Pieris marginalis
In 3 days ~30% in a week ~60%
Pieris marginalis (margined white) is a butterfly species seen across the coast of Western North America. It is a canopy generalist who feeds on the plant family of Brassiceae. The species is unique as it has been seen near and away from disturbed habitat; indicating an adaptation for habitat generalization. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States | |
| 2 | Olympic National Park | 🇺🇸 United States | |
| 3 | Glacier National Park | 🇺🇸 United States | |
| 4 | Rocky Mountain National Park | 🇺🇸 United States | |
| 5 | Grand Teton National Park | 🇺🇸 United States | |
| 6 | Zion National Park | 🇺🇸 United States | |
| 7 | Yellowstone National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vancouver | 🇨🇦 Canada | |
| 2 | Anchorage | 🇺🇸 United States | |
| 3 | Seattle | 🇺🇸 United States | |
| 4 | Portland | 🇺🇸 United States | |
| 5 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Margined White sighting in Rocky Mountain National Park on a given day, based on 43 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 29th most-seen of the 191 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.
July
In that month about 20% of wildlife watchers report a Margined White in Rocky Mountain National Park on a given day, against under 5% in October to May, the lowest months. That is one of Rocky Mountain National Park's wettest months, with about 95 mm of rain against 40 mm in September.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Margined White sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 7
Of the 7 parks where we can rate Margined White sightings, Rocky Mountain National Park ranks 4th at about 10%. The best odds are in Redwood National Park (United States, about 20%), Olympic National Park (United States, about 20%) and Glacier National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Margined White is recorded against all the insects logged in Rocky Mountain National Park (43 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.
