Yellow Sallies and PMDs building as Wyoming's summer hatch season opens

What's biting

What's next

**The next 2–3 days**

With a full moon on June 30, expect trout to concentrate feeding activity into the low-light bookends of the day. The first hour after sunrise and the last 45 minutes before dark are typically the most productive windows when lunar pressure is high. Midday surface action may be muted even when hatches are present; nymph rigs fished through seams and below riffles are the reliable middle-of-the-day fallback on both drainages.

Yellow Sallies, flagged by Caddis Fly (OR) as a significant Western U.S. summer stonefly that is "often overlooked as other warm weather stoneflies are much larger," should continue building over the coming week if water temperatures hold in the typical late-June range for high-elevation freestone rivers. A dry-dropper setup — yellow-bodied stonefly dry over a beadhead PMD nymph — covers both the surface and mid-column feeding lanes that MidCurrent's recent Tying Tuesday coverage identifies as especially productive when multiple hatches are stacking simultaneously.

For the North Platte tailwater, afternoon PMD hatches are expected to be the most bankable window, roughly early-to-mid afternoon local time. Tailwater fish on this drainage are known for technical, pressured feeding. MidCurrent's tying notes on midge-style patterns excelling in "the clear, pressured water of stillwaters and tailraces" translate directly here — fine-diameter tippet and accurate, drag-free drifts will matter more than fly selection on many days.

Afternoon thunderstorms are a near-daily reality across Wyoming's mountain drainages in late June and July. Flylab (Substack) documents how the greater Yellowstone region can swing from near-70°F temperatures to snow within 24 hours in June; Wyoming's drainages are subject to the same rapid-change dynamic. Lightning and flash-flood potential on canyon reaches of the Wind River are real hazards. Carry a weather app, build an exit into your plan before afternoon clouds stack up, and note that fishing often picks back up in the hour after a storm passes as insects resume activity and fish move back onto feed.

If the Wind River has cleared from any late-season snowmelt, streamer presentations along undercut banks and boulder gardens through the canyon reach should find brown trout through early morning. Clarity varies depending on upstream snowpack melt timing — check current conditions before committing to a streamer day on the Wind.

Context

Late June through mid-July marks the seasonal hinge point on Wyoming's blue-ribbon trout drainages. Runoff on the Wind River — fed by high-elevation snowpack in the Wind River Range — typically clears earlier in low-snowpack years and later in heavy ones, with the last week of June representing the most variable window for wade anglers. The North Platte's tailwater sections are largely insulated from runoff fluctuation because upstream reservoirs buffer flows, making the tailwater a reliable summer destination regardless of snowpack season.

Historically, late June is when the prime summer hatch-matching season opens on both drainages. Pale Morning Duns, caddis, and Yellow Sallies typically overlap during this window, offering multi-hatch days when conditions cooperate. Caddis Fly (OR) notes that Yellow Sallies are "often overlooked as other warm weather stoneflies are much larger" — an observation that rings true on Wyoming rivers, where anglers sometimes chase the more dramatic late-spring Salmonfly and Golden Stone activity and then find themselves under-prepared for the sustained summer fishing the smaller sallies and PMDs provide through August.

No Wyoming-specific comparison signal was available in this reporting cycle, so it is not possible to characterize 2026 conditions as early, late, or on-schedule relative to prior years. Drought conditions have been noted across unspecified Western waters in early summer, and if that pattern extends into Wyoming, late-season flows on smaller Wind River tributaries could become a concern by August — though main-stem fishing on both drainages typically remains viable through the summer. Anglers planning extended visits should monitor current USGS flow data and any temporary closures before committing to a specific reach.