March on Montana’s Missouri River rarely follows a script, and 2026 may be even less predictable than most. With a winter that has delivered little snow across the Rocky Mountain West, anglers and locals alike are watching conditions closely while hoping Mother Nature still has a few surprises left.

  • Low snowpack could mean below-average water levels and warmer water temps in March.
  • Midges are the main event, with the best shot at rising fish during calm afternoons—especially late.
  • Nymphing stays strong all month with midge patterns (black is popular; don’t ignore olive/green).
  • Streamer fishing and swinging flies can be as good as it gets pre-weed season.
  • Weather remains a wildcard: expect mid-40s, wind, and quick changes—winter gear still matters.

Lower snowpack and warming water temperatures could shape how the river fishes this spring, but March remains a month of possibility—when midge hatches begin to build, streamer fishing can shine, and the first consistent signs of spring bring trout back to the surface. Whether the weather delivers calm, productive afternoons or classic blustery Montana days, March always marks the beginning of a new fishing season on the Missouri.

For more context on how the river has been fishing leading into March, see our earlier update: Missouri River Fishing Forecast (February 2026). For broader statewide conditions and what’s working right now, you can also check the Montana Fishing Report (March 7) and the Montana Outdoor Radio Show recap (March 7).

A Different March Than Normal

The Missouri River March Fishing Forecast looks… we are holding our breath with the lack of winter that has not graced us here in the Rocky Mountain West. Below average water levels and warming water temps are what we will see this month along with more and more midge flies near the surface.

The weather, while unpredictable this year already, will grace us with both kinds of days: good ones and bad ones. The question being which kind of day do we really want. I think both.

We do need to add to our snowpack mountainside to insure adequate water flows for the summer. More snow is always better than not enough. We have not had a significant snowpack grace us this winter. Nope. Not at all. 2026 will hopefully bring a historic flush to us this spring and early summer. But that is not what the long term forecast holds. But, Mother Nature is an unpredictable creature.

Remember the high water years of ’08-’11? Four consecutive years of better than average water. While some complain when the water levels are such that the dry fly fishing does not get rolling until late July, we here on the Mo plead for that action again. The haters will hate. The hate club complains when we do not have enough water too. They hate on us when the weather is hot mid-summer and the weekend warriors from the region fill our waters with rafts, tubes, and non-fishing recreationalists.

The remainder of us must hope for the best and prepare for the worst. The worst would be a decline in snowpack depth, unseasonably warm days and, more importantly, nights. Stop. That is the end of that discussion.

The best case scenario is that we start to build an incredible late winter snowpack and it will grace us here in central Montana with the adequate water to enrich this resource. Cold nights and cooler days will help as well. A normal March would be OK. A wetter than normal March would be real good, my friends. As I have commonly asked for here on this Missouri River information blog I suggest we all take part in a rain and snow dance. In the privacy of your own home please. While your wife and kids are out. They already are suspect of your dancing style…

Missouri River MArch Forecast

Missouri River March Fishing Forecast

March is the first month of the calendar year that we can expect relatively level or predictable fishing. It is also the first month with enough daily bugs to hopefully find a few rising fish. The nymphing heats up and the streamer fishing can be as good as it gets on any given day.

Missouri River March Hatches

Midges. Maybe an occasional BWO. Skwalas? The game is midges though.

Depending on the year, and we don’t know until after it happens, the midge fishing can be damn good—meaning topwater action. The midges are thick if you dip your flies beneath the surface. The midges have already been present for enough days to get the juices flowing in our resident dry fly gang. We hope that March will bring several days of great action. It’s kinda one of those things or events that you cannot plan for. You just have to be here on the right day, when the planets and moons align.

Nymphing is real good with any number of subsurface patterns. Black is the most popular color, but do not forget to include an olive or green midge pattern. Both deep nymphing techniques with some adjustment of distance from bobber to fly, or split. The midge fly is something that may be attached to your rig all month long.

If the month is inordinately warm we will see some BWO’s popping here and there. The water temps would have to move toward 40F and beyond to see more than a few. Don’t hold your breath. But if we see a bundle of them then we are headed the wrong direction as far as weather and precipitation goes.

Skwalas? Oh maybe. Again, the later in the month would be more of a draw. We don’t have a ton of them anyway. But the fish will come to the topwater offer if you trust it for 8 hours a day. You gotta believe.

