What light conditions are best for trout fishing?
Low light, almost universally. Trout eyes lack eyelids and adjustable pupils, so bright midday sun in clear water pushes rainbows and brook trout into shade, depth, or broken "riffle-roof" water, and makes them maximally able to inspect your offering; dawn, dusk, and overcast days flatten that disadvantage and bring big fish into the open. The exception is the lake trout, which already lives at depths of 20–30 m (66–98 ft) in summer where surface light barely matters — laker fishing runs on depth and bait location, not sky. In midsummer heat the low-light rule doubles, because dawn is also the coolest, best-oxygenated hour.
The full story
This answer is one piece of a longer lesson — setups, diagrams and the reasoning behind it.
More questions about Vision
- Why do trout refuse my fly or lure even when they are clearly feeding?
- Does tippet or leader diameter really matter, or is that fly-shop mythology?
- Can trout on a stream actually see me standing on the bank?
- Do UV finishes and bright colors actually catch more trout?
- Do trout see blue, green and yellow? How is their colour vision different from a bass's?
- Does a bright moon help or hurt trout fishing?
Same topic, other species
- How should I pick jig colors for crappie? — Crappie
- Can largemouth see at night? Is night fishing actually worth it? — Largemouth Bass
- How should I pick colors for big muskie baits? — Muskellunge (Muskie)
- Do cloudy days help or hurt the perch bite? — Yellow Perch
- Why do pike so often hit a lure from below and behind? — Northern Pike
- Can smallmouth see my boat? Does boat noise matter? — Smallmouth Bass
- Why does wind chop turn the walleye bite on? — Walleye