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Santa Ana Mountains

Ecoregion in CA

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The Santa Ana Mountains ecoregion is steep to very steep with narrow to rounded summits and narrow canyons. Elevations range from about 700 to 5,687 feet at Santiago Peak. Ecoregion 85m is modified moderately by marine air, and generally is hotter and drier on the inland side. Annual precipitation of 14–24 inches is greater than in the adjacent lower-elevation ecoregions. Soil temperature regimes are thermic and mesic and the soil moisture regime is xeric. Vegetation includes mixed and chamise chaparral, coastal sage scrub, coast live oak, and areas of annual grassland. Some canyon live oak occurs, bigcone Douglas-fir is found at the heads of some canyons, and sparse stands of Coulter pine are at high elevations. In the southeast, the Santa Rosa Plateau supports areas of vernal pools, native grasslands, and some Engelmann oak woodlands.

— EPA

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