Overall, May, June and September are the best months to visit Banff. These months have warm weather but there are fewer crowds. Hotel prices can also be lower in May and June.
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Between mid-June to October, parking at Lake Louise is a struggle. You'll want to arrive before 8:00 a.m. to secure a parking spot at Lake Louise, which means an early rise unless you stay at the Fairmont Chateau Lake Louise. We've never had a problem parking at Lake Louise during the shoulder season or winter.
It can also be seen in September, but usually, by this time, the silt is settling to where there is no more reflection of the light and the lake begins to lose its color. The next change the lake takes is in mid-November when it starts to freeze up again and it repeats the cycle.
Can you see the Northern Lights in Banff in September? You can spot the Northern Lights in Banff in September, but again, you better your chances at the dark sky preserve.