The Castle Air Museum is open seven days a week, from 10 a.m. to 4 p.m. from November to April; and from 9 a.m. to 5 p.m. from May to October. There is an entrance fee. Guided tours are available with advance notice. The museum is closed on New Year's Day, Easter, Thanksgiving and Christmas. For more information, call (209) 723-2182.