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Oxnard Plain and Valleys

Ecoregion in CA

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The Oxnard Plain and Valleys ecoregion occurs on nearly level floodplains and gently sloping alluvial fans and terraces in the valleys of the Santa Clara River and Calleguas Creek. Its landforms, alluvial geology, and land use contrast with the mountains of Ecoregion 8 to the north and the Venturan-Angeleno Coastal Hills ecoregion (85c) to the south and east. The hot, subhumid climate is modified greatly to moderately by marine air; early summer fog is common. The soil temperature regime is thermic and soil moisture regime is xeric. Vegetation historically included coastal sage scrub, coast live oak, and brome and needlegrass grasslands. Most of the natural vegetation has been replaced by cropland, citrus orchards, and urban and residential uses. The Santa Clara River drains much of the ecoregion and is perennial; Calleguas Creek is ephemeral.

— EPA

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