usps shipping cut off time is the latest time a package can be dropped off at the USPS for it to be processed and shipped on the same day. This cut-off time varies depending on the location, service level, and the type of shipment. For example, Priority Mail and Express Mail may have earlier cut-off times compared to First-Class Mail. Businesses that rely on USPS for timely deliveries need to be aware of these cut-off times to ensure that their shipments leave on time.