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Brown trout in Wisconsin
Salmo trutta — introduced to Wisconsin, holding water between 54 and 66°F. Wisconsin publishes no per-species records, so the 20 waters below are this site's selection from the state's own classified trout water.
The brown trout is introduced in Wisconsin and it is the fish most of the driftless is managed for — spring creeks in unglaciated karst country, where the water comes out of the ground at a temperature that suits a fish holding 54 to 66°F and tolerating 75. Eight to sixteen inches covers most of them.
WDNR classifies its trout water by natural reproduction — Class I self-sustaining, Class II partly, Class III not at all — and publishes no species column anywhere in it. So the twenty waters below are the classified water in the larger drainage sizes a brown trout occupies, selected here and not recorded by the state. Wisconsin's limits come by category rather than by species: a bag and a season attached to the water, with an early catch-and-release season on much of it, and no separate brown trout rule to read out.
- 54–66°FWater, preferred
- 8–16"Typical length
- IntroducedIn Wisconsin
- 20Waters listed here
What it is
Salmonidae — true trout, genus Salmo · Salmo trutta
- Butter-brown to bronze flanks, paling to cream on the belly.
- Black and rust-red spots, most of them ringed in a pale halo — spots on a light ground, where a brook trout carries light marks on a dark ground.
- No vermiculations on the back, and no white-and-black edge on the lower fins.
- Tail square to very slightly forked, and largely unspotted.
Typical length in Wisconsin is 8 to 16 inches. That is a curated range for water of this kind, not an average of any survey: MDNR's abundance file counts fish per acre and per mile and records no lengths at all, and no other state on this site publishes lengths either.
Native or stocked
Introduced in the 1880s and now the fish most driftless spring creeks are managed for, reproducing without help across most of that footprint.
Where to find it in Wisconsin
Wisconsin does not publish which species each segment holds. WDNR classifies trout water I, II and III by how much of it reproduces naturally, and by nothing else. So this is not a list of waters this fish has been recorded from, and it is not presented as one: it is the state's own classified water, filtered to the drainage size this species occupies and ranked with the wildest class first. Treat it as where to start looking.
| Water | Watershed | Classified miles | Class |
|---|---|---|---|
| White River | Bad and Montreal | 73.9 | Class I — self-sustaining, no stocking |
| Kickapoo River | Kickapoo River (Driftless) | 69.8 | Class I — self-sustaining, no stocking |
| North Branch Oconto River | Oconto River | 67.8 | Class I — self-sustaining, no stocking |
| Middle Branch Embarrass River | Wolf River | 57.0 | Class I — self-sustaining, no stocking |
| South Branch Oconto River | Oconto River | 55.3 | Class I — self-sustaining, no stocking |
| Prairie River | Lake Dubay and Big Eau Pleine | 54.1 | Class I — self-sustaining, no stocking |
| Bois Brule River | Nemadji and Lake Superior shore | 53.4 | Class I — self-sustaining, no stocking |
| Popple River | Menominee River | 50.6 | Class I — self-sustaining, no stocking |
| Brule River | Brule River (Menominee) | 48.6 | Class I — self-sustaining, no stocking |
| North Fork Clam River | St. Croix and Namekagon | 40.5 | Class I — self-sustaining, no stocking |
| Coon Creek | Coon and Yellow (Driftless) | 39.2 | Class I — self-sustaining, no stocking |
| Plover River | Castle Rock and central sands | 37.8 | Class I — self-sustaining, no stocking |
| Rush River | Rush and Vermillion | 36.5 | Class I — self-sustaining, no stocking |
| North Branch Pike River | Menominee River | 35.4 | Class I — self-sustaining, no stocking |
| Otter Creek | Peshtigo River | 35.3 | Class I — self-sustaining, no stocking |
| Willow Creek | Wolf River | 34.3 | Class I — self-sustaining, no stocking |
| North Branch Embarrass River | Wolf River | 33.9 | Class I — self-sustaining, no stocking |
| Little Popple River | Menominee River | 33.1 | Class I — self-sustaining, no stocking |
| South Branch Pemebonwon River | Menominee River | 32.8 | Class I — self-sustaining, no stocking |
| Kinnickinnic River | St. Croix and Namekagon | 30.5 | Class I — self-sustaining, no stocking |
Wisconsin's classified trout water, whole
The inventory the list above was drawn from, by the state's own class.
| Class | Named waters | Miles |
|---|---|---|
| Class I — self-sustaining, no stocking | 844 | 6542 |
| Class II — some natural reproduction, stocked to maintain | 647 | 4540 |
| Class III — no natural reproduction, stocking carries it | 126 | 658 |
Where that is on the map
Every subwatershed this site covers in Wisconsin as a faint dot, and the ones holding the waters listed above lit. A coverage map with this species on it — the map on the front of the site is the map.
When to fish for it
Brown trout hold 54–66°F water and are under real stress above 75°F. On this map's own colours that band is cold, cold-transitional, cool water, which is what the river pages and the live map are painting when they run green and blue. The season follows the temperature rather than the calendar: the water is in the band early and late in the day through the summer, and all day either side of it.
Spawning: Late October into December, on gravel riffles, later in the season than the rainbow and overlapping the brook trout.
