Mystery Castle is open from early October to end of May on Thursdays, Fridays, Saturdays and Sundays from 11 a.m. to 4 p.m. Get there before 3:30 p.m. if you want to take the last tour. Try to visit before it gets too hot! Call to check if it is open at 602-268-1581. Don't expect anyone to ever answer this phone or return your call if you leave a message. At least that has been my experience.