Western Canada Road Trip! - Plan to join me

H22A4 said

Regardless it should be a good trip. And by May you shouldn‘t need to worry about snow in the mountain passes.

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I've seen some heavy snow in late May in the mountains before, got stuck on a pass east of Osoyoos because of a snowstorm one year. Woke up to a foot of fresh snow in Pincher Creek Alberta that same year, around May long weekend.