List of ecoregions in California

California is in the Nearctic realm. Ecoregions are listed by biome:^[1]

• Eastern Cascades forests (Eastern Cascades Slopes and Foothills)
• Great Basin montane forests
• Klamath–Siskiyou forests (Klamath Mountains)
• Northern California coastal forests
• Sierra Nevada forests

• California Central Valley grasslands

• California coastal sage and chaparral
• California interior chaparral and woodlands
• California montane chaparral and woodlands

• Great Basin shrub steppe
• Mojave Desert
• Snake–Columbia shrub steppe
• Sonoran Desert