Forum Discussion
missourijan
Jul 04, 2016Explorer
Fall, in my opinion. We volunteered for 3 summers in a MT state park. May is usually cold & rainy or snowy. It can snow in September but usually not, temperatures are still decent and the crowds are gone. You don't really need reservations at Yellowstone in Sept. If you go to Yosemite and Glacier, you need reservations for campgrounds.
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