Wild Trout Outfitters -April 17,2026 Fishing Report

Spring has officially arrived in southwest Montana, and with it comes some of the best early‑season fishing of the year. Flows are rising, water temps are climbing, and trout are feeding aggressively as we move toward peak spring conditions.

April brings rising flows, hungry trout, and some of the best early‑season fishing of the year in Big Sky, Montana.

GALLATIN RIVER FISHING REPORT

Current Conditions

The Gallatin is entering early runoff. Snowpack sits around 80% of median, and flows will continue to rise. Expect several more days of good fishing before the BIG Muddy arrives.

Large nymphs or dead‑drifted streamers in the #6–10 size range are producing consistently. Patterns include Pat’s Rubber Legs, Dirty Trixie Worm, Mega Prince, Swallow, San Juan Worm, Bow River Bugger, Sparkle Minnow.

Runoff Tips: • Target slack water along banks • Use heavier tippet • Add weight until you’re close to the bottom • Fish tributary mouths • Above Taylor Fork often has better clarity.

Nymphs

Pats’ Rubber Legs #6-10, Goomy Worm #10, Mega Prince #8, Swallow#10, San Juan Worm (Red/Pink) #12, CDC Pheasant Tail #16–18, Pheasant Tail #16–18, Lightning Bug #16–18, Copper John #14–16, Dirty Bird Olive #14, CDC Emerger #14–18, Shop Vac #16-18.

Dries

X‑Caddis #12–16, Elk Hair Caddis #12–16, Parachute Adams #14–18, Purple Haze #14–18, Sparkle Dun (olive #18, brown #12.

Streamers

Sparkle Minnow #4–6, Bow River Bugger #4–6, Sculpin patterns #4–8 (white, yellow, olive, tan, black.

Outlook

The Gallatin is in the middle of its classic spring transition, and today’s conditions reflect that perfectly: rising flows, cold overnight temps, and a river that fishes best once the sun has had a chance to warm things up. While runoff is knocking on the door, the Gallatin still has a very fishable window, especially in the upper canyon and above Taylor Fork where clarity holds longer.

Daily Fishing Rhythm

Mornings remain chilly, and trout stay glued to the bottom until water temps bump a few degrees. The most productive window is late morning through mid‑afternoon, when the river stabilizes and trout begin sliding into softer feeding lanes.

If clouds roll in, the bite often improves — especially for streamers and larger stonefly nymphs.

Where Fish Are Holding Today

With flows rising and color increasing, trout are pushing into:

• Soft edges along the banks
• Inside bends with slower current
• Deep buckets below boulders
• Side channels with clearer water
• Tributary mouths where clarity improves

The canyon stretch is still the most consistent, while the lower river near Gallatin Gateway is showing more color and faster flows.

Bug Activity & Trout Behavior

This is the time of year when big meals matter. Stonefly nymphs, worms, and sculpin patterns are the main course, and trout are responding accordingly.

Current activity includes:

• Stonefly nymphs migrating toward the banks
• Worms and egg patterns producing in off‑color water
• Early caddis beginning to stage in the lower river
• Midges still present but less dominant as flows rise

Trout are feeding:

• Low and tight to structure in the morning
• Mid‑column once temps rise
• Aggressively on streamers during cloudy periods

Streamer Bite Outlook

The Gallatin’s streamer bite is improving each day as flows rise and clarity drops — perfect conditions for big browns to ambush.

Best colors today:

• Olive
• Black
• Yellow
• White (on brighter afternoons)

Short, slow strips with long pauses are outperforming fast retrieves.

Runoff Watch

Runoff is coming, but it’s not fully here yet. Today’s conditions still offer:

• Good clarity in the upper river
• Manageable flows for wading
• Excellent nymphing with larger patterns
• A growing streamer window

Once daytime highs push into the 60s for several days in a row, expect the river to turn high and dirty quickly. For now, we’re in the sweet spot — the short but productive window right before the before the BIG Muddy arrives.

Some of the largest browns of the year are caught during this period.

UPPER MADISON RIVER FISHING REPORT

Spring conditions on the Madison River as April fishing begins to heat up in Southwest Montana.

Current Conditions

Water Temp: ~39°F Flows: ~820–842 CFS Clarity: Good, 24–30 inches

The Upper Madison is fishing very well for mid‑April, with stable temps and improving clarity. Flows bumped into the mid‑800s, pushing fish into softer holding water.

Nymphs

Pat’s Rubber Legs #6–10, Pheasant Tail #12–18, $3 Dip #16–18, Zebra Midges, Rainbow Warriors, Shop Vac #16 San Juan Worm #12.

Dries

Midges on calm/cloudy days Parachute Adams #18, Purple Haze #14–18, X‑Caddis #14–16, Elk Hair Caddis #14–16.

Streamers

Sparkle Minnow #4–6, Bow River Bugger #4–6, Sex Dungeon #4, Circus Peanut #4, Home Invader #2–6 (Black, olive, tan, white).

