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Used GMC Sierra for Sale in Thornton, CO

56 used GMC Sierra listed by 6 local dealers in Thornton, CO. Median asking price $64,527.

56vehicles
6dealerships
$15,406–$98,887price range
$64,527median price
16median miles

56 vehicles · page 1 of 2

Frequently asked questions

How many used cars are for sale in Thornton, CO (GMC Sierra)?
AutosXchange currently lists 56 vehicles in Thornton, CO (GMC Sierra) from 6 dealerships.
What is the average price of a used car in Thornton, CO (GMC Sierra)?
The median dealer-advertised price is $64,527, ranging from $15,406 to $98,887.
Are there used cars under $20,000 in Thornton, CO (GMC Sierra)?
Yes. 4 of the 56 vehicles listed in Thornton, CO (GMC Sierra) are priced under $20,000.
What are the most common makes for sale in Thornton, CO (GMC Sierra)?
The most-listed makes are GMC (56).

Dealer listings are supplied by each dealership from its own website and refreshed as inventory changes; prices are dealer-advertised asking prices, so confirm availability, fees and final price with the selling dealer. Listings marked "Private seller" are submitted by the car's owner and reviewed by AutosXchange; AutosXchange does not inspect private-party vehicles.

AutosXchange Intel

Price activity in Thornton, CO

All vehicles tracked in Thornton, CO; data as of Nov 12, 7:35 AM PST.

29.6%of 1,299 listings had a price cut in 7 daysWhat this means: About 1 in 3 of the 1,299 listings in Thornton, CO tracked had a price cut in the last 7 days.
$1,461average price cut, 7 daysWhat this means: When a price was cut here, the cut averaged $1,461.
136new listings, 7 days
101removed from sale, 7 daysWhat this means: 35 more cars were listed than removed in the last 7 days, so there are more to choose from than a week ago.

Price-cut rate (7 days): Thornton, CO 29.6% · Colorado 19.5% · the Mountain states 14.3% · the West 12.4% · United States 11%.

Market movers in Thornton, COPrice changes in Thornton, CO (AutosXchange Intel Hub)Market TrendsThornton, CO vs. national
Source: AutosXchange Intel Hub, autos-xchange.com/market. Asking prices of dealer listings tracked by AutosXchange since Nov 5, 2026, not sold prices; not seasonally adjusted. A market figure is published only with at least 30 listings from at least 5 dealers (no dealer above 40%). "Removed from sale" means a listing left the dealer's website; it is not a confirmed sale. Methodology
AutosXchange Intel

Who removed and who added cars in Thornton, CO

Last 7 days, from listing tracking of every dealer. Removed = not advertised anywhere since (not always a sale); cars moved to another dealer and bulk feed changes are not counted.

Removed the most

  1. Mike Shaw Subaru — 39 removed (2026 Subaru Outback ×6…)
  2. SKYLINE MITSUBISHI — 24 removed (2026 Mitsubishi Eclipse Cross ×3…)
  3. Larry H. Miller Chrysler Dodge Jeep Ram 104th — 14 removed (2024 Toyota RAV4…)
  4. Grand Kia — 9 removed (2027 Kia Telluride Hybrid ×2…)
  5. O'Meara GMC — 9 removed (2024 Chevrolet Silverado 1500…)
  6. Drive N-Motion Thornton — 7 removed (2022 Kia Sorento…)

All 102 cars removed in Thornton, CO, last 7 days →

Added the most

  1. Mike Shaw Subaru — 39 added (2027 Subaru Crosstrek ×19…)
  2. Drive N-Motion Thornton — 28 added (2024 Hyundai Elantra ×3…)
  3. O'Meara GMC — 6 added (2024 Ford F-150…)
  4. Grand Kia — 5 added (2024 Kia EV6…)
  5. Larry H. Miller Chrysler Dodge Jeep Ram 104th — 1 added (2026 Jeep Grand Cherokee…)

All 79 cars added in Thornton, CO, last 7 days →

Dealer activity in Thornton, CO · Heatmap