At what depth should I bury fence posts?
A general rule of thumb is to place at least 18in of the post in the ground depending on local conditions and height of fence. Use a diameter of 10″-12″ for all postholes. We also suggest burying all gate posts, end posts, corner posts and posts that will be used to hold 8ft tall fencing at least 6″ deeper than the other posts, especially in areas with high wind or extreme weather.