Used 2021 GMC Sierra 2500HD prices, November 2026
A used 2021 GMC Sierra 2500HD is listed for about $39,777–$52,416 at US dealers (middle 50% of 425 listings), with a median of $46,990 at 90,145 miles, as of Nov 7, 2026. That's 1.4% lower than on Oct 25, 2026 ($47,644).
Updated · By CarWhere Research · Source: active US dealer listings (licensed vehicle-data providers) · About this data
Median asking price
$46,990
Average $45,520
Median miles
90,145
Average 94,646
For sale now
425
15 certified (3.5%)
Median days listed
42
How much is a used 2021 GMC Sierra 2500HD?
A used 2021 GMC Sierra 2500HD has a median asking price of $46,990 (average $45,520), with the middle half of listings between $39,777 and $52,416. That's 22% below the median for all used Sierra 2500HDs ($60,211).
Are used 2021 GMC Sierra 2500HD prices going down?
Yes. The median asking price for a used 2021 GMC Sierra 2500HD moved from $47,644 on Oct 25, 2026 to $46,990 on Nov 7, 2026 (-1.4%).
Dealer asking price vs. trade-in vs. private sale
The prices on this page are what US dealers are asking for a 2021 GMC Sierra 2500HD today, before negotiation, taxes and fees. A dealer's trade-in offer for the same car is usually well below its asking price, because the dealer has to recondition it, carry it and still make a margin. A private sale typically lands between the two. To estimate your own car, try the trade-in calculator or the used car value tool.
Used 2021 GMC Sierra 2500HD listings by trim
The AT4 is the most common 2021 Sierra 2500HD on dealer lots (40% of listings). Click a count for those listings.
| Trim | For sale now | Share (%) |
|---|---|---|
| AT4 | 170 | 40% |
| SLT | 84 | 19.8% |
| SLE | 63 | 14.8% |
| Base | 57 | 13.4% |
| Denali | 51 | 12% |
Where are the most used 2021 GMC Sierra 2500HDs for sale?
Texas has the most (38 listings), followed by Florida, Georgia, Illinois. More local supply means more cars to compare and more room to negotiate.
| State | For sale now | Share of US listings (%) |
|---|---|---|
| Texas | 38 | 8.9% |
| Florida | 20 | 4.7% |
| Georgia | 20 | 4.7% |
| Illinois | 19 | 4.5% |
| Ohio | 19 | 4.5% |
| Michigan | 16 | 3.8% |
| Minnesota | 15 | 3.5% |
| Missouri | 15 | 3.5% |
| Alabama | 14 | 3.3% |
| New York | 14 | 3.3% |
Other Sierra 2500HD model years
| Model year | Median price (USD) | Median miles | For sale now |
|---|---|---|---|
| 2026 | $76,598 | 8,721 | 943 |
| 2025 | $69,727 | 24,216 | 1,808 |
| 2024 | $65,031 | 46,764 | 3,034 |
| 2023 | $52,715 | 66,540 | 543 |
| 2022 | $48,900 | 78,030 | 754 |
| 2021 | $46,990 | 90,145 | 425 |
Frequently asked questions
How much is a 2021 GMC Sierra 2500HD?
A used 2021 GMC Sierra 2500HD has a median asking price of $46,990 (average $45,520), with the middle half of listings between $39,777 and $52,416. That's 22% below the median for all used Sierra 2500HDs ($60,211). Based on 425 listings on Nov 7, 2026.
What is a 2021 GMC Sierra 2500HD worth?
At a dealer, most 2021 GMC Sierra 2500HDs are priced $39,777–$52,416; the median listing has 90,145 miles. Lower miles, a higher trim and certified pre-owned status push a car toward the top of that range. Expect a trade-in offer below the dealer asking range, and a private sale to land in between.
Are used 2021 GMC Sierra 2500HD prices going down?
Yes. The median asking price for a used 2021 GMC Sierra 2500HD moved from $47,644 on Oct 25, 2026 to $46,990 on Nov 7, 2026 (-1.4%).
How many used 2021 GMC Sierra 2500HDs are for sale?
425 were listed at US dealers on Nov 7, 2026, 15 (3.5%) certified pre-owned. The most common trim is the AT4 (170 listings).
How long does a used 2021 GMC Sierra 2500HD take to sell?
Half of the 2021 GMC Sierra 2500HDs listed today have been on the market 42 days or less.
Where are the most used 2021 GMC Sierra 2500HDs for sale?
Texas has the most (38 listings), followed by Florida, Georgia, Illinois. More local supply means more cars to compare and more room to negotiate.
About this data
- Period
- Listings active on Nov 7, 2026 (snapshot)
- Filter
- Used and certified 2021 GMC Sierra 2500HD, all US states
- Counts
- 425 listings (15 certified pre-owned)
- Method
- Median, average and 25th–75th percentile asking price, odometer miles and days listed across active used and certified pre-owned 2021 GMC Sierra 2500HD listings at US dealers. Change compares today's median with the same model year's median in our Oct 25, 2026 snapshot. Asking prices are what dealers list, not what buyers paid.
- Source
- Active used and certified listings at US dealers from licensed vehicle-data providers. Only aggregates are kept: counts, medians, averages and percentiles.
- Updates
- Refreshed from a new market snapshot on a regular schedule; last updated .
- Data
- Download JSON (the aggregates on this page)