Summer hours start at the museum on May 1. Saturday hours remain the same (8:45am-5pm, with the last tour of the day beginning at 3:45pm), but Sunday-Friday our hours are 9:45am-4pm, with the last tour of the day beginning at 2:45pm. On Saturdays we have two tours every hour—at the top and bottom of each hour. But Sunday-Friday we have one tour an hour at the top of the hour. Remember, regardless of what day you’re visiting or what tour you’re taking, we assemble every tour 10 minutes before its start time so that we can give you the required safety briefing. That’s why everyone should plan to arrive 30 minutes before your preferred tour time. Dodge the peak season crowds at the museum this summer. We’re the coolest place in southern Arizona even when it’s hot outside!