Abstract: A ground stabilization apparatus and method for using the same in the installation of an elongated post such as a fence post, mailbox post, or sign post. The ground stabilization apparatus has a central ground support collar to which a plurality of radially extending stabilization arms are attached. By changing the position of the stabilization arm when it is inserted into the central ground support collar, a variety of post sizes and shapes can be installed using the apparatus. The ground stabilization apparatus is used to maintain the post in its upright and plumb position over time by distributing the force action on the post to a large area surrounding the post near the surface of the ground. The method of using the ground stabilization apparatus describes installing the device in a shallow channel that surrounds the post hole into which the post is to be placed.