The average pickup truck bed ranges from 5 to 6.5 feet for a short bed, and from 7 to 8 feet for a long bed, according to AutoTrader.com. Truck bed lengths vary depending on cab size, manufacturer and model.
For a compact or mid-size truck, the average length of a short bed is 5 to 6 feet, says AutoTrader.com. For a full-size truck, the typical short bed is approximately 6.5 feet.
Long beds are at least 7 feet in length, even in smaller truck models, according to AutoTrader.com. For full-size trucks, a long bed of 8 feet is more common.