This depends on what you’re interested in. If big, exciting water is what your group is looking for, then high-water season is the best time. Mid-May to mid-June is traditionally high-water season. When rivers run at their peak, it can make for a big ride. Keep in mind some sections may close due to high water conditions. Most people enjoy normal run off-season, which is mid-June to late-August. The water stays consistent and the days tend to be sunny and warm with the occasional afternoon rain shower. Water levels and weather are very unpredictable, so book a date that best suits the group and be prepared for the unexpected. There really is no bad time to go white water rafting in Colorado.