A spring-loaded plug insert for facilitating a fitting of a canopy over a frame member of an outdoor shelter is disclosed herein. The spring-loaded plug insert includes a base member defining a cavity, the base member configured to be inserted into an opening of the frame member of the outdoor shelter; a displaceable plug member slidably received within the cavity of the base member, the displaceable plug member including an end portion for attaching to the canopy of the outdoor shelter; and a spring member configured to bias the displaceable plug member in an extended position relative to the base member. The displaceable plug member is configured to be displaced by a user to a retracted position relative to the base member in order to facilitate the fitting of the canopy over the frame member of the outdoor shelter. An outdoor shelter including the spring-loaded plug insert also is disclosed.