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Rainbow trout in Minnesota

Oncorhynchus mykiss — introduced to Minnesota, holding water between 55 and 65°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.

• 55–65°FWater, preferred
• 8–16"Typical length
• IntroducedIn Minnesota
• 20Waters listed here

What it is

Salmonidae — Pacific trout, genus Oncorhynchus · Oncorhynchus mykiss

• A pink to magenta band down the lateral line, brightest on a fish in spawning condition and faint on a fresh-run lake fish.
• Heavy black spotting scattered over the back, the dorsal fin and — the mark that separates it — the whole of the tail, in rows that radiate outward.
• Silver-olive ground colour, white belly, no red spots and no vermiculations.
• Tail squared and clearly spotted.

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. Stocked widely, wild in a smaller share of the designated water than brown or brook — and on the North Shore the name covers two fisheries, because the steelhead running up out of Lake Superior are rainbow trout and are managed as their own.

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.

Minnesota's classified trout water, whole

The inventory the list above was drawn from, by the state's own class.

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

Rainbow trout hold 55–65°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: Spring — March into May — on gravel, which is what separates it from the two autumn spawners above.

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.

How to catch it

Faster, broken, oxygenated water: riffles, runs and pocket water, more often in the current than under the bank.

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 rainbow 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 rainbow trout rule dressed up as one. Snapshot taken 2026-08-17.

The full Minnesota regulation page →

Habitat notes

Faster, broken, oxygenated water: riffles, runs and pocket water, more often in the current than under the bank.

• 55–65°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 →
• Brown trout in Minnesota Salmo trutta →
• Lake trout in Minnesota Salvelinus namaycush →

Rainbow 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.

• Michigan →
• Wisconsin →
• Virginia →
• North Carolina →

Open the trout map →Every trout stream near you, coloured by today's water temperature.