Fly fishing the Missouri River in June is about as good as it gets in Montana. The snowmelt has cleared the reservoirs, the dam releases are stabilizing, water temperatures are climbing into the sweet spot, and the hatches. The hatches that make this river famous are in full swing. For anglers planning a trip to Craig, Montana, June offers one of the most reliable and rewarding windows of the entire year.
But June on the Missouri River has two distinct personalities, and knowing which one you’re showing up for changes everything about how you fish it.
Early June vs. Late June: Two Different Missouri River Experiences
Early June (June 1–15): Higher Water, Nymphs, and Opportunity
The first half of June on the Missouri can still carry elevated flows from snowmelt moving through the upstream reservoirs. Flows in the 5,500–8,500 CFS range are common, and some years push higher. That’s not a reason to stay home — it’s a reason to adjust.
When the Missouri is running big and fast, trout leave the main current and stack in predictable soft-water lies: the inside of bends, eddies behind islands, slow inside seams, and the edges of structure. On a guided float, your guide knows exactly where those fish go, and a drift boat can cover miles of that water efficiently.
What’s producing: Heavy nymph rigs dominate early June Missouri River fishing. Two-fly weighted rigs with wire worms, scuds, and PMD nymphs in slower water can generate impressive numbers. Worm patterns, pink San Juan worms are a legitimate early-June weapon on the Missouri. Rain events and rising water flush real worms into the river, and the trout know it.
Blue-Winged Olives can still hatch in early June. If you see BWOs coming off and trout starting to nose up, don’t be afraid to switch to a dry.
Late June (June 16–30): Prime Time on the Missouri River
When flows drop and stabilize , the Missouri River shifts into prime dry fly season. This is what people mean when they talk about fly fishing the Missouri River in June.
PMD hatches intensify. Caddis are coming off in the evenings. The river is floatable and wadeable. The fish are feeding on the surface. The crowds that show up for this are showing up for good reason.
Missouri River June Hatches: What You Need to Know
Pale Morning Duns (PMDs) — The Main Event
PMDs are the defining hatch of Missouri River June fishing, and they are as good as advertised. These size 16–18 mayflies emerge mid-morning through early afternoon, with the best action on overcast or slightly cloudy days. When the sun goes behind clouds on the Missouri in late June, the fishing can be like a light switch , pods of fish appear across the flats and start sipping.
The trout get selective. They’re seeing thousands of PMDs daily and they know the difference between a well-presented fly and a bad one. A few things matter most:
- Fly first. Your fly needs to arrive before your leader or tippet. Use longer 12–14 foot leaders and fine 4X or 4.5X tippet.
- Match the stage. Missouri River trout often key on emergers and cripples rather than fully hatched adults. Carry PMD cripples (Harrop’s, Film Critics, Last Chance Cripples), CDC emergers, and PMD Sparkle Duns alongside your standard spinner patterns.
- Spinners matter. The PMD spinner fall happens in morning hours and can bring fish up that ignore the dun hatch entirely. A rusty spinner in size 16–18 is worth having rigged.
Caddis — Evening Magic on the Missouri
Caddis activity on the Missouri River ramps up significantly through June, especially in the lower reaches below Craig and in the canyon section. The X-Caddis, Elk Hair Caddis, and Corn Fed Caddis in sizes 14–16 are workhorses.
The best caddis fishing happens in the evening, the last two hours of light can produce some of the most aggressive, explosive dry fly eats of the entire Missouri River June season. Stay on the water later than you think you need to.
Blue-Winged Olives — Early June Bonus
BWOs taper off as the month progresses, but in early June on overcast or rainy days, they can still generate genuine hatch fishing on the Missouri. Size 18–20 parachute BWOs, CDC duns, and Sparkle Duns cover most situations.
Nymphs Below the Surface — All Month Long
No matter how good the dry fly fishing gets in June, sow bugs, scuds, PMD nymphs, caddis larvae, and midges are producing fish below the surface all month long. On slow mornings before hatches begin, a two-fly nymph rig accounts for a lot of Missouri River trout. Don’t abandon the indicator setup just because it’s June.
