We rented some crampons in Banff and headed out (without a tour group or guide) in the late morning to view what can only be described as magical! The pathway is very slippery as it is not maintained in the winter months, so I strongly suggest crampons to avoid what will be numerous slips and falls! The canyon is beautiful in the summer and spectacular in the winter. Make the extra effort to go the Upper Falls and enjoy! Bring a sandwich and a thermos and just take it in! You won't regret it!