The caves in Mammoth Cave National Park are consistently 54* – but the park still sees a strong ebb and flow of visitors depending on the time of year.
Mammoth cave High season is late spring to early fall. The cave tours are busiest in June, July and August. At this time of year it is highly recommended to book cave tours online in advance, preferably 3-4 weeks in advance. On weekdays (Monday and Tuesday) visits are less crowded than Friday to Sunday.
Low seasons: Spring (March-May) and autumn (September-November) are also busy. Weekends are obviously the most crowded and tours need to be booked at least 1-2 weeks in advance. If you visit on a long weekend, expect crowds and sold-out tours.
Low Season: December through February are the slowest months in Mammoth Cave National Park, with January and February being the slowest. During this time, it will be easier to find available tours and cheaper hotel rooms. I believe that the off-season is the best time to visit if you want to take the Mammoth Cave tours exclusively with children. If you want to experience the caves but also hike, you should try Mammoth Cave in the summer.
Whatever the season, the busiest cave tours take place between 10 a.m. and 2 p.m. Therefore, try to book a morning tour to avoid crowds, especially if you are visiting Mammoth Cave with children.