Where to Fish the Missouri River in June
The Classic Floats: Holter Dam to Cascade
The bread-and-butter Missouri River floats. Holter Dam to Craig , Wolf Creek to Spite Hill, or find solitude from Prewitt creek to Cascade. The sections from Holter Dam to Craig and Craig to Stickney Creek are among the most busy with anglers.
Walk and Wade Fishing in June
In late June when flows drop, wade fishing the Missouri River becomes not just possible but excellent. The flats and shorelines below Wolf Creek Bridge and around Craig offer wade anglers the chance to sight-fish to rising trout — one of the most satisfying experiences in fly fishing. Walk and wade trips with a guide can put you on fish you’d never find on your own.
The Land of Giants — June Below Hauser Dam
The tailwater below Hauser Dam holds some of the largest trout in the Missouri River system. Late June is a productive month here, with rainbows averaging 18–22 inches being common. Jet boat access to the Land of Giants opens sections of water that most anglers fishing the Missouri River in June never reach.
Gear and Tackle for Missouri River Fishing in June
Rods: A 9-foot 5-weight covers 90% of what you’ll do dry fly fishing in June. If you’re primarily nymphing with heavier rigs or longer leaders, or 10-foot 4 or 9- foot 6-weight gives you added reach and indicator control.
Leaders and Tippet: Go longer than you think you need for dry fly fishing. A 12–14 foot leader in 3X with 4.5X tippet off the tag end is standard for technical PMD fishing on the Missouri. For nymphing, standard 9-foot leaders work well with added tippet to adjust depth.
Fly Box Essentials for Missouri River June Fishing:
- Parachute, Hi Viz Spinner, Cripple — sizes 16–18
- CDC PMD Emerger — sizes 16–18
- Rusty Spinner — sizes 16–18
- X-Caddis, Elk Hair Caddis, Corn Fed Caddis — sizes 14–16
- Parachute BWO, CDC Dun — sizes 18–20
- Split Case PMD, Jigged Hare’s Ear, Frenchie — sizes 16–18 (nymphs)
- Sow Bug, Scud — sizes 14–16
- San Juan Worm, Wireworm ( crimp those barbs) — sizes 10–12 (early June)
- Small buggers and soft hackles for streamer/swing work
Clothing: Layers in early June , mornings can be cold and afternoon thunderstorms are possible. Bring a rain jacket. Late June warms up quickly; sun protection (gloves, sun shirt, hat, sunglasses) becomes important on full-day floats on the Missouri.
Planning a Missouri River Fly Fishing Trip in June
When to Book
June Missouri River trips, especially late June fill up fast. Most guides and outfitters see their June slots claimed a year in advanced. If you’re thinking about a late June trip, now is the time to reach out. Early June typically has more availability and the fishing is underrated.
Float vs. Wade in June
Early June with higher flows: float trips give you the most water coverage and the best access to soft-water fish on the Missouri River.
Late June: either approach works well. Wade anglers who want to sight-fish rising trout have a real opportunity when flows drop. Float trips cover more water and give you access to more varied water types throughout the day.
How Many Days on the Missouri River in June?
Two days minimum to get a real feel for fly fishing the Missouri River in June. Three or more days lets you experience the range of the fishery, maybe a float one day and a Land of the Giants the next, or different sections of the river. The Mo rewards time.
June Crowds on the Missouri River
The Missouri River in late June is not a secret. Craig, Montana fills up on summer weekends. On busy floats, fish can see a lot of flies. This is why presentation matters more than almost anything else.
Weekday trips are can be quieter but not by much. If you have flexibility, a Tuesday-Wednesday float on the Missouri River in June can feel like a completely different river than the same weekend trip.
Is June a Good Time to Hire a Guide on the Missouri River?
June is one of the best months to hire a guide for Missouri River, especially for first-time or infrequent visitors. The hatches are dense, the techniques can be technical, and local knowledge about where fish are holding especially in early June with higher flows is worth far more than time spent learning by trial and error.
Call (406) 465-1688
For real-time conditions and what’s currently producing, see our Missouri River June fishing report. For a full year-round overview of the fishery, visit our Missouri River fly fishing guide.
June Fishing Report- Missouri River
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