Assuming that you're from Vermont, I'm guessing that it's an Imperial Moth.
Description, from the USGS website:
Imperial moth (Eacles imperialis [Drury])
Wing span: 3 1/8 - 6 7/8 inches (8 - 17.4 cm).
Identification: Females are larger than males. Upperside is yellow with pinkish brown to purple-brown patches, bands, and cell spots, and tiny brown spots scattered overall. Males have larger patches on the forewings than females, except for some subspecies pini males which have reduced purple and are mostly yellow.