Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east to Idaho, Montana, and Utah.
Habitat: Grasslands, riparian zones, thickets, openings, and seeps.
Flowers: May-July
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Crataegus castlegarensis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Crataegus castlegarensis checklist entry
OregonFlora: Crataegus castlegarensis information
E-Flora BC: Crataegus castlegarensis atlas page
CalPhotos: Crataegus castlegarensis photos