The runoff has started on the 'stone and will likely continue through most of June. There are better options in the area to spend some time on the water.
The Month Ahead:
The river will be blown out for most of June but late June should provide some epic action just in time for the salmonfly hatch. The brainless catching should commence about a week after flows start dropping.
Long Term Fishing Forecast:
The Yellowstone should be a great option all summer and fall. Late June and July should be a home run and August fishing will depend more on temperatures and summer weather patterns but prospects look good at the moment.