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Brown trout in Minnesota
Salmo trutta — introduced to Minnesota, holding water between 54 and 66°F. Minnesota publishes no per-species records, so the 20 waters below are this site's selection from the state's own designated trout water.
Brown trout were introduced to Minnesota and the south-east Driftless is now managed around them: they reproduce without help across most of that footprint, which is why the largest single special regulation MN DNR publishes is catch-and-release for brown trout there. Eight to sixteen inches is the ordinary size, in 54 to 66°F water, with 75 the upper limit — a wider band than the brook trout above them holds, which is why browns have the bigger, slightly warmer water and the brook trout have the headwaters.
They want undercut banks, logjams and deep shaded bends, and they are the most nocturnal of the five fish on this site. Spawning runs late October into December, on gravel riffles.
Minnesota names no species on its trout water. Chapter 6264 is a designation statute, so the twenty waters listed here are designated water in a brown trout's size band and not a record of the fish.
- 54–66°FWater, preferred
- 8–16"Typical length
- IntroducedIn Minnesota
- 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 Minnesota 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, and now the fish most of the Driftless spring creeks in the south-east are managed for — reproducing without help across most of that footprint, which is why MN DNR's largest single special regulation is catch-and-release for brown trout there.
Where to find it in Minnesota
Minnesota does not publish which species each segment holds. What MN DNR publishes is not a survey and not a habitat class at all — it is a law. Minnesota Rules Chapter 6264 designates trout water and the tributaries that feed it, for watershed and timber-harvest planning as much as for fishing. 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 designated water, filtered to the drainage size this species occupies and ranked with the designated stream ahead of the protected tributary. Treat it as where to start looking.
| Water | Watershed | Classified miles | Class |
|---|---|---|---|
| South Branch Root River | Root River (Driftless) | 38.8 | Designated trout stream — Chapter 6264 |
| Nemadji River | Beartrap and Nemadji | 36.3 | Designated trout stream — Chapter 6264 |
| Little Isabella River | Rainy Headwaters (Boundary Waters) | 34.4 | Designated trout stream — Chapter 6264 |
| Straight River | Crow Wing River | 31.8 | Designated trout stream — Chapter 6264 |
| Ash River | Rainy Headwaters (Boundary Waters) | 30.1 | Designated trout stream — Chapter 6264 |
| Dinner Creek | Big Fork and Lower Rainy | 29.0 | Designated trout stream — Chapter 6264 |
| Blackhoof River | Beartrap and Nemadji | 26.5 | Designated trout stream — Chapter 6264 |
| North Fork Whitewater River | Whitewater and Buffalo (Driftless) | 26.3 | Designated trout stream — Chapter 6264 |
| Knife River | Beaver and Lester (North Shore) | 26.2 | Designated trout stream — Chapter 6264 |
| Beaver River | Beaver and Lester (North Shore) | 26.0 | Designated trout stream — Chapter 6264 |
| Rush Creek | Root River (Driftless) | 26.0 | Designated trout stream — Chapter 6264 |
| Temperance River | Baptism and Brule (North Shore) | 25.9 | Designated trout stream — Chapter 6264 |
| Little Rock Creek | Platte and Spunk | 25.0 | Designated trout stream — Chapter 6264 |
| Arrowhead Creek | Rainy Headwaters (Boundary Waters) | 24.9 | Designated trout stream — Chapter 6264 |
| Manitou River | Baptism and Brule (North Shore) | 24.7 | Designated trout stream — Chapter 6264 |
| East Branch Beaver River | Beaver and Lester (North Shore) | 23.5 | Designated trout stream — Chapter 6264 |
| Vermillion River | Rush and Vermillion (Driftless) | 23.2 | Designated trout stream — Chapter 6264 |
| Stony Brook | Crow Wing River | 23.0 | Designated trout stream — Chapter 6264 |
| Gooseberry River | Beaver and Lester (North Shore) | 22.9 | Designated trout stream — Chapter 6264 |
| Poplar River | Baptism and Brule (North Shore) | 21.6 | Designated trout stream — Chapter 6264 |
Minnesota's classified trout water, whole
The inventory the list above was drawn from, by the state's own class.
| Class | Named waters | Miles |
|---|---|---|
| Designated trout stream — Chapter 6264 | 463 | 3371 |
| Protected tributary — Chapter 6264 | 23 | 25 |
Where that is on the map
Every subwatershed this site covers in Minnesota 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 Minnesota, 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 | Little Black Stonefly, Midge |
| February | Little Black Stonefly, Midge |
| March | Blue-Winged Olive, Little Black Stonefly, Midge |
| April | Blue-Winged Olive, Hendrickson, Little Black Stonefly, Little Brown Stonefly, Little Sister Caddis, Midge |
| May | Blue-Winged Olive, Giant Black Stonefly (Salmonfly), Grannom, Little Black Caddis, Little Brown Stonefly, Little Sister Caddis and 3 more |
| June | Blue Quill, Brown Drake, Cranefly, Golden Stonefly, Grannom, Light Cahill and 8 more |
| July | Cranefly, Cricket, Golden Drake, Golden Stonefly, Grasshopper, Little Sister Caddis and 5 more |
| August | Cricket, Grasshopper, Midge, Trico, White Miller |
| September | Blue-Winged Olive, Cricket, Grasshopper, Midge, Trico |
| October | Blue-Winged Olive, Midge |
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 Minnesota's own regions and filtered to the kinds worth putting in front of this fish. Each one has its tying recipe.
- Pheasant Tail Nymph nymph · #12–22 — Blue Quill, Blue-Winged Olive, Hendrickson
- Elk Hair Caddis dry fly · #12–20 — Grannom, Little Black Caddis, Little Black Stonefly
- Hare's Ear Nymph nymph · #10–18 — Golden Drake, Grannom, Hendrickson
- Parachute Adams dry fly · #12–20 — Blue Quill, Brown Drake, Blue-Winged Olive
- CDC Caddis dry fly · #14–20 — Grannom, Little Black Caddis, Little Sister Caddis
- LaFontaine Sparkle Pupa emerger · #12–18 — Grannom, Little Sister Caddis, Spotted / Tan Caddis
- RS2 emerger · #16–24 — Blue Quill, Blue-Winged Olive, Midge
- Zebra Midge nymph · #18–24 — Blue-Winged Olive, Midge, Little Black Caddis
- Black Stonefly Nymph nymph · #12–18 — Giant Black Stonefly (Salmonfly), Little Black Stonefly, Little Brown Stonefly
- Chubby Chernobyl dry fly · #8–14 — Giant Black Stonefly (Salmonfly), Golden Stonefly, Grasshopper
- Griffith's Gnat dry fly · #18–24 — Midge, Little Black Stonefly, Trico
- Partridge & Orange Soft Hackle wet fly · #12–18 — Little Black Caddis, Little Sister Caddis, Spotted / Tan Caddis
Rules for brown trout in Minnesota
Minnesota 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 2026-08-17.
| Class | Bag | Season | Waters |
|---|---|---|---|
| designated trout stream | — | — | 415 |
| designated trout stream tributary | — | — | 98 |
The full Minnesota 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 Minnesota
- Brook trout in Minnesota Salvelinus fontinalis
- Rainbow trout in Minnesota Oncorhynchus mykiss
- Lake trout in Minnesota 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.