Setting Fence Posts in Concrete: The Simple Right Way

One of the most common small DIY cement jobs, done correctly.

Dig the right depth first

A general rule is burying about one-third of the total post length below ground — shallow holes are a common cause of leaning fences later.

Fast-setting mix simplifies the job

Fast-setting concrete mix is specifically designed for this — pour the dry mix directly around the post and add water, no separate mixing container needed.

Get the post plumb before the concrete sets

Use a level to check the post is perfectly vertical and brace it in place while the concrete firms up, which typically takes 20-40 minutes for fast-setting mix.

Slope the top for drainage

Shaping the concrete to slope slightly away from the post at the top helps water drain away rather than pooling around the wood or metal, extending the post's lifespan.

Let it cure before attaching anything heavy

While fast-setting mix firms up quickly, wait the full recommended cure time before attaching fence panels or gates that put real load on the post.