The Park is open for fishing and visitation in all the loops. Here is everything you need to know about the reopening plan. Information on further openings of currently closed backcountry and roads can be found here.
Terrestrials are the key to late summer fishing in the park but will be slow on cold mornings. Use beetles, crickets, hoppers, and ants. Fish should be looking up fairly consistently in the afternoons. Add a dropper to your chubby or hopper for increased success with fish more apt to eat underwater. Fishing in the morning can be good with buggers and small nymphs this time of the year. Focus on some faster water that carries the most oxygen when fishing in the warmer parts of the day. Attractor dry flies such as chubbies or Stimulators work great on hot afternoons in the park.
Remember the Park is barbless hooks only and to always check the 2022 regulations before headed towards these waters.
Make sure to read the Yellowstone Park Fishing Regulations before you fish.