I just got back from 3 nights in Yellowstone. Always a beautiful place to be. I've gone up there a couple of times every spring and autumn and have never seen as many people up there in October. The place feels like full on summer right now. Tons of Bison as usual, some Elk up around Mammoth, a nice herd of Pronghorn in the Lamar and a young Bull Moose in the meadows between Norris and Mammoth. The Wolf watchers were out in the hundreds up in the Lamar, I stopped and chatted with a few and they were pretty excited about wolves that were small dots in their spotting scopes, really cool to see these beautiful predators at all but not much to get excited about from a photography perspective. I did see one Grizzly way out across the Lamar river but too far for even a decent figure on a landscape type shot but still great to see.
It really is an incredible place but for folks going for their first time be prepared to drive..... a lot! And be prepared to do a lot of that driving in traffic, even pulling over to let the folks in a hurry pass on by you still get caught up in little pods of moving traffic that can make it tough to scout and tougher to pull over when you do come into a good area. I was reminded how Yellowstone feels a bit like doing wildlife photography on a morning commute as I was rarely off by myself even though I drive every possible side and dirt road (which also ended up in traffic queues). Perhaps it's just a Covid thing with a lot of folks visiting the parks and some keeping their kids out of school this fall but this is the busiest I've ever seen the park this late in the year.