Connecticut hatch chart indentifying the major fly hatches that occur in the trout streams and river systems throughout the state. Includes fly species, recommended fly sizes and emergence date. For a more detailed list of hatches and emergence dates, review hatch charts for individual river systems.

From early spring when water temperature rise and flows are stable, through late fall as flows dissipate and water temperatures drop, Connecticut trout streams are alive with aquatic insect life and fly hatches. While annual hatches will vary by location and date, there are several major statewide hatches that all anglers should prepare for.

Most statewide hatches for a given fly species occur during the “Date” period listed below. The “Peak Months” field lists the dates when hatches are typically most abundant.

Most aquatic flies in Connecticut trout streams go through three stages: nymph (larvae), pupae/emergence, and adult. Targeting trout subsurface with a nymph imitation that “matches the hatch” the week preceding a hatch date can net some good catch rates.