How to Fix a Sagging Fence Gate That Drags and Won't Latch

Diagnose and fix a sagging fence gate with hinge adjustment, anti-sag cable kits, and diagonal bracing — most repairs cost under $30 and take under an hour.

A wooden fence gate that used to swing clean now scrapes the ground, hangs crooked, and only latches if you lift it into place. It’s one of the most common fence problems in America, and it’s almost never a reason to buy a new gate. A gate sags because its rectangular frame is racking — the top latch corner slowly dropping away from the hinges under gravity and weather. The fix is to square the frame back up and add something that keeps it there. Most repairs take under an hour and cost less than $35.

Why Gates Sag in the First Place

A gate frame is a rectangle hung by two hinges on one side. Wood is heavy — a solid 4-foot cedar gate can weigh 40 pounds or more — and a rectangle with no diagonal support can shear into a parallelogram over time. Every gust that pushes the gate, every kid who swings on it, and every wet/dry cycle that swells and shrinks the wood nudges the frame a fraction of an inch.

Two things usually combine to make it visible:

1. The frame has racked. The latch-side top corner sits lower than it should relative to the hinge side.
2. The hinges have loosened or pulled. Screws work out of the post, or a cheap hinge bends under load.

Before you buy anything, figure out which one you’re dealing with — or both.

Step 1: Diagnose Where the Movement Is

Stand back and look at the gate closed. Then grab the latch side and try to lift and lower it.

• Gap changes at the latch. If the gap between gate and post is wide at the top and pinched at the bottom, the frame itself has racked. That’s the classic parallelogram.
• Gate pivots but the whole thing sits low on the hinge side. Look at the hinge screws. If you can see daylight between the hinge leaf and the post, or the screws spin, the problem is anchoring, not the frame.
• Latch doesn’t line up even when you lift the gate square. The latch hardware may have shifted too, but usually realigning the gate brings it back.

Push a level against the top rail of the gate. A quarter to half inch out of level is enough to drag on the ground or miss the latch on a typical 4-foot gate.

Step 2: Tighten or Replace the Hinge Screws

Start here even if you think it’s a frame problem — loose hinges masquerade as sag.

1. Tighten every hinge screw with a drill or hand screwdriver. If any spin freely, they’ve stripped the wood in the post (see Step 3).
2. Check the hinge pins. On surface-mount T-hinges, a worn or bent pin lets the gate droop even with tight screws. Replacement pins and hinge sets are a few dollars.
3. If the gate sits low only on the hinge side, loosen the hinge screws slightly, have a helper raise the gate to level, and retighten. On adjustable hinges, there’s a set screw or cam that raises and lowers the gate — use it.

Step 3: Fix Stripped Screw Holes in the Post

This is the same trick that fixes loose hinges and handrail brackets everywhere in a house:

1. Remove the stripped screw.
2. Squeeze wood glue into the hole and pack it with two or three wooden toothpicks or a golf tee.
3. Snap them flush, wait 20 minutes, then drive a longer, thicker screw — 3-inch exterior-grade, not the short screw that came with the hinge.

For badly enlarged holes, drill out to 3/8 inch, glue in a hardwood dowel, and screw into that. Stainless or coated exterior screws only — interior screws rust through within a season or two outdoors.

Step 4: Install Anti-Sag Hardware (The Real Fix)

Tightening hinges squares the gate today. The anti-sag cable keeps it square for years. You need a fence gate anti-sag kit — about $12–$25 at any hardware store. It contains a steel cable, two corner brackets, and a turnbuckle.

1. Mount one corner bracket at the bottom corner on the latch side of the gate.
2. Mount the other bracket at the top corner on the hinge side — so the cable runs diagonally under the gate from low-latch to high-hinge.
3. Hook the cable to both brackets and thread it through the turnbuckle.
4. With a helper lifting the latch corner to level, tighten the turnbuckle with a wrench until the gate sits square and the cable is taut.

Why this direction? The cable acts like a diagonal brace in tension. When the latch corner tries to drop, it pulls the cable tight instead — the turnbuckle converts the sag into cable tension. Get the direction wrong and you accelerate the sag instead of stopping it.

A few gates already have a wooden diagonal brace inside the frame. If the gate sags anyway, that brace is either running the wrong direction (it should run from the bottom hinge corner up to the top latch corner — compression brace) or its joints have loosened. The cable kit fixes both cases without rebuilding the frame.

Step 5: Realign the Latch

With the gate square, test the latch through its full swing. Most misalignment disappears on its own. If it doesn’t:

• Two-sided latch plates: loosen the mounting screws, shift to align, retighten.
• Gravity or spring latches on the post: the strike plate can usually move up/down in slotted holes. Center it on the gate’s natural resting position.
• Gate drags only at the very end of the swing: the bottom hinge is often set slightly proud of the top. Shim or adjust until the gate hangs plumb, not just level in the closed position.

Common Mistakes That Bring the Sag Back

• Running the anti-sag cable the wrong direction. High-latch to low-hinge pulls the gate down faster. Low-latch to high-hinge, always.
• Replacing the gate instead of squaring it. A brand-new gate on the same post with the same hinge screws sags again within a year.
• Using drywall screws anywhere on the project. They’re brittle and rust fast outside. Exterior-rated structural screws only.
• Overtightening the turnbuckle. You’re squaring the frame, not racking it backward. A cable that’s piano-wire tight warps the frame the opposite way.
• Ignoring an out-of-plumb post. If the post itself leans because frost heave or erosion moved it, hardware fixes only mask it. Re-set the post if it’s out of plumb by more than an inch or two.

When to Call a Pro

• The hinge post is rotted at ground level or wobbles in the soil — the post needs re-setting, which is a concrete job, not a hardware job.
• The gate frame joints themselves are split or rotted through — the frame needs rebuilding, and at that point a new pre-hung gate is often cheaper than the labor.
• A masonry or stone pillar is the hinge surface — anchoring into masonry needs sleeve anchors and experience.
• It’s a driveway gate with an automatic opener — misalignment there can damage the operator arm; the opener needs to be disconnected and adjusted correctly.

A fence contractor typically charges $150–$400 for a gate rehang; the DIY parts bill is under $35. The only expensive version of this job is the one you redo every spring.

Search intent clusters around “sagging fence gate fix,” “gate drags on ground,” “fence gate won’t latch,” “anti-sag gate kit installation,” and “gate turnbuckle cable direction.” Lead with the diagnosis (frame rack vs. hinge failure), the correct diagonal direction for the anti-sag cable, and the stripped-screw toothpick repair; secondary content should cover post rot and latch realignment.

Typical homeowner queries: “my wood gate sags and won’t close,” “which way does the anti-sag cable go on a gate,” “fence gate hinge screws keep pulling out,” “gate only latches if I lift it,” and “how do I stop my fence gate from dragging.”

Bottom Line

A sagging gate is a geometry problem: a heavy rectangle that’s lost its diagonal. Tighten the hinges into solid wood, square the frame, and lock it square with an anti-sag cable running from the bottom latch corner to the top hinge corner. An hour of work and a $20 kit turns a two-handed, lift-and-shove gate back into a one-finger swing.