Chain link fence posts need to be buried 18-24 inches below the ground. The top of the post should be even with or just below the surface of the ground. If you are using a post driver, you will want to go down at least 2 feet for a 6x6 post. For an 8x8 post, you will want to go down 3 feet.

posts should be buried at least 18 inches below ground. This is to ensure that the fence is stable and can't be easily pulled out of the ground.