The Arrowhead Blue is a beautiful western small blue butterfly with males showing bright iridescent blue and females with extensive blue iridescence as well — unusual for female blues. Its underside bears distinctive arrow-shaped spots that give it its common name. It is closely associated with lupine host plants in open western forests.
Best time to see a Arrowhead Blue
The best time to see a Arrowhead Blue is May–June, when about 71% of U.S. sightings happen, based on 742 research-grade iNaturalist observations.
Not certain it is a Arrowhead Blue? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Arrowhead Blue sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted an Arrowhead Blue?
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