Abstract: A modular fall protection system has an adjustable frame that can be mounted onto an external structure and used to support the weight of a user who has fallen. The adjustable frame has a length-adjustable mast, set of connective braces, and an anchor point. The length-adjustable mast is a telescoping post that can be extended or collapsed to provide fall protection to the user at various heights. The connective braces extend between the length-adjustable mast and the external structure and are used to maintain the length-adjustable mast in an orientation that facilitates suspending the user in the air after a fall. The anchor point enables the user to be tethered to the length-adjustable post. Preferably, the system has a detachable walkway and handrail that can be mounted onto the adjustable frame and provide fall protection in a variety of situations.