| Subarctic America | Alaska |
| Western Canada | Alberta, British Columbia, Manitoba, Saskatchewan |
| Eastern Canada | New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward I., Québec |
| Northwestern U.S.A. | Colorado, Idaho, Montana, Oregon, Washington, Wyoming |
| North-Central U.S.A. | Illinois, Iowa, Minnesota, Nebraska, South Dakota, Wisconsin |
| Northeastern U.S.A. | Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia |
| Southwestern U.S.A. | Arizona, California, Nevada, Utah |
| South-Central U.S.A. | New Mexico |
| Southeastern U.S.A. | Delaware, Georgia, Kentucky, Maryland, North Carolina, South Carolina, Tennessee, Virginia, District of Columbia |