Free Resource · Updated 2026
The complete fly hatch chart for Wisconsin's best trout rivers. From the legendary Brule River and Driftless spring creeks like the Kinnickinnic, Tomorrow River, and Mecan River, to the north-woods Wolf River and Prairie River home of the Hex hatch — select your river for peak hatch timing, fly pattern recommendations, and current month highlights for 2026.
Wisconsin Hatch Calendar — Quick Reference
Wisconsin Streams
Kinnickinnic · Pine River
Southwest Wisconsin's Driftless Area escaped the last glaciation, leaving a landscape of spring-fed limestone creeks with cold, stable temperatures year-round — 50–55°F even in summer. The Kinnickinnic in St. Croix County and the Pine River in Richland County are the most accessible examples. Dense wild trout populations, predictable hatches, and technical dry fly fishing on clear, spring-fed water make these creeks some of the finest in the Midwest.
Brule River · White River · Wolf River
Remote north-woods rivers draining Lake Superior and the central highlands hold wild brook trout, brown trout, and steelhead. The season is compressed but intense — hatches arrive later than the Driftless but fire densely in May and June. The Brule is Wisconsin's marquee steelhead river in fall and spring; the Wolf is the premier Hex destination in late June and early July on warm, calm evenings.
Prairie River · Oconto River · Namekagon River
Larger freestone systems in central and northern Wisconsin with a mix of resident trout and seasonal salmon. Hatches track air temperatures closely, running later than spring creeks. The Namekagon is a National Wild and Scenic River with exceptional brook trout habitat. Fall Caddis fishing on the Oconto and Prairie River is a highlight through mid-October, often with fewer crowds than peak summer.
The Why Behind the Chart
Ephemerella subvaria
Wisconsin's first significant dry fly hatch of the season signals that trout are looking up again after a long winter. Hendricksons emerge in the afternoon when water temperatures push into the mid-40s°F — typically between 2–5pm on sunny April days on Driftless spring creeks like the Kinnickinnic and Tomorrow River. North-woods rivers like the Brule and Wolf follow in early May. Fish the dun in the film; rising fish key on the helpless emerger just before the hatch fires.
Recommended: #12–14 Hendrickson Comparadun, Pheasant Tail Nymph
Ephemerella dorothea
Wisconsin's most reliable and longest-running evening hatch. Sulphurs begin on Driftless spring creeks in late May and run through July, firing around 7pm as light fades. On spring creeks like the Kinnickinnic and Mecan River, the hatch is dense enough that trout become selective — presentation and drift matter as much as pattern. Fish the sparkle dun or cripple in the tail-outs and smooth glides where sipping fish set up.
Recommended: #16–18 Sulphur Sparkle Dun, CDC Sulphur Emerger
Hexagenia limbata
The signature Wisconsin hatch and one of the great dry fly events in American fly fishing. Massive cream-and-yellow mayflies — #4–6 — emerge after dark when water temperatures reach the mid-60s°F. The Wolf River and Prairie River are the premier Hex destinations; the Brule and Mecan River also produce. Big brown trout that feed deep all year come up for the Hex — you'll hear the slurps before you see them. Bring a headlamp and fish until you can't see. Exact timing is impossible to predict without local intelligence.
Recommended: #4–6 Hex Paradrake, Cream Wulff, Spent Hex Spinner
Hydropsyche sp. / Brachycentrus sp.
Wisconsin rivers carry dense caddis populations from Mother's Day through late summer. The "Grand Caddis" in May marks the peak emergence on most rivers — a blizzard of tan and olive caddis that can trigger the year's most frantic surface feeding. Caddis fish throughout the day, with the best action typically at dusk as adults skitter across the surface laying eggs. Across all stream types from the Brule to the Namekagon, an Elk Hair Caddis is one of Wisconsin's most productive dry flies.
Recommended: #14–16 Elk Hair Caddis, X-Caddis, Partridge Soft Hackle
Baetis sp.
Wisconsin's most versatile and weather-sensitive hatch — present on every stream type, firing in two seasonal windows. Spring BWOs appear in April and May; fall BWOs return September through October. Both windows produce best on overcast, drizzly days when light levels are low and trout feel safe rising in the film. On tailwater sections of the Kinnickinnic and Brule, BWOs can produce even in winter. When the weather looks ugly, think BWO.
