The "Flounder Run" is one of the most anticipated events on the Texas coast. Every year, as the water temperature drops below 70 degrees, Southern Flounder begin their mass migration from the shallow bay nurseries to the deep Gulf of America to spawn. This migration creates a "bottleneck" effect at our coastal passes, providing anglers with a unique opportunity to target these elusive fish in high concentrations. As a scientist, I see this as a miracle of timing; as an angler, I see it as the best time to fill the freezer.
The Temperature Trigger
Flounder are highly sensitive to thermal shifts. The migration doesn't happen on a specific date; it happens on a specific temperature gradient. When that first real cold front of November hits, the shallow bay water cools rapidly. This sends a signal to the flounder that it’s time to move. They utilize the "falling" tides to push themselves toward the passes. If the 3rdcoast-reeltime dashboard shows a 10-degree drop in air temperature followed by a strong outgoing tide, the run is officially on.
Locating the "Pinch Points"
To catch migrating flounder, you have to think like a commuter in traffic. They are moving toward the passes (like Port Aransas or San Luis Pass). They don't swim in the middle of the deep channel; they hug the shorelines and the "drop-offs" along the edges. They look for "resting spots"—areas of slack water behind a jetty rock or a point of land—where they can ambush bait while waiting for the next tide to carry them further.
Tactical Lure Presentation
Flounder are ambush predators. They lie flat on the bottom, perfectly camouflaged. Your lure must stay within 6 inches of the bottom at all times. If you're not feeling the "thump" of your jig head hitting the sand, you're not in the strike zone.
- The "Flounder Pounder": Use a 1/4oz jig head with a 3-inch white or chartreuse Gulp! Mullet. The scent is vital because flounder often "taste" the bait before they commit to the strike.
- The Drag-and-Stop: Instead of hopping the lure like you would for Trout, slowly "drag" it along the bottom. Stop for 3-5 seconds every few feet. Flounder will often follow a lure and strike the moment it stops moving.
- The Wait: When you feel a "tick" or a sudden heaviness, count to five. Flounder have a tendency to "mouth" the bait before swallowing it. Setting the hook too early will pull the lure right out of their mouth.
Conservation and the "November Closure"
Because the migration is such a concentrated event, flounder are incredibly vulnerable to overfishing. To protect the spawning population, TPWD often implements a "zero harvest" closure during the peak of the run (typically November 1st to December 15th). During this time, you can still catch and release, but you cannot keep any flounder. This ensures that enough fish reach the Gulf of America to produce the next generation. Always check the current regulations on the 3rdcoast-reeltime dashboard before you head out. A sustainable fishery is everyone's responsibility.