Based on 1,033 research-grade iNaturalist observations in Utah, California Tortoiseshell is most often recorded in July; in Utah it behaves like a summer visitor / breeder. It ranks #5 among butterflies recorded in the state in our data.
Nymphalis californica
California Tortoiseshell in Utah 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 Utah in July
Weidemeyer's Admiral
Monarch
Small White
Two-tailed Swallowtail
Western Tiger Swallowtail
Blue Copper
Painted Lady
Gray Hairstreak
Places to look in Utah
State ParkDead Horse Point State Park
State ParkGoosenecks State Park
State ParkGoblin Valley State Park
National ForestDixie National Forest
State ParkCoral Pink Sand Dunes State Park
State ParkKodachrome Basin State Park
FAQ
When does California Tortoiseshell appear in Utah?
Mainly March–July, with the most records in July.
How common is California Tortoiseshell in Utah?
It ranks #5 by number of iNaturalist observations among butterflies in Utah (1,033 records in our sample).