| Subarctic America | Alaska, Northwest Territories, Yukon |
| Western Canada | Alberta, British Columbia, Manitoba, Saskatchewan |
| Eastern Canada | Labrador, New Brunswick, Newfoundland, Ontario, Prince Edward I., Québec |
| Northwestern U.S.A. | Montana, Washington |
| North-Central U.S.A. | Illinois, Iowa, Minnesota, North Dakota, Wisconsin |
| Northeastern U.S.A. | Connecticut, Indiana, Maine, Massachusetts, Michigan, New Jersey, New York, Ohio, Pennsylvania, Vermont |
| Southwestern U.S.A. | California, Utah |