Almost four years ago now, but it was early April and the park campground was under 10 ft of snow.
We stayed at Joseph Stewart State Park on Lost Creek Lake of the Rogue River. Excellent state park.
Very easy drive to Crater Lake, which was open to the rim. Beautiful view on a bright sunny day. Though snow as almost 20 feet deep at the rim. Roads plowed perfectly.
This po' lil' country boy from the piney woods of southwest Arkansas never saw that much snow before. And the lake was amazing also.