The White Underwing is a striking underwing moth where white replaces the red of most relatives, bearing black banding on brilliant white hindwings. Its gray-and-white forewing pattern mimics the gray bark of the birch and aspen trees it inhabits. It is one of the largest and most beautiful members of the Catocala genus.
Best time to see a White Underwing
The best time to see a White Underwing is August–September, when about 83% of U.S. sightings happen, based on 1,900 research-grade iNaturalist observations.
Not certain it is a White Underwing? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent White Underwing sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted a White Underwing?
Point Huck at any plant, bird, or animal and know for sure - plus a live map of where it is being spotted near you.