Anthocharis julia
In 3 days ~20% in a week ~30%
Anthocharis julia, also known as the Southern Rocky Mountain Orangetip, is a type of butterfly found in the southern Rocky Mountains on the eastern side of the range. Their caterpillars feed on rock cress (Arabis) species. Adults feed on flower nectar from host plants as well as thistles, fiddleneck, and brodiaeas. Its habitats include forested riparian areas, canyons among foothills, and washes, usually in oak woodland. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grand Teton National Park | 🇺🇸 United States | |
| 2 | Olympic National Park | 🇺🇸 United States | |
| 3 | Glacier National Park | 🇺🇸 United States | |
| 4 | Yellowstone National Park | 🇺🇸 United States | |
| 5 | Rocky Mountain National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Julia Orangetip sighting in Rocky Mountain National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 104th most-seen of the 191 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
May
In that month about 20% of wildlife watchers report a Julia Orangetip in Rocky Mountain National Park on a given day, against under 5% in July to April, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Julia Orangetip sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
5th of 5
Of the 5 parks where we can rate Julia Orangetip sightings, Rocky Mountain National Park ranks 5th at about 10%. The best odds are in Grand Teton National Park (United States, about 20%), Olympic National Park (United States, about 10%) and Glacier National Park (United States, about 10%).
Same family: Pieridae
The closest relatives of the Julia Orangetip that you can see in Rocky Mountain National Park (family Pieridae, Whites, Yellows, and Sulphurs) are Mead's Sulphur (about 10%), Margined White (about 10%) and Queen Alexandra’s Sulphur (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Julia Orangetip is recorded against all the insects logged in Rocky Mountain National Park (12 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.
