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Ideally, when you replace a fence post, you should also replace the concrete footing. The concrete bonds to your new post, creating a secure base. If you install a new post into old concrete, it won’t be as sturdy.

That said, it is possible. Sometimes the post will lift right out of the concrete. If not, you can use a high-lift car jack to try and lift the pole out of the footing. Put the new post into the same hole and backfill it with fast-setting concrete. Keep in mind, this won’t work well for metal posts.

Posts for a horizontal fence should be no more than 6 feet apart. Wood pickets are not as strong when mounted horizontally as when mounted vertically. As such, the fence panels on a horizontal fence can’t cover the same span between posts as a vertical fence can. If you install the posts further apart on a horizontal fence, the fence will lose stability, making the boards more likely to sag. 

Pickets should sit at least 2 inches off the ground to encourage groundwater to flow underneath. Pickets can sit as much as 6 inches off the ground, but setting it any higher could let pets in or out of your yard unintentionally. These are not to be confused with the fence posts anchored underground with soil or concrete footing.

You have several options for anchoring a temporary fence to keep it from falling down. Sandbags can be used as a standard weight, but they may blow away or fail in strong winds and inclement weather. Spikes and bolts are a cost-effective and easy-to-install alternative, but drilling can be difficult if the ground is frozen, too soft, or too hard. Another option is wind braces, which should be bolted into the ground to withstand turbulent wind; however, like spikes, they can be challenging to install in very soft or hard ground.