The average asking price for a used 2018 GMC Sierra 2500HD is $35,648, with 125,557 miles on average, across 139 cars for sale at U.S. dealers as of Nov 10, 2026.
| State | Average asking | Average miles | For sale | Days listed |
|---|---|---|---|---|
| Texas | $32,232 | 140,033 | 12 | 39 |
| Michigan | $34,304 | 127,168 | 10 | 74 |
| North Carolina | $44,781 | 126,943 | 9 | 45 |
| Utah | $31,181 | 118,425 | 7 | 73 |
| Colorado | $33,746 | 126,410 | 7 | 107 |
| Oregon | $34,230 | 136,227 | 7 | 72 |
| Indiana | $41,694 | 111,028 | 5 | 38 |
| California | $34,901 | 125,408 | 5 | 70 |
| Idaho | $29,876 | 139,962 | 5 | 108 |
| Kentucky | $38,965 | 149,512 | 5 | 102 |
Used 2018 GMC Sierra 2500HDs for sale at U.S. dealers ask $35,648 on average (half ask less than $36,650), across 139 cars. The cars for sale have 125,557 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 129 for sale with a listing date have been listed 59 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 2018 asks $35,648 on average with 125,557 miles; the 2017 asks $34,085 with 131,098 miles, and the 2019 asks $40,962 with 115,108 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.
| $26,930 |
| 163,190 |
| 152 |
| 2014 | $23,779 | 165,285 | 39 |
| 2013 | $19,809 | 167,608 | 72 |
| 2012 | $19,066 | 148,374 | 57 |
| 2011 | $19,422 | 180,958 | 46 |
| 2010 | $14,386 | 190,922 | 9 |
| 2009 | $18,079 | 171,561 | 16 |
| 2008 | $16,401 | 183,207 | 19 |
| 2007 | $17,477 | 208,493 | 10 |
| 2006 | $22,108 | 148,787 | 12 |
| 2005 | $20,309 | 156,343 | 32 |
| 2004 | $15,568 | 188,861 | 21 |
| 2003 | $16,512 | 182,547 | 24 |
| 2002 | $13,513 | 181,155 | 9 |
| 2001 | $12,574 | 189,294 | 9 |
| 1971 | $23,945 | 47,300 | 2 |
