Based on 1,427 research-grade iNaturalist observations in Idaho, California Tortoiseshell is most often recorded in July; in Idaho it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Nymphalis californica
California Tortoiseshell in Idaho 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 Idaho in July
Lorquin's Admiral
Western Tiger Swallowtail
Common Wood-Nymph
Small White
Weidemeyer's Admiral
Painted Lady
Northern Checkerspot
Pale Swallowtail
Places to look in Idaho
National ForestBoise National Forest
National ForestCaribou–Targhee National Forest
National ForestSawtooth National Forest
State ParkCity of Rocks National Reserve
State ParkMassacre Rocks State Park
National ForestKaniksu National Forest
FAQ
When does California Tortoiseshell appear in Idaho?
Mainly March–July, with the most records in July.
How common is California Tortoiseshell in Idaho?
It ranks #1 by number of iNaturalist observations among butterflies in Idaho (1,427 records in our sample).