Prices vary and make sure to get reservations soon otherwise there will be no vacancy's. Alot of people book months ahead of the summer. This is a very nice site.
There seems to be a lot of variability in prices based on a number of factors. The easier way to get a price seems to be to go to the KOA website and get a quote for the days you are looking at camping. Having said that, in general KOA is more expensive than many other campgrounds (but also has more amenities), but cheaper than most hotels.
We paid aroun $50 for a rustic tent site.
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