Used 2021 GMC Terrain Price in the US
A used 2021 GMC Terrain in the US typically lists for $15,875–$19,995, with a median asking price of $17,995 across 420 active US dealer listings (as of 2026-10-18). The cheapest one listed right now is $7,250, a 2021 SLT in Magnolia, TX — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.
- Typical range
- $15,875 – $19,995
- Median
- $17,995
- Cheapest 5%
- under $12,895
- Cheapest listed now
- $7,250
Browse by model year
typical price per yearCheapest 10 listed right now
ranked by price-
$8,7502021 GMC Terrain SLT186,955 mi · Anderson, IN · Ed Martin Chrysler Dodge Jeep RAMView listing →
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$10,8912021 GMC Terrain SLE121,537 mi · Fairfield, CT · Gengras Chrysler Dodge Jeep Ram FairfieldView listing → -
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$10,9952021 GMC Terrain SLT113,782 mi · Queens, NY · Ideal Automotive Sales of BaysideView 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 Terrain asks $15,875–$19,995. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.
Deals on the map
10 pinnedFAQ
How much does a used 2021 GMC Terrain cost?
A used 2021 GMC Terrain in the US typically lists for $15,875 to $19,995, with a median asking price of $17,995 across 420 active US dealer listings. Nine in ten are priced between $12,895 and $23,502 (as of 2026-10-18, source: UnderMarket Cars).
Is $18,000 a good price for a used 2021 GMC Terrain?
That sits at about the market median ($17,995) for a used 2021 GMC Terrain. Under $15,875 puts you in the cheapest quarter of active US listings and under $12,895 in the cheapest 5%; above $23,502 is the priciest 5% (as of 2026-10-18).
What is the cheapest used 2021 GMC Terrain for sale right now?
$7,250 — a 2021 GMC Terrain SLT in Magnolia, TX, $10,745 under the median (as of 2026-10-18).
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 Terrain page is regenerated from it when it is requested. The figures on this page are from 2026-10-18.
Explore more
Prices updated 2026-10-18. Data covers active dealer listings across the USA.