Native to:
Alaska,
Alberta,
Altay,
Amur,
Austria,
British Columbia,
Buryatiya,
China North-Central,
China South-Central,
China Southeast,
Chita,
Connecticut,
Czechoslovakia,
East European Russia,
East Himalaya,
France,
Germany,
Idaho,
Illinois,
Indiana,
Inner Mongolia,
Irkutsk,
Italy,
Japan,
Kamchatka,
Khabarovsk,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Magadan,
Maine,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mongolia,
Montana,
Nepal,
New Brunswick,
New Hampshire,
New Jersey,
New York,
Newfoundland,
North European Russia,
Northwest Territories,
Nova Scotia,
Nunavut,
Ohio,
Ontario,
Oregon,
Pennsylvania,
Poland,
Primorye,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Saskatchewan,
Switzerland,
Tibet,
Tuva,
Ukraine,
Vermont,
Washington,
West Siberia,
West Virginia,
Wisconsin,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Baltic States,
Belarus,
Belgium,
Bulgaria,
Central European Russia,
Denmark,
Finland,
Føroyar,
Great Britain,
Hungary,
Iceland,
Ireland,
Netherlands,
Norway,
Sweden,
Turkey