 Wildflowers bloom from early May to late September but most are gone by late August . Moisture from snow @-@ melt along with some rainfall in late spring kick @-@ starts the germination of annual plants , including wildflowers . Most of these plants complete their entire life cycle in the few months each year that moisture levels are good . The onset of summer decreases the number of wildflowers and by autumn only the tiny yellow flowers of sagebrush and rabbitbrush remain . Some wildflowers that grow in the area are the arrow @-@ leaved <unk> , bitterroot , <unk> , desert parsley , dwarf monkeyflower , paintbrush , <unk> , scabland penstemon and the wild onion . 
