Location planning - if zombies struggle in severe winter, would the Canadian North not be the best place to be?
So as a Canadian I can point out a few locations that would be great if zombies freeze to death.
Anywhere along Hudson Bay. The Southernmost town on Hudson / James Bay is Moosonnee, and the snowy period is typically 7ish months (October - May). And no road access, meaning limited infection.
Near Fort McMurray / Oil fields of N.E. Alberta. Plenty of oil to burn for heat, as well as snowy period of roughly 6 1/2 months (October - Mid April). Coldest winter days typically have -40 wind chill.
Arctic Archipelago. Actually one of the largest (and of course, sparsest) archipelagos in the world. Along the coast, there's no real summer. In Iqaluit, Nunavut's biggest town (which is on the coast), the hottest recorded temperature is 26.7C (~80F), and the snowy period is cited as 9 months on a quick google search. It also said that snow is possible in July or August.
Outside Whistler, BC. So, can zombies walk in snow? Whistler-Blackcomb ski resort gets an average of 7.87m, or ~25' of snow. That's a lot. If you go about 1km up higher, you could probably get glaciers.
The bottom line though, you probably would be just fine anywhere in the wilderness, so long as you can survive your own. Back when residential schools were a thing, the Europeans even had trouble finding Indigenous children to kidnap because there's so much land. Now imagine zombies trying to find you. Especially in British Columbia's areas of coal reserves, which I didn't even mention, you'd be totally fine.