These rather large moths can be found all across southern Canada and the United States. They tend to be more common in the east since their larvae bore into the wood of deciduous trees (locust, oak, chestnut, poplar, willow, maple, and ash). Unlike many moth species that get it all done in one season, Carpenterworm Moths take their sweet time, needing 3 to 4 years to go from egg to adult. BugGuide has some great photos of their lifecycle stages here (scroll down to the “Life Cycle” section).  

Size: Wingspan of 1.7 to 3.4 inches (female larger than the male) 

Photo by: Tony Virgona on 7/15/22 in Missoula, MT