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The fort, called Winsor Castle, during the winter at Pipe Spring.
Winter (September through May): Monument grounds and Visitor Center/Museum are open 8:00 a.m. to 5:00 p.m. Tours of Winsor Castle are offered on the hour and half hour from 9:00 a.m. to 4:00 p.m.
Closed Thanksgiving, Christmas, and New Year's days.