Why Miller Moths Are Suddenly Everywhere in Colorado

2026 might be the year the Miller moths finally take over. It seriously feels like the dadgum things are everywhere! They even found their way into the radio station and fluttered around overnight until they set off our security alarm. Are these things driving anyone else crazy?

What are Miller moths, and why do they seem to love showing up in Western Colorado near Memorial Day? Let’s find out.

What Exactly Are Miller Moths?

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Miller moths (Euxoa auxiliaris) are the adult version of the army cutworm moth, which is native to Colorado. These moths take their nickname from their dusty, powdery-looking wings that resemble flour dust from old mills. They do not bite, they don’t sting, and they don’t do any particular damage to any homes on the Western Slope. Their main goal is to migrate from Colorado’s eastern plains into and over the mountains for cooler summer conditions and more food sources.

Why Western Colorado Gets Hit So Hard by the Migration

When Miller moths emerge from the eastern plains, they can fly over 100 miles into the mountains and on to the Western Slope. Colorado’s mountain valleys west of the divide are often resting places for Miller moths headed west. Butterflies.org says that weather patterns, moisture, and food availability can all affect how many moths people notice each year.

The Surprising Reason Colorado Actually Needs Miller Moths

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During years when their numbers are high, Miller moths are simply annoying. Despite occasionally getting into our homes, they help pollinate all kinds of plants and flowers in the Rocky Mountains, on the Grand Mesa, and on the Uncompahgre Plateau. While they don’t appear to be particularly appetizing to us, birds, bats, and even bears love to eat them by the truckload because they are packed with calories and nutrients. Have Miller moths shown up near where you live? Share where you are seeing them in the comments.