A corner assembly for a portable shelter is disclosed herein. The corner assembly includes a corner connecting member configured to couple a support post member to one or more roof frame members of a portable shelter; and a corner trim member configured to be coupled to the corner connecting member, the corner trim member configured to be secured to the corner connecting member by a user disposed in the interior of the portable shelter. In one or more embodiments, the corner assembly further includes a support post member, the support post member configured to support a roof frame structure of a portable shelter. The corner connecting member may include a downwardly extending flange configured to extend along an interior surface of the support post member. The corner trim member may be configured to be coupled to the downwardly extending flange of the corner connecting member.