The park and preserve are open year-round. At Brooks Camp, National Park Service and concessioner services are offered from June 1 through September 17. Prime bear viewing months at Brooks Camp are July and September, although a few bears may be in the area at any time between late May and December.

Bear viewing in coastal areas is possible during June through August. Click here for a table for best bear viewing time periods.  Backcountry activities are best during June through September.