A fence system with a gate assembly mounted in a gap between first and second fence portions of the fence system. The gate assembly can be mounted directly to a post of the first or second fence portions without being mounted to pickets or backer rails of the fence portions. A hinge may be used to mount the gate assembly, where the hinge has a clamp fixed to a support which is fixed to a first member of the hinge. A second member of the hinge can be mounted to the gate assembly with the first and second members being rotatably fixed together, thereby allowing rotation of the gate assembly between open, closed, and various other positions.