You can find yurts at the state park campground between Medford and Grants Pass at Valley of the Rogue State Park, but they may be booked… they tend to book fast. For a really unique ‘glamping’ option right in Medford, I recommend Morriplum Farm Sanctuary. It’s between Medford and Jacksonville, and the couple who run it have their own small sanctuary of animals. On a hillside just above their small farmhouse, they’ve built pretty glamping cabins with beds and an outdoor shower and bathroom (open-air but private).
You can also find similar spaces (though I believe they’re canvas tents) outside Ashland at Willow Witt Ranch, though they may be seasonal.