The Large Yellow Underwing is an introduced European noctuid now among the most abundant moths at lights across North America, particularly in the Pacific Northwest where it was first established. Its vivid yellow-and-black hindwings create a startling flash when flushed from resting. Larvae are polyphagous cutworms damaging to garden plants.
Best time to see a Large Yellow Underwing
The best time to see a Large Yellow Underwing is May–August, when about 63% of U.S. sightings happen, based on 22,789 research-grade iNaturalist observations.
Not certain it is a Large Yellow Underwing? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Large Yellow Underwing sightings near you
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