Native to Eurasia, introduced to North America at Boston, Massachusetts circa 1869 and has been spreading ever since (US Forest Service
). Michigan, Pennsylvania, and all states to the north and east of these. Also much of Wisconsin. Also the northern parts of Illinois, Indiana, and Ohio. Most of West Virginia is included in the insect's range, as well as parts of Virginia and North Carolina. The United States Forest Service estimates the moth's range is spreading south and west at a rate of about 21 kilometers per year. In Canada, the Gypsy Moth is present in British Columbia and in much of eastern Canada.