Hours: Grounds and trails daily 7:30-dusk. House tours are given Mon. at 10 and 1, early Mar. to mid-Dec. Visitor center open daily 10-5, early Mar. to mid-Nov.; by appointment rest of year. Exhibit barn Tues. and Fri.-Sun. noon-4, early Mar. to mid-Nov. Laboratory tours are offered Thurs. at 11 and 1 (also the first Fri. of the month at 1, year-round), early Apr. to mid-Nov. Phone ahead to confirm off-season hours. Closed Jan. 1, Thanksgiving and Christmas.