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April-June: This is when there are no crowds, but you need to check conditions.You can ski, snowshoe, and snowboard! Please note that the Nisqually Entrance, in the southwest corner of the park, and the Carbon River Entrance are the only entrances open. But that doesn’t mean the park is closed. November-March: There is a ton of snow around this time of year.But be wary as there might be snow which can be dangerous. September-October: This a great time to avoid the crowds and see the bright fall colors.Please note that this is the most popular time to visit, which means more crowds. The wildflowers burst into action and paint the landscape with many extraordinary colors. July-August: Hiking Mt Rainier in July is the absolute best time to visit.Paradise is higher in elevation (5400ft), but it is the most popular section in the park. Above I show the average temperatures of the Paradise area in Mount Rainier National Park.
