A utility bed includes a bed frame, a bed floor, a sidewall, and a locking mechanism. The bed floor is pivotally coupled with the bed frame and is pivotable between an upright position and a cargo support position. The sidewall comprises a door portion and a wall portion. The door portion is pivotally coupled with the bed floor and pivotable between a closed position and an opened position. The locking mechanism is associated with the sidewall. The locking mechanism is configured to retain the bed floor in the upright position with the door portion of the sidewall in the opened position. Vehicles including a utility bed are also provided.