Recommended: #18–22 Sparkle Dun, RS2 Emerger, Parachute Adams
Isonychia bicolor
Wisconsin's best fall dry fly hatch and a hidden gem compared to spring hatches. Isonychia are large (#12–14) mahogany-colored mayflies that emerge on fast runs and pocket water in September and October — often at midday when fall light warms the surface. Brown trout feed aggressively on these big flies, especially on the Brule River, Kinnickinnic, and Wolf River. Fall Isonychia fishing often coincides with the best weather of the year and nearly empty rivers.
Recommended: #12–14 Mahogany Dun, Slate Drake, Iso Comparadun
Wisconsin's hatch season opens with Blue-Winged Olives and early Midges in March and April on Driftless spring creeks. The Hendrickson hatch in late April and May is the first major mayfly event, signaling that dry fly season has truly arrived on rivers like the Kinnickinnic, Tomorrow River, and Brule. March Browns follow in May on freestone streams alongside the first dense Caddis emergences.
Wisconsin's crown jewel is the Hexagenia limbata night hatch — massive cream mayflies that bring the biggest brown trout to the surface on warm June and July evenings. The Wolf River in Langlade County and the Prairie River are the state's premier Hex destinations, but the Mecan River and Brule also produce. Timing the Hex requires real-time water temperature and local intelligence — exactly where FlyFishFinder delivers an edge.
Sulphurs run from June through July on Driftless spring creeks. August brings Trico spinner falls and excellent terrestrial fishing with hoppers and beetles. Fall delivers a remarkable second act: Isonychia (Mahogany Dun) hatches in September–October, followed by returning BWOs through late October. Use FlyFishFinder's flow alerts and Prime condition indicators to know when your target Wisconsin river is fishing at its peak.
See Live Wisconsin River Conditions →Common Questions
The Hexagenia limbata hatch typically fires from late June through mid-July on Wisconsin's north-woods rivers. The Wolf River and Prairie River in Lincoln and Langlade counties are the most reliable destinations. The hatch happens at dusk and after dark when water temperatures reach the mid-60s°F — big, creamy mayflies that draw the largest brown trout to the surface. Driftless spring creeks like the Mecan and Tomorrow River can also produce good Hex fishing on warm June evenings.
May is Wisconsin's prime mayfly month. Carry Hendrickson Comparaduns (#12–14) for afternoon hatches, Elk Hair Caddis (#14–16) for evening caddis activity, and a Pheasant Tail nymph for between hatches. On Driftless spring creeks like the Kinnickinnic and Tomorrow River, Sulphurs begin late in the month. March Browns (#10–12) work on freestone streams mid-month.
The Driftless Area of southwestern Wisconsin escaped the last glaciation, leaving a landscape of spring-fed creeks with stable, cold year-round temperatures. Rivers like the Kinnickinnic, Tomorrow River, and Mecan River maintain 50–55°F water through summer, supporting dense wild trout populations. The limestone-influenced water chemistry creates exceptional insect life and the most consistent hatch activity in the state — particularly for Hendricksons, Sulphurs, and the legendary Hex.
Driftless spring creeks run 1–2 weeks earlier in spring due to stable groundwater temperatures. Hendricksons appear in late April on the Kinnickinnic and Tomorrow River before they show on the Brule or Wolf River. North-woods rivers track air temps more closely and have shorter but intense hatch windows. The Hex hatch on the Wolf River can be spectacular but is tightly compressed into 2–3 peak weeks in late June and early July.
The Brule River in Douglas County is a top-to-bottom trout and steelhead fishery. In spring, carry Hendrickson Comparaduns and Blue-Winged Olive Sparkle Duns. Summer Hex hatches fire in late June — bring #4–6 Hex Paradrakes for evening fishing. Caddis are reliable May through August. In fall, BWOs and Mahogany Duns (Isonychia) provide excellent dry fly action through October. Streamers work year-round for the Brule's large resident brown trout.
May and late June are Wisconsin's peak months. May delivers the first major Hendrickson and Caddis hatches on spring creeks. Late June brings the legendary Hex hatch to the Wolf and Prairie rivers — the biggest dry fly event of the year. Fall (September–October) offers excellent Isonychia and BWO fishing with fewer crowds. Tailwater rivers like the Kinnickinnic fish year-round with midges and nymphs even in the coldest months.
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