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Best winter flounder lakes in Connecticut

19 Connecticut waters list winter flounder (official records or labelled estimates), 19 mapped with survey or official-chart depth data. Ranked below by size and depth-data quality, leading with the waters in our reviewed search catalog — open any water to see exactly where to fish it: depth contours, scored spots with plain-English reasons, seasonal windows and bait picks. A cold-water inshore flatfish of Northeast harbors — spawning in protected shallows, then settling along mud, sand and channel edges.

1. Fishers Island Sound — 116 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #1: survey-backed contours receive the ranking's data-quality boost · 3 public access sites, 1 carry-in or shore-oriented
2. Captain Harbor — 41 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #2: survey-backed contours receive the ranking's data-quality boost · 1 public access site
3. Mystic Harbor — 25 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #3: survey-backed contours receive the ranking's data-quality boost · 1 public access site, 1 carry-in or shore-oriented
4. Sheffield Island Harbor — 35 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #4: survey-backed contours receive the ranking's data-quality boost · 1 public access site
5. Greenwich Cove — 20 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #5: survey-backed contours receive the ranking's data-quality boost · 1 public access site
6. Duck Island Roads — 43 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #6: survey-backed contours receive the ranking's data-quality boost · 1 public access site, 1 carry-in or shore-oriented
7. Cockenoe Harbor — 30 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #7: survey-backed contours receive the ranking's data-quality boost · 1 public access site
8. Norwalk Harbor — 25 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #8: survey-backed contours receive the ranking's data-quality boost · 1 public access site
9. Guilford Harbor — 11 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #9: survey-backed contours receive the ranking's data-quality boost · 1 public access site
10. Clinton Harbor — 14 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #10: survey-backed contours receive the ranking's data-quality boost · 1 public access site
11. Stonington Harbor — 19 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #11: survey-backed contours receive the ranking's data-quality boost · 1 public access site
12. Stamford Harbor — 26 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #12: survey-backed contours receive the ranking's data-quality boost · 1 public access site
13. New London Harbor — 88 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #13: survey-backed contours receive the ranking's data-quality boost · 2 public access sites
14. Twotree Island Channel — 85 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #14: survey-backed contours receive the ranking's data-quality boost · 1 public access site
15. Black Rock Harbor — 20 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #15: survey-backed contours receive the ranking's data-quality boost · 2 public access sites, 1 carry-in or shore-oriented
16. Milford Harbor — 19 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #16: survey-backed contours receive the ranking's data-quality boost · 2 public access sites, 1 carry-in or shore-oriented
17. Byram Harbor — 11 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #17: survey-backed contours receive the ranking's data-quality boost · 1 public access site
18. Indian Harbor — 15 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #18: survey-backed contours receive the ranking's data-quality boost · 1 public access site
19. Niantic Bay — 30 ft max · real survey depth contours · Striped Bass, Summer Flounder (Fluke), Winter Flounder, BluefishWhy #19: survey-backed contours receive the ranking's data-quality boost · 1 public access site

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When to fish winter flounder in Connecticut

• Spring 2–18 ft — Fish soft mud, sand and the shallow side of measured channel shoulders with a slow bottom presentation; the exact Setauket assessment identifies spring as the local fishery season.
• Summer 8–30 ft — Most fish favor cooler, deeper water or leave small warm embayments; treat summer marks as low-confidence holding-water searches rather than a dependable bite.
• Fall 6–25 ft — As water cools, probe mud-to-channel transitions slowly and confirm fish locally before repeating a drift.
• Winter 3–20 ft — Winter flounder use protected inshore spawning habitat; use a slow bottom rig and avoid treating a mapped zone as proof of current concentration.

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Winter Flounder elsewhere: Maine · New York · Massachusetts · Nova Scotia