Oregon State Parks offers more than 50 campgrounds across the state. Twenty-eight accept reservations year-round. The others are first-come, first-served. While first-come, first-served parks don't accept reservations for campsites, they do take them for cabins, yurts, tepees and other special facilities. Check-in time is 4 p.m. each day.
Here's a list of the first-come, first-served campgrounds:
Emigrant Springs (mix of first-come, first-served and reservable sites)
Farewell Bend (A Loop first-come, first-served. B and C Loops reservable)
Jasper Point Campground at Prineville Reservoir
Lake Owyhee (mix of first-come, first-served and reservable sites)
Smith Rock (special walk-in bivouac camping)