The entire Monument is open from sunrise to sunset. The one exception is for hunting, when the hours are 1½ hours before legal hunting hours to 1½ hours after sunset.
Please be aware that the White Bluffs Boat Launch is closed to launching of motorized boats from November 1 through June 30. This stretch of the river is a sanctuary for over-wintering waterfowl. That said, loading and unloading non-motorized craft (e.g., canoes, kayaks, rafts) is allowed, although you may have to carry your boat to and from the parking lot.
Columbia River Corridor Unit — The river's surface waters are open year-round. The shorelines (1/4 mile from the mean high water mark) are closed, except at designated locations, as are all islands between Vernita Bridge and the Bonneville Power line (river mile 351). Federally owned islands below this line are open below the ordinary high water mark.
Rattlesnake Unit and Fitzner-Eberhardt Arid Lands Ecology Reserve — The Rattlesnake Unit, including the ALE, is closed to general public access. Use is currently limited to approved ecological research and environmental education activities.
Ringold Unit — This area is open to the public year-round.
Saddle Mountain Unit — The Saddle Mountain Unit is open to public use year-round.
Wahluke Unit — The western half of the Wahluke Unit (Saddle Mountain National Wildlife Refuge) is currently closed to general public access. Use is limited to approved ecological research and environmental education activities. The eastern half is open to public use year-round.
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Once a national wildlife refuge itself, Saddle Mountain National Wildlife Refuge still exists, but as part of the much larger Hanford Reach National Monument.