Casa Grande Ruins NM preserves an ancient Hohokam farming community and Great House. The monument, just north of the town of Coolidge, is very small, only about 3/4 of a square mile (1.2 km). The monument is open every day of the year from 9AM-5PM (October 1st - April 30th), and 9AM-4PM (May 1st - September 30th) except Thanksgiving Day, Christmas Day and Independence Day....