Originally Posted by
Machka
If there are no tent symbols, then tents are not likely welcome ... often not even in an RV site.
And you can try booking a few days in advance as you go along. I did this when I toured Australia. About Tuesday-ish, I'd book a place for Friday or Saturday night because I knew weekends were busier.
The really long advanced booking times are for National Parks during peak season. National Parks will only make up a portion of your trip, chances are a relatively small portion.
I've never encountered a state or national campground that didn't accept tents. Typically the tent symbol meant a site is tent only.
As to the OP, it's hit and miss as others have stated, whether a state campground will have tent only sites and varies state to state and campground to campground.