Native to:
Alaska,
Alberta,
Aleutian Is.,
Arizona,
Arkansas,
British Columbia,
California,
Colorado,
Connecticut,
Delaware,
Greenland,
Idaho,
Illinois,
Indiana,
Iowa,
Kansas,
Kentucky,
Louisiana,
Maine,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
North Carolina,
North Dakota,
Northwest Territorie,
Nova Scotia,
Nunavut,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Prince Edward I.,
Québec,
Rhode I.,
Saskatchewan,
South Carolina,
South Dakota,
Tennessee,
Texas,
Utah,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Wyoming,
Yukon
Introduced into:
Altay,
Amur,
Austria,
Azores,
Baltic States,
Belarus,
Belgium,
Bulgaria,
Buryatiya,
Chatham Is.,
Czechoslovakia,
Denmark,
East European Russia,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Guatemala,
Hungary,
Iceland,
Inner Mongolia,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Leeward Is.,
Magadan,
Manchuria,
Mexico Southeast,
Morocco,
Netherlands,
New South Wales,
Newfoundland,
North Caucasus,
Northwest European R,
Norway,
Poland,
Portugal,
Primorye,
Romania,
Sakhalin,
South Australia,
South Georgia,
Spain,
Sweden,
Switzerland,
Tadzhikistan,
Tasmania,
Transcaucasus,
Turkey,
Tuva,
Ukraine,
Uzbekistan,
Victoria,
West Siberia,
Western Australia,
Yakutskiya,
Yugoslavia