Rainbow Trout
Oncorhynchus mykiss
Record Weight
48 lbs 0 oz
Lake Diefenbaker, Saskatchewan, Canada
Average Size
0.5-3 lbs
Preferred Temp
50°-65°F
Lifespan
3-11 years
Fight Rating
4/5
Taste Rating
5/5
Identification
Rainbow trout are among the most beautiful freshwater fish. They have a silvery body with a distinctive pink to red lateral band running from gill to tail, which is most vivid in wild and spawning fish. The back is olive to blue-green with black spots scattered across the back, dorsal fin, and tail. The belly is white to silver. Stocked (hatchery) rainbows tend to be paler with a less vivid stripe and often have worn or shortened fins. Rainbow trout are distinguished from brown trout by their pink lateral stripe (brown trout have red spots with pale halos) and from brook trout by the lack of worm-like markings (vermiculations) on the back.
Habitat & Behavior
Rainbow trout require cold, clean, well-oxygenated water and are found in streams, rivers, lakes, and tailrace fisheries where water temperatures remain below 70F. They are native to western drainages but have been stocked extensively in cold-water habitats nationwide. Ideal habitat includes clear streams with riffle-pool sequences, gravel substrate for spawning, and abundant aquatic insects. In the eastern US, they are most common in mountain streams, spring-fed creeks, and dam tailraces where cold water releases maintain suitable temperatures year-round.
Rainbow trout are active, aggressive feeders that hold in current, feeding on drifting insects and baitfish. In streams, they establish feeding lanes in current seams, behind rocks, and at the heads and tails of pools. They rise to the surface to eat insects off the surface film, making them ideal targets for dry fly fishing. Rainbow trout are spring spawners (unlike brown trout which spawn in fall), requiring gravel substrate with upwelling groundwater. They are known for acrobatic leaps and sustained runs when hooked.
Best Techniques
Show setup details
Trolling too fast — use GPS speed (not speedometer) and slow down 0.2 mph at a time until you find the bite.
Best Baits & Lures
- PowerBait (chartreuse/rainbow)
- Live nightcrawlers
- Salmon eggs
- Rooster tail spinner (1/8 oz)
- Pheasant Tail nymph (fly)
- Elk Hair Caddis (fly)
- Woolly Bugger (olive/black)
- Kastmaster spoon (gold/silver)
- Corn (where legal)
- Small Panther Martin spinner
Recommended Gear
Seasonal Patterns
SpringSpring Fishing
Spring is a prime season for rainbow trout. Wild fish spawn from February through May depending on latitude, and post-spawn fish feed aggressively to recover body condition. Spring insect hatches including blue-winged olives, hendricksons, and caddisflies produce excellent dry fly fishing. Stocking programs in many states release large numbers of trout in spring, providing easy action in put-and-take fisheries. Water levels are often higher with snowmelt runoff.
SummerSummer Fishing
Summer trout fishing requires focusing on the coolest water available. Early morning fishing is most productive as water temperatures are lowest. In tailrace fisheries, generation schedules provide cold water all summer. High-elevation mountain streams and spring creeks remain productive through summer. Terrestrial patterns like ants, beetles, and grasshoppers become important fly selections. In lakes, trout go deep, and trolling or fishing near cold-water inflows is most effective.
FallFall Fishing
Fall is often the best season for large rainbow trout. Cooling water temperatures bring fish back to peak activity. Fall insect hatches including blue-winged olives and October caddis produce excellent dry fly fishing. Rainbows feed aggressively to build fat reserves before winter. Streamers imitating minnows and sculpin are highly effective for targeting large fish. Many states conduct fall stocking programs as well.
WinterWinter Fishing
Winter rainbow trout fishing can be surprisingly productive. Trout remain active in cold water and continue feeding, though at a slower pace. Small nymphs like midges and blue-winged olives are the primary food sources. Fish move to slower, deeper pools to conserve energy. Winter tailrace fisheries can be outstanding because water temperatures remain stable. In northern states with ice, rainbow trout are a popular ice-fishing target on stocked lakes.
State Records
Tips & Fun Facts
- Rainbow trout and steelhead are the exact same species (Oncorhynchus mykiss). Steelhead are simply rainbow trout that migrate to the ocean or Great Lakes before returning to rivers to spawn.
- Rainbow trout have been successfully introduced to every continent except Antarctica, making them one of the most widely distributed fish species on Earth.
- Trout can see into the ultraviolet spectrum, which helps them detect the UV-reflective bodies of aquatic insects drifting in the current.
- The global trout farming industry produces over 800,000 metric tons of rainbow trout annually, making it one of the most important aquaculture species in the world.
- In the wild, rainbow trout can jump obstacles up to 6 feet high during upstream spawning migrations, rivaling salmon in their athletic ability.