$6 (nonresidents per private vehicle); $4 (nonresidents arriving by other means); free (Montana residents with ID).
Park open daily 8-8, mid-May to late Sept.; Wed.-Sun. 8-5, rest of year. Visitor center open daily 10-5, mid-May to late Sept.; Wed.-Sun. 10-5, rest of year. Phone ahead to confirm schedule. Allow 1 hour minimum.