| Northern Europe | Finland, Sweden |
| Eastern Europe | Baltic States, Central European Russia, East European Russia, North European Russia, Northwest European Russia |
| Siberia | Buryatiya, Irkutsk, Krasnoyarsk, West Siberia |
| Russian Far East | Amur, Khabarovsk, Primorye, Sakhalin |
| China | China South-Central, Inner Mongolia, Manchuria, China North-Central, Tibet |
| Mongolia | Mongolia |
| Eastern Asia | Japan, Korea |
| 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, Oregon, Washington, Wyoming |
| North-Central U.S.A. | Minnesota, South Dakota, Wisconsin |
| Northeastern U.S.A. | Maine, Michigan, New Hampshire, New York, Vermont |
| Southwestern U.S.A. | Arizona, California, Utah |
| South-Central U.S.A. | New Mexico |