🪰 Active Hatches Today
Midges (Chironomidae)calendar
Pattern: Zebra Midge #20-24, Griffith's Gnat, Mercury Midge
⏰ Midday in winter; morning/evening in summer
Year-round staple. Most reliable winter and early spring hatch. Look for clusters of tiny midges on slack water. Green River A-section midge season is legendary Nov–Mar.
Pale Morning Dun (PMD)calendar
Pattern: PMD Sparkle Dun #16-18, Comparadun, Cripple PMD
⏰ Morning to early afternoon
Dense hatches on Frying Pan, South Platte, Madison. Morning into early afternoon. Provo River PMD June–July.
Salmonfly / Giant Stoneflycalendar
Pattern: Chernobyl Ant, Circus Peanut, Pat's Rubber Legs #4-6
⏰ Afternoon when temps peak
The Big Event. CO: Arkansas May, Roaring Fork late May. MT: Gallatin/Blackfoot June. UT: Green River June — the A-section salmonfly is one of the best hatches in the West.
Golden Stoneflycalendar
Pattern: Yellow Stimulator #8-12, Copper John, Rogue Foam Stone
⏰ Afternoon
Follows salmonfly up the river. Provo River and Logan River June golden stone hatches are strong.
Caddis (Hydropsyche/Rhyacophila)calendar
Pattern: Elk Hair Caddis #14-18, X-Caddis, Parachute Caddis
⏰ Evening
Evening hatches throughout summer. One of the most important hatches on CO/MT/UT rivers. Logan Canyon caddis May–June is exceptional.
Green Drake (Intermountain)calendar
Pattern: Parachute Green Drake #10-12, Comparadun, Green Drake Sparkle Dun
⏰ Afternoon
Major mayfly hatch across the intermountain West. Green River June, Provo River May–June, Logan River June. Dense emergences on calm water.
⚠️ Weather & Safety
Weather data sourced from NWS. Conditions change rapidly near waterways.
Radar imagery is near-real-time and may not reflect current conditions.
PeakScout weather does not replace official NWS forecasts.
Flow data: USGS NWIS. Hatch predictions: PeakScout engine using water temp + calendar + river type.
Conditions updated 2026-06-13 03:32 UTC.
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