Fishing Grass Flats and Potholes

Part of Places to Fish · All fishing tutorials

A grass flat looks empty from the boat and reads like a map once you know the language. The dark carpet of turtle grass is the cover; the white sand holes scattered through it are the ambush points; the slightly deeper lanes cutting across it are the roads everything travels. Learn to read those three features and flats from Pine Island Sound to the Indian River Lagoon all fish the same way.

This page teaches you to read a flat from above — grass, potholes, edges, and drift lines — then how to work it by drifting or staking out, and which baits and lures account for most of the trout and redfish caught over grass.

Jump to: Reading a Grass Flat · Potholes: The Ambush Spots · Drifting and Staking Out · Baits and Lures That Work the Grass · Keep Learning

Reading a Grass Flat

Start with color. From a boat with polarized glasses, turtle grass reads as dark green to almost black bottom in two to five feet of water; sand reads pale; and the broken, mottled bottom where grass thins into patchy sand is often the best of it — enough cover to hold fish, enough openings to cast into. A flat that is one unbroken carpet with no holes, edges, or depth change is usually the least interesting water in sight.

Then find the structure inside the structure. Edges where the grass meets a sand channel or drops into a trough concentrate bait and the fish following it. Current-swept points of grass hold fish on the down-current side. Streaks of slightly deeper water — drift lines, covered below — show as darker lanes through the flat. Signs of life confirm the read: mullet schools dimpling the surface, stingrays gliding the edges, shorebirds working a shoreline, and “mullet muds,” the cloudy puffs where mullet have been rooting in the bottom, all mark a flat that is feeding somebody.

Potholes: The Ambush Spots

Potholes are the white sand craters blown into the grass, anywhere from bathtub-size to the size of a living room, and they are the single most reliable target on a grass flat. Trout and redfish hold in and around potholes because the hole gives them a clear view of shrimp, crabs, and baitfish crossing open sand against the grass edge — an ambush with a window seat. Bigger potholes and chains of connected holes hold more and bigger fish.

Fish a pothole by casting past it and working the bait or lure back across the open sand, slowly. Strikes come as the lure crosses the hole or just as it reaches the far grass edge, where the fish was actually sitting. Do not drop your first cast into the middle of the hole — a splashdown on a laid-up trout’s head ends the conversation. Work the edges first, the middle last, and give a good pothole two or three honest casts before moving on; fish holding tight to the grass do not always show themselves on the first pass.

Drifting and Staking Out

The classic way to cover a flat is the drift: set up upwind of the good bottom, kill the motor, and let the wind push you across while you cast ahead of the boat’s path. Cast down-drift and across, never behind — fish behind the boat have already heard it. A drift sock (sea anchor) hung off the stern slows you on windy days so lures stay in the strike zone longer, and a GPS track of a productive drift lets you repeat it exactly.

When a drift crosses a chain of potholes or a loaded edge, stop and fish it properly: stake out with a push pole or shallow-water anchor, work the area in a fan, then pull up and continue. Flats reward this rhythm — drift to find them, stake to catch them. On foot, the same water fishes even more quietly; our page on wade fishing Florida’s flats covers approaching these same potholes on foot, where the biggest trout on the flat are often within range of a careful wader.

Baits and Lures That Work the Grass

The most productive rig over grass, decade after decade, is a live shrimp under a popping cork — the cork’s chug calls fish in and the shrimp dangles above the grass where hooks stay clean; our popping cork rig page builds and fishes it step by step. Free-lined live shrimp and small pilchards cast to pothole edges are the quiet alternative when fish are spooky.

Artificials cover water faster. A soft-plastic jerkbait or paddletail on a light jig head (or rigged weedless for the thick grass) is the search bait; slow it down and hop it through potholes. A gold spoon wobbling over the grass is the classic redfish finder, visible from the poling platform and deadly on the flats edges. Early and late, a small topwater walked over the potholes draws the day’s most violent trout strikes. Match the weight to the depth: over grass in three feet of water, heavy jig heads bury in the grass on every cast, while 1/16- to 1/8-ounce heads swim above it.

Keep Learning

The fish of the grass flats get their own full treatments in the spotted seatrout guide and the redfish guide — seasons, baits, and the rules that go with each. The popping cork rig is the rig to master first over grass, and if you would rather stand in the water than over it, wade fishing Florida’s flats walks the same potholes at boot level. Read the grass right and the flat stops being scenery.