You would expect the park’s website to have all the information you need for your visit. It’s a good place to start, but we find it has shortcomings, and you’ll need more references. For a reason unknown to us, every National Park has organized it’s website differently. While they look basically the same, you can’t go from one to another and find them easy to navigate. It offers maps, including a large downloadable/printable one as well as several, “section” maps. They give you a decent over-view, but don’t try to use them for hiking, or you’ll be frustrated.
Pay close attention to the Alerts section, even though it is confusing at times. Road and area closures as well as construction will affect your visit. We were sort of amazed at how many people we talked to that were totally unaware. This year, Uncle Tom’s trail and parking lots are closed. Those are really popular spots and passing the parking lot, you have to go to Artist’s Point to safely turn around……it adds an hour or two due to the backed up traffic. Cars were all over the place, sideways in the road trying to turn around. See our review on Trip Advisor.
The website Yellowstone Up Close & Personal by John William Uhler is an outstanding piece of work displaying his dedication and love of the park. This rather massive compliation is a great resouce in planning the trip. John spends a lot of time in the park observing bears & wolves. The park website has a section on where to see wildlife. John writes reports of exactly where he parked, the time of day, and what he saw. Look at, Bear sighting reports or wolf sighting reports for details going back 10 years.