As far as desert riding in my neck of the woods goes, East Fort Rock/Millican area just east of Bend is huge with well marked trails. Open areas, areas of scrub oak, areas of pine forest w/antelope. Last time I went there it was 15 degrees in the morning. By afternoon the sun had softened the deep snow on the higher trails, and it turned into a winch fest.
Most every place else I go is forested. The Tillamook riding area has super-steep stuff, mud, and ferns for undergrowth (coastal range). Moro County ATV park is flatter, drier forest...
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