Missouri River March Weather

The daily air temps are nearly 10 degrees higher than the previous month. The historic precipitation is up as well. March generally brings nearly an inch of rain. And we will take it. How about more than an inch this March. Remember that snow/rain dance you promised to do?

Still prepare for any mountain, Rocky Mountain, conditions when fishing the month of March in Montana. It can change in a heartbeat. Full winter gear should always nearby when fishing the Mo this time of year.

Expect temps in the mid 40’s and some wind. The ubiquitous Montana wind. We have never liked it. But, a necessary evil for sure.

What to Expect Fishing the Missouri in March

A crap shoot really. Mostly good with some not so good. If the non-existent winter is any indication the fishing can go either way during the day. Mostly hit and miss is what we hear from the anglers coming back in and giving us a post battle report.

What we are seeing is that some days the nymphing is good, and others not as good. The streamer fishing has been more consistent…which is the strange part. Usually the other way around.

You can expect the midge to show during the calm afternoons, with certainly the late afternoons towards the last light producing a good rise. Stay out late. Get in late and stay the course.

Swing the Fly (Trout Spey Season)

Many anglers out and about during this strong Swing Season month. As you know many anglers in the shop daily looking for Trout Spey lines, iMOW tips, and our wide selection of Trout Spey demo rods. And then they are out there swinging through runs. Most are having success bringing a few to hand.

The best time to swing the fly on this river is pre-weed. The weeds get tough as we move into July. So, if you like to toss the two handed rod come on out and get on the water this month. April too. May too. Good action will be had until the aquatic vegetation becomes overwhelming.

March Means More Anglers (and a New Season Feel)

Montana’s Missouri River heats up in March. More anglers appear as the weather continues to become more springlike as the month progresses. Call the shop for details on the guide trips and any questions you may have about specific lodging options. A full day fishing with lunch and drinks. All terminal tackle included. All you need is your new ’23 Montana fishing license and a smile. 2026 Fishing Licenses are available online.

Headhunters is your One Stop Fly Fishing Spot. Visit www.craiglodging.com and www.craigtroutcamp.com for the best selection of Missouri River lodging. Shop here at CraigFlyShop.com.

Headhunters Fly Shop March ’26

Open daily @ 8am. March is a fun month as we see many summer items coming into the store daily. John tells me that the fly selection is growing weekly. 10’s of 1000’s of 100,000’s, actually millions of flies have passed in and through the Headhunters front door. Now is the time that the direction will change as they make their way out the door and onto the water.

New stuff from all kinds of vendors including Skwala, Sage, Rising Nets, RIO, OPST, Galvan, Buff, Fishpond, Howler Bros, Headhunters Logo Gear, and so many more coming in daily. Rental boats sitting in the yard until you take them out. Guides at the ready. Shop staff making coffee. All smiles all the way around. See you in Craig, in March!

Feature Photo: AI-generated

FAQ: Missouri River Fishing in March

Is March a good time to fish the Missouri River in Montana?

Yes—March is described as the first month of the year when fishing can feel relatively level or predictable, with enough daily bugs to find some rising fish and strong opportunities for nymphing and streamer fishing.

What hatches should I expect on the Missouri River in March?

Midges are the primary hatch. You might see an occasional BWO, and possibly skwalas later in the month, but midges are the main focus.

When is the best time of day for rising fish in March?

Calm afternoons can bring midges to the surface, and late afternoon into last light is specifically called out as a prime window for a good rise. The advice: stay out late.

What nymph colors and patterns are emphasized for March?

Black is the most popular midge color, but the forecast also recommends including an olive or green midge pattern. Midges may stay on your rig all month.

Will BWOs show up on the Missouri River in March?

Only if March becomes inordinately warm. The text notes water temperatures would need to move toward 40°F and beyond to see more than a few, and cautions not to count on it.

Is streamer fishing good on the Missouri in March?

Yes—streamer fishing is highlighted as potentially “as good as it gets” on any given day, and it’s described as being more consistent than nymphing so far (which is noted as unusual).

Is March a good month for swinging flies (Trout Spey) on the Missouri?

Yes—March is described as a strong “Swing Season” month, with anglers swinging through runs and finding success. Pre-weed season is called the best time to swing.

What weather should I plan for on the Missouri River in March?

Expect mid-40s, wind, and rapid changes. Even though March trends warmer than the previous month, full winter gear is still recommended because conditions can change quickly.

Related Reading

Topics
Montana Fishing Reports

You Might Also Like