How Deep Should Fence Posts Be? A Sacramento Homeowner’s Guide

If a fence fails early, it almost never fails at the pickets. It fails underground, at the posts — the part nobody sees once the job is done. Leaning fences, wobbly gates, and posts that rot at the base all trace back to the same question: how deep were the posts set, and how?

Here is how a fence post should be installed in the Sacramento area — and what to ask any contractor before they start digging.

The short answer: 2 to 3 feet deep

For a standard 6-foot residential fence, posts should be set 2 to 3 feet deep in the ground, in concrete. Shallower than that, a post does not have enough grip in the soil to stand up to wind load, heavy gates, and years of Sacramento’s wet winters and bone-dry summers swelling and shrinking the ground around it.

Depth alone is not enough, though. Three more things decide whether a post lasts 25 years or 5:

1. Concrete — a real footing, not dirt packed back in

Every post should be set in concrete, with the hole dug to full depth first. Dirt backfilled around a post loosens over time and holds moisture against the wood. A concrete footing locks the post in position and sheds the stress of wind and gate weight into the ground.

2. Waterproof wrap below ground

The most vulnerable part of a wood post is the section right at and below ground level, where moisture sits. We wrap every post in a waterproof membrane before it goes in the hole, so ground moisture never soaks into the wood. It is a small, invisible step — and it is the difference between a post that rots in a few years and one that outlasts the fence around it.

3. The right materials above ground

• Pressure-treated posts and rails — treated lumber where structure and ground contact demand it.
• Redwood pickets — the best-looking, longest-lasting picket choice for our climate.
• Simpson steel connectors and screws — never nails. Nails work loose as wood expands and contracts; screwed steel brackets hold the frame tight for decades.

Signs your existing fence posts are failing

• The fence leans, waves, or moves when you push on it
• Gates sag, drag, or no longer latch
• Posts feel soft or crumbly at the base
• Gaps open between rails and posts

If the pickets still look decent but the posts are going, the fence is telling you it was built shallow. Rebuilding it right — posts 2 to 3 feet deep, in concrete, wrapped — is usually a better investment than patching it every year.

Frequently asked questions

Q: How deep should posts be for a 7-foot fence or a heavy gate?

A: Deeper — toward the 3-foot end of the range, with a wider concrete footing. Height and gate weight multiply the load on the post.

Q: Can a leaning fence be repaired, or does it need rebuilding?

A: If one or two posts have failed and the rest are sound, a targeted repair can work. If the posts were all set shallow, they will fail in sequence — rebuilding is the honest recommendation.

Q: Do you warranty your fences?

A: Yes — every fence we build carries a 24-month workmanship warranty, and gates carry a 12-month workmanship warranty, for projects contracted from November 4, 2026.

Get a fence that is built to stay

American Gardens Landscaping builds custom wood and metal fences across Sacramento, Fair Oaks, Citrus Heights, Roseville, Folsom, and the surrounding area. Call (916) 579-3063 for a free estimate.

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