Free Resource · Updated 2026
The complete fly hatch chart for Minnesota's top trout rivers and streams. From the Driftless Area limestone spring creeks — Whitewater River, Root River South Branch, and Root River South Fork — to the scenic North Shore tributaries Cascade River, Temperance River, and Baptism River, and the Straight River in south-central Minnesota — select your river below for peak hatch timing, fly pattern recommendations, and current month highlights for 2026.
Minnesota Hatch Calendar — Quick Reference
Minnesota Streams
Whitewater River · Root River (South Branch)
The crown jewels of Minnesota fly fishing — limestone-influenced spring creeks in the Driftless Area with stable, groundwater-driven temperatures that keep flows cold and clear year-round. Hatches are more consistent and predictable here than anywhere else in the state. Hendricksons arrive in late April, Sulphurs run May through July, and fall brings Isonychia and BWOs into October. These streams fish like small Pennsylvania limestone creeks and reward technical presentation over brute coverage.
Cascade River · Temperance River · Baptism River
Short, steep, freestone streams cascading down the ridges of northeastern Minnesota into Lake Superior. They're cold, fast, remote, and home to wild brook and rainbow trout. The hatch season is compressed — Caddis from May through August is the primary dry fly event, with BWOs in spring and fall. Access requires hiking in steep terrain, but these streams offer an entirely different experience from the Driftless — more rugged, more remote, and visually stunning.
Straight River · Root River (South Fork)
The Straight River in Faribault County has a spring creek character with stable, cold flows and consistent Caddis and Sulphur hatches through summer. The Root River South Fork runs through the bluff country of Fillmore County — a productive Driftless tributary with great Hendrickson, Sulphur, and fall Isonychia fishing, and somewhat less pressure than the popular South Branch.
The Why Behind the Chart
Ephemerella subvaria
The first significant dry fly hatch of the Minnesota season and a signal that spring fishing has arrived on the Driftless spring creeks. Hendricksons hatch on sunny April afternoons when water temps climb into the mid-40s°F — typically between 2–5pm. On the Whitewater River and Root River's South Branch, this hatch fires before leaf-out, providing rare visibility into the stream and opportunity to spot rising fish in the cold, clear water. Fish the dun pattern in the afternoon and a Red Quill spinner at dusk.
Recommended: #12–14 Hendrickson Comparadun, Red Quill Spinner
Ephemerella dorothea
Minnesota's most reliable and longest-running evening hatch on the Driftless spring creeks. Sulphurs fire around 7–8pm from late May through July, creating the classic evening rise that every dry fly angler lives for. On the Whitewater River and Root River, the hatch is dense enough that trout become highly selective — one size or color off can mean the difference between a great evening and a fishless frustration. Fish the glides and tail-outs; use 6X tippet and a short leader for drag-free drifts.
Recommended: #16–18 Sulphur Parachute, Sulphur Sparkle Dun, CDC Cripple
Hydropsyche sp.
The most widespread hatch in Minnesota — present on every stream type from Driftless spring creeks to North Shore tributaries. Evening Caddis hatches on the Brule River, Root River, and Namekagon produce aggressive surface rises from May through August. Unlike mayflies, Caddis skitter and bounce on the surface during emergence, so a slightly dragging fly often triggers strikes that a perfect drift would miss. Carry both adult and emerger patterns; a soft hackle wet fished in the film often outfishes the dry during the peak of the hatch.
Recommended: #14–16 Elk Hair Caddis, X-Caddis, Soft Hackle Wet
Tricorythodes sp.
A summer morning ritual on Minnesota's spring creeks that begins at first light and is often over by 9am. Trico spinner falls on the Whitewater River and Root River can be extraordinarily dense — thousands of tiny spent spinners drifting in the film while trout sip them with maddening subtlety. Use 6X or 7X tippet, approach from downstream on your knees, and target individual rising fish. The visual challenge of a flat-water Trico hatch is one of fly fishing's most demanding and satisfying puzzles.
Recommended: #22–24 Trico Spinner, CDC Trico, Griffith's Gnat
Isonychia bicolor
Minnesota's best fall hatch and one of the most underrated in the region. Isonychia — also called Mahogany Dun or Slate Drake — are large, fast-swimming nymphs that hatch in the riffles and runs in September and October. The hatch produces aggressive surface feeding from trout that are stacking on pre-winter calories. Unlike the delicate Trico or Sulphur, Isonychia triggers bold, splashy rises — some of the most dramatic dry fly action of the entire season. The Root River South Branch and South Fork are excellent fall destinations.
