Park admission $6 (nonresidents per private vehicle); $4 (nonresidents arriving by other means); free (Montana residents with ID). Camping $12-$34 (nonresidents); $6-$24 (nonresidents with a Montana State Park passport and Montana residents with ID).
Park open daily 24 hours (weather permitting). Visitor center open daily 10-5, third Fri. in May-third Sun. in Sept; Wed.-Sun. 10-5, rest of year. Allow 2 hours minimum.