Originally Posted by treehouse
When we made reservations at Yellowstone NP, 40 ft was the max, and they were all sold out.
Same thing at Riley Creek campground in Denali NP... probably less than a quarter of the sites were for 30-40 foot.
For Yellowstone we have never made reservations. We have stayed at Mammoth, our favorite, which doesn't even take reservations, Madison and Bridge Bay. If you get there early morning (staying outside the park the previous night) we've gotten the sites.
Riley Creek in Denali Alaska - Again, we boondocked nearby the previous night and easily got a lovely large site without reservations.
For Teklanika campground in Denali - the farthest one you can drive an RV to, we did make reservations and you need to. However, you can't choose a site. Again, we got one for our 40' motorhome.
I'm not saying you don't need reservations but we do it all the time without. Besides, we like to see the sites in person.