FIG. 1 is a perspective view of a base for fence post of my new design;

FIG. 2 is a side elevational view of a base for fence post thereof;

FIG. 3 is top plan view of a base for fence post thereof; and,

FIG. 4 is bottom plan view of base for fence post thereof.

The fence post is shown in broken lines for illustrative purposes only and form no part of the claimed design.