I hiked this October 28th, 2013 and there was a significantly amount of snow. Started at 3pm and got up at 4:30 - took a few small breaks but was moving the rest of the time. I'd say in the snow it was strenuous for a decently fit person. Did it after Johnston Canyon in the early AM and Lake Louise for lunch, to give you an idea for timing.
The view at the top was unparalleled. So happy that I went, it was an unforgettable experience. It is pretty far from banff village (2.5 hours?) and the road is rough in the winter - I was going to Jasper, so no issue there. It was very quick to get down but I slipped and fell in the snow a few times. From the tracks some people brought snowboards and snowboarded down, which looked fun (but I assume you're not supposed to). There was no one there for the entire time I was (2 hours in total), so it was a wicked experience to be by yourself. I've never had quiet like I did at the top there, no wind, no sound, nothing.
In the snow you can't see the trail once you get about 70% up so you have to hope someone else has already made it. Near the top I just ended up going straight up instead of doing the side to sides - was more tiring but I couldn't see the trail anyway.
I'd do this again in a second and I'd bring anyone I was with here. If you are not fit and if you are not well prepared I would strongly recommend doing this in the winter months (no idea about the summer)
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