Great Basin Desert: North America's Cold Desert

The **Great Basin Desert** occupies the **hydrographic Great Basin**—primarily **Nevada, western Utah, and slivers of Oregon, Idaho, California, Wyoming**—entirely in **North America**.

Desert Classification

• Type: **Cold desert** (mid-latitude, rain-shadow).
• Elevation: 1,200–2,500 m (4,000–8,000 ft) basin floors.
• Precipitation: 150–300 mm/yr (6–12 in), mostly winter snow.
• Temperature: -20°C to 35°C (-4°F to 95°F) annual range.

Why "Great Basin"?

**Hydrologic definition:** No rivers reach the ocean. Water ends in **playas (Bonneville, Lahontan, Carson sinks), saline lakes (Great Salt Lake, Pyramid, Walker), or evaporates**.

Bordering Deserts

• North: Columbia Plateau / Sagebrush steppe.
• South: **Mojave Desert** (transition at ~37°N, creosote bush line).
• East: Colorado Plateau (higher, red rock).
• West: Sierra Nevada rain shadow (sharp ecotone).

Key Features

• Basin & Range topography: 160+ north-south mountain ranges, 90+ basins.
• Ancient lakebeds: Lake Bonneville, Lake Lahontan (Pleistocene pluvial lakes).
• Bristlecone pines: Oldest living trees (5,000+ yr) on high peaks.
• Dark skies: **Great Basin NP, Massacre Rim, Gerlach** – Gold-tier IDA sites.

It’s **North America’s largest desert** (by some definitions) and its **only cold desert**—a continent’s basement, not a sandbox.