Boloria epithore
In 3 days ~30% in a week ~60%
Boloria epithore, the Pacific fritillary, is a butterfly of the family Nymphalidae. It is found in western North America from California to British Columbia and Alberta. The wingspan is 34–44 millimetres (1.3–1.7 in). The butterfly flies from June to July.
The larvae feed on Viola ocellata. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Glacier National Park | 🇺🇸 United States | |
| 3 | Olympic National Park | 🇺🇸 United States | |
| 4 | Yosemite National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Pacific Fritillary sighting in Yosemite National Park on a given day, based on 40 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 42nd most-seen of the 227 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
June and July
In those months about 20% of wildlife watchers report a Pacific Fritillary in Yosemite National Park on a given day, against under 5% in August to May, the lowest months. Those are among Yosemite National Park's driest months, with about 25 mm of rain a month against 220 mm in January.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Pacific Fritillary sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Pacific Fritillary sightings, Yosemite National Park ranks 4th at about 10%. The best odds are in Sequoia and Kings Canyon National Parks (United States, about 20%), Glacier National Park (United States, about 10%) and Olympic National Park (United States, about 10%).
Same family: Nymphalidae
The closest relatives of the Pacific Fritillary that you can see in Yosemite National Park (family Nymphalidae, Brush-footed Butterflies) are Limenitis bredowii (about 40%), California Tortoiseshell (about 30%) and Mormon Fritillary (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pacific Fritillary is recorded against all the insects logged in Yosemite National Park (40 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
