Hesperumia sulphuraria
In 3 days ~20% in a week ~40%
Hesperumia sulphuraria, commonly known as the sulphur moth or sulphur wave, is a species of geometrid moth in the family Geometridae. It is found in North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Glacier National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Edmonton | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report a Sulphur Moth sighting in Glacier National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 86th most-seen of the 147 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.
July and August
In those months about 10% of wildlife watchers report a Sulphur Moth in Glacier National Park on a given day, against under 5% in September to June, the lowest months. Those are among Glacier National Park's driest months, with about 30 mm of rain a month against 80 mm in February.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Sulphur Moth sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 2 parks where we can rate Sulphur Moth sightings, Glacier National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Acadia National Park (United States, about 10%).
Same family: Geometridae
The closest relatives of the Sulphur Moth that you can see in Glacier National Park (family Geometridae, Geometer Moths) are Brown Pine Looper Moth (about 10%), White-Striped Black (about 10%) and Sharp-Lined Yellow (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sulphur Moth is recorded against all the insects logged in Glacier National Park (11 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.
