Based on 1,223 research-grade iNaturalist observations in Washington, Boisduval's Blue is most often recorded in May; in Washington it behaves like a summer visitor / breeder. It ranks #10 among butterflies recorded in the state in our data.
Icaricia icarioides
Boisduval's Blue in Washington by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Washington in May
Echo Azure
Pale Swallowtail
Painted Lady
Western Tiger Swallowtail
Small White
Common Ringlet
Anise Swallowtail
Lorquin's Admiral
Places to look in Washington
National ForestGifford Pinchot National Forest
National ForestOlympic National Forest
State ParkPeace Arch Park
National ForestColville National Forest
National ForestMount Baker–Snoqualmie National Forest
Botanical GardenBellevue Botanical Garden
FAQ
When does Boisduval's Blue appear in Washington?
Mainly May–August, with the most records in May.
How common is Boisduval's Blue in Washington?
It ranks #10 by number of iNaturalist observations among butterflies in Washington (1,223 records in our sample).