How Deep Should Fence Posts Be in Dallas Clay Soil?
Post depth is the #1 reason fences lean or last. Here’s the rule of thumb — and why North Texas clay makes it matter even more.
If you remember one thing about fences: a fence doesn’t fail because of the wood — it fails because of how it’s set. Post depth is where most fences are won or lost.
The rule of thumb
Set at least 1/3 of the post’s above-ground height into the ground. For a standard 6-ft fence that means a hole roughly 24–30 inches deep, in real concrete — deeper for taller fences, gate posts, and corners.
Why Dallas clay soil demands more
North Texas ‘black gumbo’ clay swells when wet and shrinks when dry, constantly working against shallow posts. That expand-and-contract cycle is exactly what tips fences over. Deeper holes, real concrete footings, and proper crowning to shed water are what keep a fence plumb through Dallas seasons.
Our standard
Estrada sets posts deeper than code minimum in real concrete on every job — not dry-packed dirt, not a shallow hole. It costs a little more up front and it’s the difference between a fence that stands straight for years and one that leans after a season.
Frequently asked questions
About 24–30 inches deep in concrete — at least a third of the post’s above-ground height. Gate and corner posts should go deeper.
In Dallas clay, yes. Real concrete footings resist the soil’s swell-and-shrink cycle far better than dirt or gravel.
Related services
Owner on every job · in-house crews · written warranty
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