What does a cold front do to trout?

Less than it does to bass — and most of the damage is the sky, not the pressure. Trout are cold-water fish, so the temperature drop behind a front does not chill them into a sulk the way it does a shallow largemouth; in midsummer a cool snap can even revive a warm stream. What hurts is the cloudless, windless high that follows: bright light in clear water pushes rainbows and brook trout into shade, depth and broken water, and gives them every chance to inspect your offering. Fish it as a bright-day problem — longer, thinner leaders, smaller flies and lures, shaded banks and riffles, and the dawn and dusk hours. Lake trout at 20–30 m (66–98 ft) in summer barely notice; stay on the bait and the temperature band.

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