The areas had been closed to the public during the winter to provide undisturbed habitat for dusky Canadian geese and other wildlife.
All refuges are open from sunrise to sunset.
The majority of the William L. Finley refuge is open through Oct. 31. Near the trails, visitors may see a herd of Roosevelt elk along with black tailed deer, ducks and a variety of shorebirds and songbirds. Baskett Slough will remain open through Sept. 30. The refuge is on the north side of Highway 22 at milepost 14. A wildlife viewing kiosk offers interpretive panels, a viewing scope, resting benches, picnic tables and restrooms.