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Typically, the roots remain alive after one of these things. You should see the streamside vegetation (willows, cottonwoods, etc.) resprout almost immediately. The dry land parts take longer, colonized by grasses and forbs first. Brush like sage and bitterbrush resprout more slowly and may take a generation to fully redevelop. Sometimes succession can be helped along by replanting seedlings of critical species. There's a volunteer based sagebrush/bitterbrush replanting going on in Idaho right now. One of their burns last year covered 1000 sq miles and involved some important antelope/deer range.
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