What is hatching in Wisconsin, month by month, from the same seed the app's hatch panel reasons from. These are the state's recorded hatches, not this species' — trout eat what is in the water.
| Month | Peaking |
|---|---|
| January | Aquatic Worm, Damselfly, Dragonfly, Fish Eggs, Hellgrammite, Leech and 6 more |
| February | Aquatic Worm, Damselfly, Dragonfly, Hellgrammite, Leech, Little Black Stonefly and 6 more |
| March | Aquatic Worm, Blue-Winged Olive, Damselfly, Dragonfly, Hellgrammite, Leech and 7 more |
| April | Aquatic Worm, Blackfly, Blue Quill, Blue-Winged Olive, Cranefly, Damselfly and 15 more |
| May | Alderfly, Aquatic Worm, Blackfly, Blue Quill, Blue-Winged Olive, Caterpillar and 23 more |
| June | Alderfly, Aquatic Worm, Black Ant, Blackfly, Brown Drake, Caterpillar and 31 more |
| July | Annual Cicada, Aquatic Worm, Black Ant, Caterpillar, Crayfish, Cream Cahill and 30 more |
| August | Annual Cicada, Aquatic Worm, Black Ant, Caterpillar, Cinnamon Flying Ant, Crayfish and 25 more |
| September | Aquatic Worm, Black Ant, Blue-Winged Olive, Caterpillar, Cinnamon Flying Ant, Cranefly and 22 more |
| October | Aquatic Worm, Blue-Winged Olive, Cranefly, Crayfish, Cricket, Damselfly and 13 more |
| November | Aquatic Worm, Blue-Winged Olive, Damselfly, Dragonfly, Fish Eggs, Hellgrammite and 7 more |
| December | Aquatic Worm, Damselfly, Dragonfly, Fish Eggs, Hellgrammite, Leech and 5 more |
How to catch it
Larger and slightly warmer water than brook trout will hold: undercut banks, logjams, deep bends and the shaded seams under cover. The most nocturnal of the five.
Patterns from this site's book, chosen by the insects recorded from Wisconsin's own regions and filtered to the kinds worth putting in front of this fish. Each one has its tying recipe.
- Hare's Ear Nymph nymph · #10–18 — Alderfly, Black Ant, Cream Cahill
- Pheasant Tail Nymph nymph · #12–22 — Blue Quill, Blue-Winged Olive, Damselfly
- Parachute Adams dry fly · #12–20 — Blue Quill, Brown Drake, Blue-Winged Olive
- Elk Hair Caddis dry fly · #12–20 — Grannom, Green Sedge, Little Black Caddis
- Foam Beetle terrestrial · #12–18 — Black Ant, Cricket, Grasshopper
- Prince Nymph nymph · #10–18 — Green Sedge, Isonychia / Slate Drake, Little Black Stonefly
- Rusty Spinner dry fly · #14–20 — Cream Cahill, Isonychia / Slate Drake, Light Cahill
- Chubby Chernobyl dry fly · #8–14 — Annual Cicada, Giant Black Stonefly (Salmonfly), Golden Stonefly
- RS2 emerger · #16–24 — Blue Quill, Blue-Winged Olive, Midge
- Griffith's Gnat dry fly · #18–24 — Blackfly, Midge, Cinnamon Flying Ant
- LaFontaine Sparkle Pupa emerger · #12–18 — Grannom, Green Sedge, Little Sister Caddis
- Partridge & Orange Soft Hackle wet fly · #12–18 — Alderfly, Little Black Caddis, Little Sister Caddis
Rules for brown trout in Wisconsin
Wisconsin does not publish its limits split by species: the bag and the season apply to trout as a group, by the class or category the water carries. So what follows is that, and not a brown trout rule dressed up as one. Snapshot taken 2026-08-16.
| Category | Bag | Season | Waters |
|---|---|---|---|
| 5 Trout in Total of Any Length | 5 trout in total of any length. | First Saturday in April at 5:00 a.m. to Oct. 15. | 1614 |
| 5 Trout in Total of Any Length | 5 trout in total of any length. | First Saturday in April at 5:00 a.m. to Oct. 15. | 1126 |
| 3 Trout in Total Over 8 inches | 3 trout in total over 8". | First Saturday in April at 5:00 a.m. to Oct. 15. | 69 |
| Length, Bag and Possession Limits Vary by Water | 5 trout in total; only one may be greater than 12" | First Saturday in April at 5:00 a.m. to Oct. 15. | 64 |
| Length, Bag and Possession Limits Vary by Water | 3 in total: brown and rainbow trout over 12", brook trout over 8". | First Saturday in April at 5:00 a.m. to Oct. 15. | 13 |
| Length, Bag and Possession Limits Vary by Water | All trout caught shall be immediately released. | First Saturday in April at 5:00 a.m. to Oct. 15. | 9 |
The full Wisconsin regulation page →
Habitat notes
Larger and slightly warmer water than brook trout will hold: undercut banks, logjams, deep bends and the shaded seams under cover. The most nocturnal of the five.
- 54–66°F preferred
- 75°F upper limit
- cold, cold-transitional, cool on this map's colours
The four thermal classes named there are the ones every river on this site is painted with, at breaks of 58, 64 and 70°F. A river page showing cold water is showing water inside this fish's band; that is the whole point of the colour.
The other trout in Wisconsin
- Brook trout in Wisconsin Salvelinus fontinalis
- Rainbow trout in Wisconsin Oncorhynchus mykiss
- Lake trout in Wisconsin Salvelinus namaycush
Brown trout in the other states
The same fish, on different water and under different rules. Michigan's sand-bottomed rivers, Wisconsin's driftless springs, Minnesota's North Shore, Virginia's mountain brook water and North Carolina's tailwaters and freestone gradient are five fisheries, and the limits differ with them.
Open the trout map →Every trout stream near you, coloured by today's water temperature.