Glaucopsyche piasus
In 3 days ~20% in a week ~40%
Glaucopsyche piasus, the arrowhead blue, is a western North American butterfly of the family Lycaenidae. It is a locally common butterfly that favors prairie, open woodland, and woodland edges and trails. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Yellowstone National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Arrowhead Blue sighting in Sequoia and Kings Canyon National Parks on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 137th most-seen of the 161 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report an Arrowhead Blue in Sequoia and Kings Canyon National Parks on a given day, against under 5% in August to May, the lowest months. Those are among Sequoia and Kings Canyon National Parks's driest months, with about 20 mm of rain a month against 190 mm in January.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Arrowhead Blue sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Arrowhead Blue sightings, Sequoia and Kings Canyon National Parks has the highest daily chance: about 10%. Next come Yellowstone National Park (United States, under 5%).
Same family: Lycaenidae
The closest relatives of the Arrowhead Blue that you can see in Sequoia and Kings Canyon National Parks (family Lycaenidae, Gossamer-winged Butterflies) are Spring Azure (about 30%), Boisduval's Blue (about 10%) and Sierra Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Arrowhead Blue is recorded against all the insects logged in Sequoia and Kings Canyon National Parks (5 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.
