A novel maize variety designated PH13A0 and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH13A0 with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH13A0 through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PH13A0 or a locus conversion of PH13A0 with another maize variety.