Live US dealer listings Median-priced benchmark Updated 2026-10-17
Market price · Used 2021 GMC Sierra 3,919 listings tracked

Used 2021 GMC Sierra Price in the US

A used 2021 GMC Sierra in the US typically lists for $31,713–$41,010, with a median asking price of $35,988 across 3,919 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $14,995, a 2021 Base in San Antonio, TX — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

Used 2021 GMC Sierra · asking prices3,919 listings
$25k$57.5k
Typical range
$31,713 – $41,010
Median
$35,988
Cheapest 5%
under $25,995
Cheapest listed now
$14,995

Browse by model year

typical price per year
More years (19)

Cheapest 10 listed right now

ranked by price
  1. 2021 GMC Sierra
    $14,995
    2021 GMC Sierra Base
    138,769 mi · San Antonio, TX · GM-Z Motors
    View listing →
  2. 2021 GMC Sierra
    $15,900
    2021 GMC Sierra Fleet Base
    175,275 mi · Pomona, KS · Bailey Auto
    View listing →
  3. 2021 GMC Sierra
    $15,950
    2021 GMC Sierra SLE
    245,526 mi · Dayton, OH · Kyle’s Auto Mall
    View listing →
  4. $15,995
    2021 GMC Sierra Fleet Base
    185,716 mi · Shepherd, MI · Old 27 Sales
    View listing →
  5. 2021 GMC Sierra
    $15,999
    2021 GMC Sierra Fleet Base
    185,000 mi · Coldwater, KS · TNT Auto
    View listing →
  6. 2021 GMC Sierra
    $16,988
    2021 GMC Sierra SLE
    151,170 mi · Corpus Christi, TX · Mike Shaw Toyota
    View listing →
  7. 2021 GMC Sierra
    $16,995
    2021 GMC Sierra SLE
    163,494 mi · Poughkeepsie, NY · Mid State Auto Sales
    View listing →
  8. $17,390
    2021 GMC Sierra Fleet Base
    172,294 mi · Dunn, NC · Bleecker Chevrolet
    View listing →
  9. $17,599
    2021 GMC Sierra Fleet Base
    160,953 mi · West Milford, NJ · Ramsey Corp.
    View listing →
  10. 2021 GMC Sierra
    $17,793
    2021 GMC Sierra SLE
    140,815 mi · Larwill, IN · 24/7 Cars
    View listing →

These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2021 GMC Sierra asks $31,713–$41,010. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.

FAQ

How much does a used 2021 GMC Sierra cost?

A used 2021 GMC Sierra in the US typically lists for $31,713 to $41,010, with a median asking price of $35,988 across 3,919 active US dealer listings. Nine in ten are priced between $25,995 and $55,828 (as of 2026-10-17, source: UnderMarket Cars).

Is $36,000 a good price for a used 2021 GMC Sierra?

That sits at about the market median ($35,988) for a used 2021 GMC Sierra. Under $31,713 puts you in the cheapest quarter of active US listings and under $25,995 in the cheapest 5%; above $55,828 is the priciest 5% (as of 2026-10-17).

What is the cheapest used 2021 GMC Sierra for sale right now?

$14,995 — a 2021 GMC Sierra Base in San Antonio, TX, $20,993 under the median (as of 2026-10-17).

Are these MSRP or real asking prices?

Real asking prices from active US dealer listings, deduplicated by VIN — not manufacturer MSRP. They already reflect dealer discounts, and they exclude tax, title, registration and dealer fees.

How often are prices updated?

The listing data behind UnderMarket Cars is rebuilt from live US dealer inventory every few hours, and this used 2021 GMC Sierra page is regenerated from it when it is requested. The figures on this page are from 2026-10-17.

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Prices updated 2026-10-17. Data covers active dealer listings across the USA.