| Subarctic America | Aleutian Is., Alaska, Nunavut, Northwest Territories, Yukon |
| Western Canada | Alberta, British Columbia, Manitoba, Saskatchewan |
| Eastern Canada | Labrador, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward I., Québec |
| Northwestern U.S.A. | Colorado, Idaho, Montana, Washington, Wyoming |
| North-Central U.S.A. | Minnesota, Wisconsin |
| Northeastern U.S.A. | Maine, Massachusetts, Michigan, New Hampshire, New York, Vermont |
| Southwestern U.S.A. | Utah |
| South-Central U.S.A. | New Mexico |