Yellowstone trout fishing opens as flows ease; walleye active on Canyon Ferry

What's biting

What's next

With USGS gauge 06043500 reading 1,360 cfs on the morning of June 21, Yellowstone-system flows appear to be coming off their late-spring peak. If this trend holds over the next 48 to 72 hours, wade anglers should find improving access on mid-river gravel bars and inside bends. Drift boat outfitters currently have the advantage on water clarity and reach, but the window for waders is opening.

What should turn on soon: terrestrial season. Late June is traditionally hopper-ant-beetle time on the Yellowstone and its spring-creek tributaries. As flows clear and streamside grasses dry out, grasshoppers and beetles become prime trout targets. Add size 10 to 14 foam hoppers and parachute ants to your box now. Evening caddis and PMD spinner falls are also likely as summer heat sets in; fish the riffles at dusk if air temperatures stay manageable.

Plan fishing windows around the heat, not against it. Per MT FWP's virtual townhall, summer heat is "rapidly approaching" with a hotter-and-drier-than-normal outlook. Trout stress builds when water temps push above 67 degrees Fahrenheit, and on sun-exposed sections of larger rivers that threshold can arrive by early afternoon. Productive windows this weekend and beyond will likely run 6 to 10 a.m. and again 6 to 9 p.m. Spring creeks, tailwaters, and higher-elevation tributaries that stay cooler longer are worth prioritizing if the main stem heats up.

On Canyon Ferry Reservoir in the Missouri drainage, walleye action looks solid heading into the weekend. MT FWP and Walleyes Unlimited of Montana are making a specific ask: keep the smaller fish. With fewer small walleye competing for food, larger individuals have room to grow. Jigs and bottom-bouncing rigs worked along structure near deeper channels are typical summer approaches. Check current MT FWP regulations for size and possession limits before heading out.

Finally, bookmark TroutCast at usgs.gov/apps/troutcast, announced by MT FWP in early June specifically for Montana's blue-ribbon rivers. A quick check before committing to a float or wade outing can flag whether your target reach is trending toward thermal stress conditions, a resource that will earn its keep as July approaches.

Context

Late June on Montana's Yellowstone and Missouri drainages typically represents one of the more reliable fishing windows of the year. Runoff winds down, PMD and caddis hatches become consistent, and hopper season kicks in across Paradise Valley spring creeks and upper-river reaches. The conventional expectation is for flows on the upper Yellowstone to clear into prime wading territory sometime in mid-to-late June, with streamer and dry-fly action building through early July.

This season carries a lower-snowpack asterisk. MT FWP's virtual townhall noted that winter snowpack was below average, which typically means runoff volume ran lighter than historical norms. Flows may clear faster than usual, but they may also drop lower and warm faster as summer progresses. The agency's hotter-and-drier seasonal forecast suggests the quality window between clearing flows and thermally stressed afternoons could be narrower than anglers are accustomed to.

The Hatch Magazine guide to fishing through drought conditions points out that on similarly affected western rivers, anglers shift toward tributaries and high-elevation reaches that maintain cooler water longer into the summer. That same playbook applies here: the Yellowstone headwaters and spring-fed creeks in the Paradise Valley tend to hold temperature better than wide, sun-exposed main-stem sections during heat events.

Canyon Ferry Reservoir's walleye story offers useful historical context. Per MT FWP, the first walleye in Canyon Ferry was captured in 1989, meaning the population has spent nearly four decades establishing itself. The agency and Walleyes Unlimited of Montana are now at the quality-management stage, actively encouraging harvest of smaller fish to shift the population toward larger size classes. That kind of targeted regulation is a sign of a mature, self-sustaining fishery, not a stressed one, and summer jigging patterns through June are historically productive.

No charter or tackle-shop reports were available for this specific region and reporting window. Conditions described here reflect MT FWP agency reporting and USGS gauge data only.