Call toll-free 1-877-444-6777 between 10 a.m. to midnight Eastern Standard Time between March 1 and Oct. 31 and 10 a.m. and 10 p.m. EST between Nov. 1 and end of February for information and to make a reservation. Call centers are closed on Thanksgiving, Christmas, and New Years Day. Group sales for ticketing is closed on Sundays. You can also get information and make reservations online here at
Recreation.gov.