The average asking price for a used 2021 GMC Sierra 1500 Crew Cab is $33,435, with 78,139 miles on average, across 91 cars for sale at U.S. dealers as of Nov 10, 2026.
Used 2021 GMC Sierra 1500 Crew Cabs for sale at U.S. dealers ask $33,435 on average (half ask less than $33,590), across 91 cars. The cars for sale have 78,139 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 13 for sale with a listing date have been listed 77 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 2021 asks $33,435 on average with 78,139 miles; the 2020 asks $32,248 with 80,828 miles, and the 2022 asks $40,549 with 67,383 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 |
