The average asking price for a used 2020 GMC Sierra 1500 Crew Cab is $32,248, with 80,828 miles on average, across 75 cars for sale at U.S. dealers as of Nov 10, 2026.
Used 2020 GMC Sierra 1500 Crew Cabs for sale at U.S. dealers ask $32,248 on average (half ask less than $32,990), across 75 cars. The cars for sale have 80,828 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.
The 17 for sale with a listing date have been listed 61 days on average. A car listed much longer than that, or one whose price has already been cut, usually leaves more room to negotiate.
The 2020 asks $32,248 on average with 80,828 miles; the 2019 asks $31,213 with 89,279 miles, and the 2021 asks $33,435 with 78,139 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.
| $27,840 |
| 84,139 |
| 8 |
| 2014 | $25,223 | 86,813 | 6 |
| 2013 | $21,057 | 95,293 | 3 |
