MT Blue-Ribbon Trout on Drought Watch, Canyon Ferry Walleye Active

What's biting

What's next

With below-average snowpack and a summer forecast trending hotter and drier than normal statewide, Montana's trout rivers are entering a pivotal early-season stretch. MT FWP's virtual townhall this month made clear that the agency is mobilizing protective tools ahead of peak heat; anglers should plan their trips around that reality.

For the Yellowstone River drainage, late runoff is likely tapering off ahead of schedule. Rivers dropping to summer-low conditions earlier than average can concentrate trout into deeper lies, but it also accelerates water warming. Typical late-June hatches for this drainage include Yellow Sallies, caddis, and Pale Morning Duns; with lower flows and clearer water, fish get a longer look at every fly, so pattern selection and presentation matter more than usual. The most reliable windows are first light through mid-morning and the final two hours before dark, when surface feeding resumes and temperatures ease.

Before booking any trip to the Yellowstone watershed this summer, use the newly launched TroutCast tool alongside current USGS streamflow readings to see where conditions stand relative to historical benchmarks for late June. It was built specifically for this scenario, per MT FWP.

On the Missouri River system, the MT FWP walleye retention advisory at Canyon Ferry applies through the summer season. The agency recommends harvesting smaller fish to reduce competition within the reservoir; over time, that improves the overall size structure of the walleye population. Afternoon boat sessions on Canyon Ferry are a practical option when Yellowstone wade fishing slows in the heat of the day.

For this weekend: prioritize Yellowstone River wade sessions in the early morning, shift to Canyon Ferry for walleye in the afternoon, and confirm streamflows on any smaller tributary before committing to a stretch.

Context

In a typical late-June year for the Yellowstone and Missouri drainages, Montana's rivers are finishing the transition from peak runoff. High-country snowmelt usually keeps the upper Yellowstone running above its summer average and relatively cold well into early July, with the best dry-fly and nymph conditions arriving as flows stabilize and clarity improves. Canyon Ferry and other Missouri River impoundments typically see walleye activity picking up steadily through June as water temperatures climb into the optimal feeding range.

This year is trending ahead of that schedule. MT FWP publicly flagged below-average snowpack as the primary driver of summer concern, with the seasonal forecast running hotter and drier than the historical norm. That combination likely means the Yellowstone and its tributaries hit their runoff peak earlier than average, are already settling toward summer-low flows, and will push water temperatures into stress territory for trout sooner than a typical year. For trout anglers, the window of optimal conditions, where flows are stable and water temperatures are comfortably in the 50s Fahrenheit, may be compressed or already waning this season.

The June 1 launch of TroutCast and FWP's decision to host a public townhall on summer fishery concerns before peak heat arrived are both signals that this season warrants more active monitoring than usual. These are not routine calendar events.

No USGS gauge data is available in the current data feed to pin down exactly where flows stand relative to historical averages. Anglers planning trips should consult TroutCast at usgs.gov/apps/troutcast and current USGS streamflow readings to get an up-to-date picture before heading out.