Hours: Trails open dawn-dusk, mid-Apr. to mid-Feb. (weather permitting). Visitor center daily 8-5:30, mid-Feb. to mid-Apr.; Mon.-Fri. 9-5, Sun. 1-4, rest of year. Closed Jan. 1, Thanksgiving and Christmas Eve-Dec. 31. Guided crane viewing tours are offered daily at 5 a.m. and 5 p.m., Mar. 5-12; 6 a.m. and 6 p.m., Mar. 13-Apr. 10. Closed major holidays.