Set Fence Posts in Concrete or Gravel | Tractor Supply Co.
Setting Fence Posts in Concrete. Set fence posts in fastsetting concrete if you're planning to leave the fence in place for a long time or if you have very loose, sandy soil. First dig the holes using an auger or a posthole digger. Plan to set at least onefourth to onethird of the fence post underground, and dig the hole accordingly.