Wyoming ·
Firehole River Fly Fishing Report - June 14, 2026
FIREHOLE RIVER
ReportJUN 14 — 21, 2026
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Flow
—CFS
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Water Temp
—
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Weather
31–71°F
Mostly Cloudy
💧
Clarity
Clear
Check post-storm
USGS gauge data is unavailable for today's report; water temperatures on the Firehole are running warm (reported near 68°F) as geothermal inputs intensify heading into mid-June. The river is fishing well but the window is narrowing — cool overnight lows in the low 30s are your best ally, keeping morning temps in the trout-friendly range.
What's Working — Hot Flies
Parachute - Blue Wing Olive #22
#22
Barr's Flashback Emerger - BWO #22
#22
Tungsten Split Case Nymph - PMD #20
#20
Corn-fed Caddis (CDC) Tan #20
#20
Corn-fed Caddis (CDC) Olive #20
#20
Soft Hackle Pheasant Tail Jig - Barbless #12
#12
Olsen's Straggle Stone Brown Barbless #12
#12
Egan's CDC Rainbow Warrior #22
#22
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Baetis / Blue-Winged Olive | #20-22 | Active — steady throughout the week | Morning (6–10 AM) & overcast midday periods |
| Pale Morning Dun (PMD) | #18-20 | Building — just starting, improving daily | Midmorning to early afternoon (9 AM–1 PM) |
| White Miller Caddis (Nectopsyche) | #12-14 | Just starting — expect to intensify | Evening (6–8 PM) |
| Yellow Sally Stonefly | #14-16 | Spotty — lower river stretches only | Afternoon (2–5 PM) |
| Midges | #22-24 | Steady background hatch | All day, especially early morning |
Best Time Window
- Early Morning: 6:00–10:00 AM — Coolest water temps, active Baetis hatch, rising browns on the flats
- Late Afternoon to Evening: 5:00–8:00 PM — White Miller caddis flight begins, PMD spinner fall, most productive dry fly window of the day
- Overcast Midday Windows: Any cloud cover between 10 AM–2 PM can trigger a secondary Baetis or PMD hatch — watch the sky and stay ready
Guide's Tip
From the benchWith water temps already pushing 68°F and daytime highs forecast near 66–71°F, your fishing window is tightest in the middle of the day — get on the water at first light and work the upper meadow sections near Biscuit Basin and Fountain Flats where the current is faster and temps stay a degree or two cooler. When PMDs and Baetis are on simultaneously, watch the trout's rise form: a subtle sip means they're eating emergers in the film, so switch to the Barr's Flashback Emerger or CDC Rainbow Warrior before changing flies. If the dry fly bite shuts down mid-morning, don't leave — swing a Soft Hackle Pheasant Tail through the current seams and you'll keep finding fish. Plan to be off the water by noon if the sun is blazing, and consider returning for the White Miller caddis evening flight, which can produce explosive surface action as temps cool after 6 PM.
Main Species
Brown Trout
Rainbow Trout
Brook Trout
