List of ecoregions in Oregon

The Commission's 1997 report, Ecological Regions of North America, provides a spatial framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems.

[1] Ecoregions may be identified by similarities in geology, physiography, vegetation, climate, soils, land use, wildlife distributions, and hydrology.

There are 65 Level IV ecoregions in Oregon,[3] many of which continue into adjacent areas in the neighboring states of Washington, Idaho, Nevada, and California.

The west side of the state has a marine-influenced climate and receives plentiful precipitation three seasons of the year.

The climatic gradient is evident in the state's landscapes: forested mountains, glaciated peaks, shrub- and grass-covered plains, agricultural valleys, beaches, desert playas, and wetlands.