We recommend booking a tour as soon as you are interested in that specific tour. We have many tours that sell out early year after year. It is never too early to reserve a tour but it can be too late. Tour booking cut offs can vary from 30 days to 60 days, so waiting until the last minute is not a possibility. To guarantee a tour, we must reach minimum numbers of passengers before the date that Pro Tours is required to cancel accommodations and/or attractions without penalty. This can vary anywhere from 30 days to 90 days prior to departure. If we don’t receive the minimum number of passengers required by that date the trip will be canceled. Waiting to book your spot until the trip is guaranteed can contribute to a tour being canceled.