A portable electric fence system including a fence assembly having at least one multi-post, at least one step-in post, a reel and an electric gate. The fence assembly comprises in a series, the at least one step-in post with the at least one multi-post being positioned at corner-portions of a temporary electrified perimeter fenced area. The bottom-end of the at least one multi-post and the at least one step-in post are configured to be inserted into a ground surface. Poly-wire is strung through and supported by a series of reels. The reel is battery powered and configured to reel in the poly-wire. The at least one multi-post, the at least one step-in post, the reel, and the electric gate are configured to be used in combination to define a temporary electrified perimeter fenced area for retaining livestock.