Wyoming ·
Firehole River Fly Fishing Report - June 7, 2026
FIREHOLE RIVER
ReportJUN 8 — 15, 2026
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Flow
271CFS
Firehole River near West Yellowstone MT
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Water Temp
68.2°F
Updated 2026-06-07
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Weather
29–62°F
Partly Cloudy
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Clarity
Clear
Check post-storm
The Firehole is running at 271 cfs with a gauge height of 3.1 ft and a water temperature of 68.2°F — warm enough to demand early-morning and late-afternoon focus, but the river is loaded with bug life right now. PMDs are building daily and White Miller Caddis flights are just getting started, making this one of the best dry-fly windows of the year before summer heat sets in.
What's Working — Hot Flies
Parachute - Blue Wing Olive #22
#22
Juju Baetis Tungsten #22
#22
Egan's Silver Bullet - Baetis #14
#14
Tungsten Split Case Nymph - PMD #20
#20
Stealth Link Mercer - PMD #20
#20
Corn-fed Caddis (CDC) Tan #20
#20
Soft Hackle Pheasant Tail Jig - Barbless #12
#12
Olsen's Peacock Blowtorch Barbless #22 - 24
#22–24
Black Zebra Midge (TBH) #20
#20
Olsen's Hare's Ear Blowtorch Barbless #20 - 28
#20–28
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Blue-Winged Olive (Baetis) | #18–22 | Peak — strongest on overcast days; Monday's cloud cover and Tuesday's front will fire these up | Midday–Afternoon |
| Pale Morning Dun (PMD) | #16–20 | Building — improving daily; nymphs and emergers outperforming dries in early stages | Late Morning–Early Afternoon |
| White Miller Caddis | #16–18 | Just Starting — first consistent flights appearing; bring nymph and emerger backups | Afternoon–Evening |
| Midge (Chironomidae) | #20–24 | Consistent — reliable all day, especially in slower flats and seams | Morning & Evening |
| Yellow Sally Stonefly | #14–16 | Sporadic — lower river stretches; worth having a dry or soft-hackle swing option | Afternoon |
| Soft Hackle Swing (general attractor) | #12–16 | Consistent — deadly between hatch windows in riffles and runs | All Day |
Best Time Window
- Dawn to 10:00 AM — Midge and early BWO activity; coolest water temps of the day; fish the slower flats and pools with small nymphs and midge patterns
- 11:00 AM to 2:00 PM Monday (overcast) — Prime BWO and building PMD dry-fly window; cloud cover suppresses water temps and keeps fish looking up; target rising fish in the meadow sections
- 5:00 PM to Dusk — White Miller Caddis flights begin, Yellow Sallies on lower river; swing soft hackles through riffles and watch for evening rises in the pools
Guide's Tip
From the benchWith water temps already at 68.2°F, time your sessions carefully — fish hard from first light until about 10am, then again from 5pm until dark when temps drop and trout become more active. Monday's partly cloudy skies are your best friend for BWO and PMD dry-fly action, so plan to be on the water by 9am. The approaching rain and thunderstorms Monday night into Tuesday will likely push a strong BWO hatch — get out early Tuesday morning before the storms build. When PMDs and Miller Caddis are just starting and fish are being selective, don't hesitate to drop down to a nymph or emerger pattern fished in the film — the Stealth Link Mercer PMD and Corn-fed Caddis CDC Tan are your bridge flies between the nymph and dry-fly game.
Main Species
Brown Trout
Rainbow Trout
Brook Trout
