Arizona 19 Grand Canyon Country 10 Kofa 5 Sonoran Desert 4 California 328 Amargosa Basin 17 Anza Borrego and Chuckwalla Deserts 14 Central California Coast 1 Death Valley 87 Eastern Sierra and Mono Country 42 Joshua Tree 78 Mojave Preserve 33 Mojave Trails 9 Northern California Coastal Ranges 1 Sequoia and Southern Sierra 1 Southern California 12 Tahoe and Northern Sierra 10 Western Mojave 16 Yosemite and Central Sierra 7 Colorado 14 Northwest Colorado 2 San Juan Mountains 12 Idaho 19 Central Idaho 17 Idaho Panhandle 2 Montana 19 Central Montana Rockies 18 Glacier and Northern Montana Rockies 1 Nevada 115 Central Nevada 25 Eastern Nevada 32 Southern Nevada 18 Western Nevada 40 Utah 25 Central Utah 10 Northeast Utah 3 Southeast Utah 6 Southern Utah 2 Western Utah Desert 4 Washington 2 Northern Cascades 2