What changes for walleye when the water starts cooling in early fall?
Cooling water unwinds the summer dispersal. As surface temperatures fall back through the high-teens °C (mid-60s °F), the thermocline's grip loosens, scattered fish pull off the flats and weed edges, and walleye begin regrouping on steeper, harder structure — the sharp breaks, rock points, and reef edges on the routes toward wintering basins. Feeding windows widen noticeably: shortening days and dimmer light let walleye hunt further into the daytime, and the fish are visibly putting on weight for winter. It is a fluid, improving period rather than a pattern — the reliable play is checking the steep side of known summer structure a contour deeper than before, and staying mobile until you find the regrouped schools.
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