Wildfires happen in dry situations. In the north country summers forests can get very dry and fires can occur naturally, from lightning.
This map shows locations that experienced wildlfires greater than 250 acres, from 1980 to 2003. Map not to scale. Sources: Bureau of Land Management, U.S. Forest Service, U.S. Fish and Wildlife Service, Bureau of Indian Affairs, National Park Service, and the USGS National Atlas