Outlook

The Madison is settling into a classic mid‑April rhythm — cold mornings, rising midday temps, and a noticeable uptick in trout activity as soon as the water bumps even a degree or two. With flows holding in the 820–840 CFS range, the river has enough push to move fish into softer edges, but not so much that wading becomes difficult. Clarity remains solid, giving anglers a wide window to work with.

Daily Fishing Rhythm

Early mornings are still on the slow side, but as soon as the sun hits the water and temps climb, the river wakes up. From 11 a.m. through late afternoon, trout are sliding out of deep nighttime holding water and feeding more aggressively in mid‑depth seams, buckets, and the soft edges behind structure.

Where Fish Are Holding

Right now, the most productive water types are:

• Inside bends with softer current
• Seams below mid‑river boulders
• Drop‑offs and shelves with 2–4 ft depth
• Tailouts with moderate speed
• Side channels with stable clarity

The upper wade stretch from Raynolds to Three Dollar is fishing consistently, while the float stretch from Lyons to McAtee has been day‑to‑day depending on West Fork color. Even when the West Fork adds a little tint, the river remains very fishable.

Bug Activity & Trout Behavior

Stonefly nymphs are on the move, and trout know it. Rubber Legs patterns are producing all day, especially when fished tight to the bank or along slower seams. Midges are still the dominant hatch, but we’re seeing the first hints of spring caddis staging — a sign that the river is about to shift into a more active feeding cycle.

Trout are feeding:

• Low and slow in the morning
• Mid‑column by midday
• Aggressively chasing streamers on cloudy afternoons

Streamer Bite Outlook

The streamer bite is improving every day. Cloud cover, even for an hour, can flip the switch. Fish are responding best to:

• Olive
• Black
• Tan
• White on brighter days

Short strips with long pauses are outperforming fast retrieves.

Overall Outlook

The Madison is in excellent shape for April, and conditions are trending in the right direction. With stable flows, good clarity, and warming daytime temps, the next 7–10 days should offer some of the best pre‑runoff fishing of the spring. If we get a stretch of mild weather without heavy rain, expect:

• More consistent afternoon dry‑fly windows
• Stronger caddis emergence
• Increasing streamer aggression
• Bigger fish sliding into softer water to feed

This is a prime window before runoff begins to influence the system.

The walk‑wade stretch is producing well with midges and early caddis. The float stretch varies day‑to‑day depending on West Fork inflow.

Stonefly nymphs are migrating toward the banks — prime time for big trout.

Expect excellent conditions for this year’s salmonfly hatch.

YELLOWSTONE RIVER FISHING REPORT

Current Conditions

The Yellowstone is entering runoff and will remain high and off‑color for the next 3–4 weeks.

Nymphs & Streamers (Current)

Pat’s Rubber Legs #6-10, Mega Prince #8, San Juan Worm #12, Bow River Bugger #4–6, Sparkle Minnow #4–6.

Patterns to Stock Up On (Post‑Runoff)

Dries: Chubby Chernobyl #8–10, Stimulator #10–14, Elk Hair Caddis #14–16, Sparkle Dun (PMD) #16–18, Purple Haze #14–18

Nymphs: Pheasant Tail #16–18, Lightning Bug #16–18, Copper John #14–16, CDC Emerger #14–18, Shop Vac #16.

Streamers: Sex Dungeon #4 Circus Peanut #4 Barely Legal Sparkle Minnow #4–6

Outlook

The river will be high for several weeks. Check back mid‑June — the post‑runoff window is one of the best of the year.

YELLOWSTONE NATIONAL PARK FISHING REPORT

Season Opens May 25, 2026

May 1, 2026, on the Firehole, Gibbon and the Madison River

Early Season Highlights

• Firehole River – caddis & baetis hatches • Gibbon River – variable but promising • Madison inside the Park – soft hackles, nymphs, early caddis

Thermal influence on the Firehole may produce early salmonflies in early June.

Flies

Dries: Adams #18–20, Sparkle Dun #18–20, Purple Haze #18–20, Salmonfly dries #6–10, Chubby Chernobyl #8–10, Stimulator #10–14. Elk Hair Caddis #14–16, X‑Caddis #14–16, Lime Trude #14–16, Sparkle Dun (PMD) #16–18.

Nymphs: Pheasant Tail #18–20, Soft‑Hackle PT #16–18, CDC Emerger #18–20 Lightning Bug #16–20 WD‑40 #16–20, RS‑2 #18–20 Pat’s Rubber Leg #6-10, Baetis Emerger #16–20

OTHER LOCAL OPTIONS

• Clear‑flowing tributaries of the Gallatin & Madison • Hebgen & Quake Lake – chironomids, leeches, small streamers • Tailwaters remain strong during runoff

BOOK A GUIDE TRIP:

Wild Trout Outfitters 406‑995‑2975 Big Sky, Montana