

For more details on participating or viewing opportunities, visit the Borrego Valley Hawkwatch website or follow updates from local birding groups.