Recommended: #12–14 Isonychia Comparadun, Parachute Adams, CDC Dun
Baetis sp.
Minnesota's most season-extending hatch — present on every stream type in spring and fall, and most active on overcast, drizzly days when the fish sense lower light and feel safe rising. BWOs hatch in two windows: April through May and again September through November. On the Straight River and Brule River, they fish well even on cold, blustery fall afternoons that send other anglers off the water. When Minnesota weather turns gray and cold, think small olive emergers — the fish will be looking up.
Recommended: #18–22 Sparkle Dun, RS2 Emerger, CDC Dun
Minnesota's best dry fly fishing is anchored in the Driftless Area of the southeast, where spring-fed limestone streams like the Whitewater River and Root River support consistent hatches throughout the season. Spring opens with Midges and early Blue-Winged Olives, followed by the classic eastern hatch sequence: Hendricksons in late April, Sulphurs in May and June, and reliable Caddis hatches that keep fish looking up through midsummer.
The Brule River on the Wisconsin border is a legendary stream that deserves its own pilgrimage — excellent wild brown and brook trout with hatches that rival the best in the Great Lakes region. The North Shore streams — Cascade River, Temperance River, and Baptism River — offer a completely different experience: short, steep, remote, and wild, with cold water and native brook trout in dramatic Lake Superior tributary settings.
Fall fishing on the Driftless spring creeks comes alive with Isonychia (Mahogany Dun) and returning Blue-Winged Olives through October — some of the finest and least-crowded dry fly fishing of the entire season. Use FlyFishFinder's flow alerts to know exactly when your target river is running at prime conditions.
See Live Minnesota River Conditions →Common Questions
Southeast Minnesota's Driftless Area holds the state's finest dry fly fishing. The Whitewater River and Root River (South Branch) are limestone-influenced spring creeks with consistent hatches throughout the season. The Brule River (Wisconsin border) is a legendary stream with a storied history. For wild brook trout in remote settings, the North Shore streams — Cascade River, Temperance River, and Baptism River — offer short but dramatic freestone fishing in Lake Superior tributaries.
Sulphurs are the backbone of the summer hatch season on Minnesota's Southeast spring creeks, typically running from late May through July. The hatch fires in the evening — usually around 7–8pm — and intensifies at dusk. The Whitewater River and Root River's South Branch are the most consistent producers. On cool, overcast evenings the hatch can start earlier and run longer. Size #16–18 Sulphur Parachute or Sparkle Dun are the go-to patterns.
Isonychia (Mahogany Dun or Slate Drake) is one of the best fall hatches in Minnesota, typically running from September through October. These large (#12–14) slate-gray mayflies hatch in the faster water — riffles and runs — and produce some of the most aggressive surface feeding of the fall season. The Root River South Branch and South Fork, and the Straight River all produce good Isonychia fishing. An Isonychia Comparadun or Parachute Adams in #12–14 is the right choice.
North Shore streams (Cascade River, Temperance River, Baptism River) are short, steep, freestone Lake Superior tributaries — quite different from the gentle limestone spring creeks of Southeast Minnesota. They're cold, fast-moving, and support primarily wild brook trout. The hatch season is compressed: Caddis from May through August is the main event, with BWOs in spring and fall. Access can be challenging due to steep terrain, but the scenery and wild fish make it worthwhile.
The Whitewater River is a classic Driftless spring creek that fishes like a miniature version of a Pennsylvania limestone stream. In April carry Hendrickson Comparaduns (#12–14). May through July is Caddis and Sulphur territory — Elk Hair Caddis (#14–16) and Sulphur Parachute (#16–18) cover most situations. August brings Trico spinner falls at first light (#22–24). Fall means Isonychia (#12–14) and BWOs (#18–22). Fish use 6X tippet in the clear, flat pools.
May through June is the peak window — Hendricksons, Caddis, and Sulphurs overlap for excellent dry fly fishing on the Driftless spring creeks. The Sulphur hatch peaks in June on the best spring creeks. Fall (September–October) is underrated — Isonychia and BWO hatches produce great fishing with far fewer crowds than the summer months. The Brule River is excellent in both spring and fall for wild brown and brook trout.
FlyFishFinder combines hatch knowledge with live gauge alerts, Prime condition indicators, and real angler intel — so you show up on the right day, not the wrong one.
Start Your Free TrialFree Trial · Cancel Anytime · $0 Charged Today