Used 2020 GMC Sierra 1500 Double Cab prices
The average asking price for a used 2020 GMC Sierra 1500 Double Cab is $23,344, with 98,812 miles on average, across 7 cars for sale at U.S. dealers as of Nov 10, 2026.
2020 GMC Sierra 1500 Double Cab prices by state
Used 2020 GMC Sierra 1500 Double Cab prices: common questions
What is a fair price for a used 2020 GMC Sierra 1500 Double Cab?
Used 2020 GMC Sierra 1500 Double Cabs for sale at U.S. dealers ask $23,344 on average (half ask less than $24,715), across 7 cars. The cars for sale have 98,812 miles on average: one with fewer miles is worth more, and one with more is worth less. To check one car's price against cars of its trim and mileage, enter its VIN in OttoQuest's free Deal Check.
How does the 2020 GMC Sierra 1500 Double Cab compare with the 2019 and 2021?
The 2020 asks $23,344 on average with 98,812 miles; the 2019 asks $23,482 with 102,815 miles, and the 2021 asks $26,509 with 83,625 miles.
Used and certified cars for sale at US dealers, each car counted once. Days listed are the dealer’s own days on market where they publish it. Price moves compare the same cars at both ends of the window.