LA anglers eye flounder closure as fall tides build toward the weekend
Water temperatures are holding in the upper 70s across the coast this week, with the NOAA CO-OPS gauge at Southwest Pass near the Mississippi's mouth reading 79.3°F and the Grand Isle station at 78.4°F, typical warmth for mid-October in the Delta. Both stations show the tide dropping to a pre-dawn low, 6:42 a.m. CDT at Southwest Pass and 8:26 a.m. CDT at Grand Isle, a window worth working if targeting current on outgoing water. Louisiana Sportsman reports the recreational and commercial Southern Flounder season closes October 15 through November 30, so anglers chasing flatfish for the cooler have only a few days left before the closure takes effect.
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With the new moon overhead, tidal swings should strengthen into the weekend, pushing more volume through the passes and marshes on both the morning low and the following high, worth building a trip around if fishing current-dependent structure. Water temps in the high 70s should hold close to steady barring a cold front, keeping the fishery in its typical early-fall pattern for now.
The hard date to plan around is Thursday's flounder closure; anyone wanting flounder in the cooler should get out before October 15 and check state regulations for exact size and bag limits. Past that, the new-moon push into the weekend is the best window on the calendar.
Context
Mid-October puts Louisiana's Gulf Coast and Delta in the heart of the fall transition, when cooling nights typically start easing baitfish and gamefish out of the back marshes toward deeper, more stable water, though temperatures here are still running on the warm side for the date. The flounder closure tracks the species' annual offshore spawning run, a long-standing seasonal pattern on this coast rather than a new restriction. Expect the shift toward cooler-water patterns to accelerate through late October as fronts become more frequent.
Synthesized from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Check local regulations before keeping fish. Never trust a single source for a trip decision.
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