what is usps ground transportation refers to the USPS delivery service that uses surface transport—primarily trucks—to move packages across the country. When users search for this term, they are usually referring to services like USPS Ground Advantage or Retail Ground, which offer economical shipping for less urgent deliveries. USPS ground transportation is slower than Priority Mail, typically taking 2–5 business days depending on distance. It’s suitable for heavier or non-urgent packages where cost savings are more important than speed. Ground transport is also more environmentally friendly and less susceptible to flight delays. Businesses and individual shippers choose USPS ground when shipping large, heavy items like tools, books, or non-fragile household goods. Understanding the limitations—such as no guaranteed delivery window or fewer tracking updates—helps set proper customer expectations. For cost-effective, domestic shipping within the contiguous U.S., USPS ground transportation remains a dependable option, particularly for budget-conscious e-commerce operations or personal shipments.