Fly Fishing the Bitterroot River Skwala hatch.

As winter gives way to spring, the Bitterroot River awakens with some of the best dry fly fishing of the year. Anglers who venture out in March and April are rewarded with exciting hatches, eager trout, and the unique experience of fishing amidst snow-dusted banks and budding cottonwoods.

Early Signs of Life on the Water

Even in the heart of winter, anglers can spot small, dark stoneflies against the snowy streambanks. These winter stoneflies emerge on sunny afternoons when the warmth of the day is at its peak. Their nymphs play a crucial role in breaking down the leaf litter that settles on the riverbed, providing a steady food source for trout throughout the colder months. Most winter stoneflies are poor fliers, often preferring to scuttle across the water rather than take to the air, making them an easy target for hungry fish.

The Skwala Hatch: A Springtime Favorite

By mid-March, the much-anticipated Skwala stonefly hatch begins, bringing big dry fly action to the Bitterroot River. These nymphs, which grow to about 3/4 of an inch, thrive in the river’s fast, cold water. As they migrate toward the banks to emerge, trout key in on both the nymphs and the adults, making for explosive surface takes. Fishing a well-placed Skwala dry fly near grassy banks and structure can produce some of the season’s biggest brown trout.

Why March and April?

The pre-runoff conditions in March and April create some of the most ideal water levels of the season, similar to fall flows. This makes for excellent wade and float fishing opportunities. For anglers hoping to land a trophy brown trout on a dry fly, this is hands down the best time to be on the Bitterroot.

Streamer fishing can also be productive during this time, as larger trout aggressively chase down baitfish in preparation for the heavier flows of runoff. Swinging streamers through deep runs and along undercut banks can yield big rewards.

The Best Waters to Fish

Most of the guide trips during this season take place on the Bitterroot and Clark Fork rivers, where the combination of hatches and pre-runoff conditions provide optimal fishing. The upper and middle sections of the Bitterroot are particularly productive, with side channels and deep pools offering prime feeding grounds for trout.

Final Thoughts

Fly fishing the Bitterroot River in March and April is an experience unlike any other. From the early Skwala hatch to the steady emergence of BWOs and March Browns, the river comes alive with feeding trout and unparalleled dry fly opportunities. Whether you're a seasoned angler or new to fly fishing, springtime on the Bitterroot offers some of the best action of the year.

Don’t miss your chance to experience the magic of Montana’s spring hatches—tie on a Skwala, watch for rising trout, and enjoy one of the finest fly-fishing seasons the Bitterroot has to offer.