2021 Peterbilt 579 ISX — Used Market Prices & Trends

The 2021 Peterbilt 579 powered by the ISX is currently represented by 9 active listings on TruckRadar, with a median asking price of $49,999 and median odometer reading of 552,273 miles. Over the past 90 days, asking prices have moved down 10.1%. Seasonal softening in the used truck market tends to occur as fleets delay purchasing decisions during slower freight periods. Most units listed are configured as conventional cab with tandem rear axle (6x4) drivetrains. Geographically, the largest concentrations of 2021 579 inventory sit in Texas, Iowa, and Nebraska, where regional pricing ranges from $49,500 to $59,900. Common transmission pairings include 12 Spd Aut and 12 AUTO. The 2021 579 typically appears in dealer inventory for an average of 30 to 60 days before sale, based on TruckRadar listing turnover data. Buyers comparing this configuration often also evaluate the 567 and 389. Pricing reflects active asking prices from verified dealers and is not a substitute for a formal appraisal.

2021 Peterbilt 579 ISX — Frequently Asked Questions