Due to public access confusion, access to the private property of Yacolt Mountain is not recommended. There is a quarry on the property and the large gate on the well-used haul road is a sign that being there on weekdays is not a good idea and on weekends this gate is locked.
There are a number of public access summits in SW Washington that can easily be activated - nearby Bells Mountain, Davis Peak, Green Mountain North and TumTum Mountain to name a few.