Colorado Desert Location: North America's Southwestern Arid Zone

The Colorado Desert is a subdivision of the larger Sonoran Desert, located in North America within the southwestern United States.

Geographic Extent

• Primary area: Southeastern California (Imperial, Coachella, Borrego Valleys)
• Secondary extension: Southwestern Arizona (Yuma vicinity)
• Boundaries: San Jacinto/Santa Rosa Mountains (west), Colorado River (east), Mexican border (south), transition to Mojave Desert (north)
• Area: ~7 million acres (~28,000 km²)
• Elevation: -235 ft (Salton Sea) to ~3,000 ft (mountain margins)

Key Features

• Salton Sea — California's largest lake (accidental, 1905 Colorado River breach)
• Anza-Borrego Desert State Park — 600,000 acres, wildflower blooms, bighorn sheep
• Joshua Tree National Park (southern section) — Transition zone to Mojave
• Coachella Valley — Agricultural oasis (dates, citrus, table grapes) via Colorado River irrigation
• Imperial Valley — Year-round farming (winter vegetables) fed by All-American Canal

Climate

Lower, hotter, drier than the Mojave. Summer highs 105–115°F (40–46°C); winter days 70–80°F (21–27°C). Rainfall <3 inches/year (bimodal: winter Pacific storms, summer monsoon bursts).

Not to Be Confused With

• Colorado Plateau — High desert in UT/CO/AZ/NM (Grand Canyon, Monument Valley)
• Great Basin Desert — Cold desert in NV/UT/ID/OR
• Chihuahuan Desert — TX/NM/Mexico (largest North American desert)

The Colorado Desert is a distinct ecological and geographic unit within the Sonoran Desert, shaped by the Colorado River's historic and engineered flows.