Rainbow Trout Fishing in Colorado
Oncorhynchus mykiss
Also known as: rainbow trout, steelhead, rainbow
Colorado quick take
Colorado rainbows are most stable on cold tailwaters, so let flow and seasonal runoff dictate whether you fish rivers or switch to lakes.
Max Length
120cm
Typical trophy size
Max Weight
25.4kg
Record class
Water Temp
45–64°F
Preferred range
Difficulty
2/5
Skill level
How to catch Rainbow Trout in Colorado
Colorado rainbows are most stable on cold tailwaters, so let flow and seasonal runoff dictate whether you fish rivers or switch to lakes.
Where to fish for Rainbow Trout in Colorado
Prioritize South Platte, Arkansas, and other cold-release rivers with stable year-round flows.
Use high-country lakes and reservoirs after runoff or during summer when stillwater temperatures stay favorable.
Target seams, runs, tailouts, and deep slots in rivers, or inlets and cooler depth bands in lakes.
How to work the pattern in Colorado
Fish nymphs, midges, and small streamers through controlled drifts on tailwaters and major trout rivers.
On lakes, troll or cast small spoons, jigs, or bait presentations at the exact depth where cooler water and forage overlap.
Seasonal behavior in Colorado
Tailwaters hold fish through winter and summer extremes, runoff narrows freestone options in late spring, and summer opens both clear rivers and high-elevation lakes.