That depends upon how far north you are.
In the Yukon Territory, snow can come as early as September.
https://weatherspark.com/history/28226/2013/Dawson-City-Yukon-Territory-Canada
However, it's different in Europe. The Gulf Stream keeps the western coasts of Europe, especially the British Isles much more temperate. In Scotland, roses sometimes keep on blooming into December.
What time of year does snow come to the far north?
4 answers
Really far north it would be september?
It can be, yes, Danny. Even in the Great Lakes it sometimes snows as early as October, but not in most years. It does vary, depending not only on the Gulf Stream in the Atlantic Ocean but the jet streams in the upper atmosphere. Last winter (2013-14) was unusually cold and snowy east of the Rockies in the U.S. because a high pressure bubble over the Pacific off California, Oregon and Washington forced the jet stream up into the arctic before it dipped back to the lower 48 states east of the Sierra and the Rocky Mountains. So, there is no hard and fast rule.
63 degrees North, give or take several degrees.
http://www.travelmath.com/province/Yukon+Territory
http://weatherspark.com/history/28226/2013/Dawson-City-Yukon-Territory-Canada
http://www.travelmath.com/province/Yukon+Territory
http://weatherspark.com/history/28226/2013/Dawson-City-Yukon-Territory-Canada