usps next day cutoff refers to the specific time by which USPS must receive a package to guarantee it will be delivered the following day. For services like Priority Mail Express, the cutoff time can vary depending on the location of the post office and the type of service selected. Customers must ensure that packages are dropped off or scheduled for pickup before the cutoff time to avoid delays and ensure next-day delivery. The cutoff time is usually in the late afternoon or early evening, but it is best to check with the local post office for accurate timing.