| Subarctic America | Alaska, Greenland, Nunavut, Northwest Territories, Yukon |
| Western Canada | Alberta, British Columbia, Manitoba, Saskatchewan |
| Eastern Canada | Labrador, New Brunswick, Newfoundland, Ontario, Québec |
| Northwestern U.S.A. | Montana, Wyoming |
| North-Central U.S.A. | Minnesota, Wisconsin |
| Northeastern U.S.A. | Maine, Michigan, New York, Vermont |