Fair pricePrice drop −$2,000
6 photos2026 GMC Sierra 2500 HD SLE
$63,727$65,727est. $1,097/mo
- 4 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Used GMC for Sale in Thornton, CO
110 used GMC vehicles listed by 7 dealerships in Thornton, CO, priced $10,900–$112,987.
110vehicles
7dealerships
$10,900–$112,987price range
$58,307median price
10median miles
110 vehicles · page 2 of 3
Price drop −$185
6 photos2026 GMC Sierra 1500 SLT
$64,527$64,712est. $1,111/mo
- 13 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Price drop −$462
6 photos2026 GMC Sierra 1500 Denali
$64,632$65,094est. $1,113/mo
- 8 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,000
6 photos2026 GMC Sierra 2500 HD SLE
$65,527$67,527est. $1,128/mo
- 4 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair priceNew listing
1 photos2026 GMC Sierra 1500 Denali
$66,254est. $1,141/mo
- 16 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$140
6 photos2026 GMC Sierra 1500 Denali
$66,932$67,072est. $1,152/mo
- 8 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair price
6 photos2026 GMC Sierra 1500 Denali
$67,352est. $1,160/mo
- 23 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
1 photosCARFAX2026 GMC Sierra 1500 Denali Ultimate
$70,219est. $1,209/mo
- 21,235 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
6 photos2026 GMC Sierra 1500 Denali
$72,275est. $1,244/mo
- 4 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
2 photos2026 GMC Sierra 1500 Denali
$72,320est. $1,245/mo
- 13 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
3 photos2026 GMC Sierra 1500 Denali
$72,320est. $1,245/mo
- 4 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Stock photo
26 photos2026 GMC Sierra 1500 Denali
$72,320est. $1,245/mo
- 4 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Stock photo
25 photos2026 GMC Sierra 1500 Denali
$72,320est. $1,245/mo
- 4 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Price drop −$2,000
6 photos2026 GMC Sierra 2500 HD SLT
$79,897$81,897est. $1,376/mo
- 4 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Price drop −$2,000
6 photos2026 GMC Sierra 2500 HD SLT
$80,047$82,047est. $1,378/mo
- 6 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,000
6 photos2026 GMC Sierra 2500 HD AT4
$83,673$85,673est. $1,441/mo
- 10 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD AT4
$85,059$87,559est. $1,465/mo
- 10 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD AT4
$85,112$87,612est. $1,465/mo
- 13 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD AT4
$85,209$87,709est. $1,467/mo
- 10 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
2026 GMC Sierra 3500 HD Denali
$88,998est. $1,532/mo
- 4,121 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Price drop −$2,000
6 photos2026 GMC Sierra 2500 HD AT4
$89,056$91,056est. $1,533/mo
- 13 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Price drop −$2,000
6 photos2026 GMC Sierra 2500 HD AT4
$89,211$91,211est. $1,536/mo
- 18 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Good dealPrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD Denali
$91,682$94,182est. $1,579/mo
- 11 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,000
6 photos2026 GMC Sierra 2500 HD Denali Ultimate
$94,289$96,289est. $1,624/mo
- 10 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD Denali Ultimate
$97,934$100,434est. $1,686/mo
- 10 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD Denali Ultimate
$98,287$100,787est. $1,692/mo
- 13 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair pricePrice drop −$2,500
6 photos2026 GMC Sierra 3500 HD Denali Ultimate
$98,887$101,387est. $1,703/mo
- 13 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
2025 GMC Sierra 1500 Pro
$40,605est. $699/mo
- 27,963 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
1 photosCARFAX2025 GMC Sierra 1500 SLT
$40,946est. $705/mo
- 41,478 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
1 photosCARFAX2025 GMC Sierra 1500 SLT
$41,180est. $709/mo
- 32,247 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
2025 GMC Sierra 1500 Pro
$41,388est. $713/mo
- 8,116 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Price drop −$231
34 photosCARFAX2025 GMC Sierra 1500
$41,517$41,748est. $715/mo
- 13,495 mi
- 4WD
- Automatic
- Gasoline
- Truck
Mike Shaw Subaru · Thornton, CO
Fair pricePrice drop −$1,991
30 photosCARFAX2025 GMC Sierra 2500 HD AT4
$65,983$67,974est. $1,136/mo
- 35,681 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair price
29 photosCARFAX2025 GMC Sierra 2500 HD AT4
$68,387est. $1,178/mo
- 32,138 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
Fair price
26 photosCARFAX2024 GMC Sierra 1500 Elevation
$41,125est. $708/mo
- 67,781 mi
- 4WD
- Automatic
- Diesel
- Truck
O'Meara GMC · Thornton, CO
2024 GMC Sierra 1500 Denali
$57,494est. $990/mo
- 14,625 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Good deal
30 photosCARFAX2024 GMC Yukon Denali
$58,307est. $1,004/mo
- 68,340 mi
- 4WD
- Automatic
- Gasoline
- SUV
O'Meara GMC · Thornton, CO
2023 GMC Acadia SLT SUV
$22,625est. $390/mo
- 81,493 mi
- AWD
- Automatic
- Gasoline
- SUV
SKYLINE MITSUBISHI · Thornton, CO
Fair price
23 photosCARFAX2023 GMC Sierra 1500 Elevation
$40,290est. $694/mo
- 41,370 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
23 photos2023 GMC Sierra 1500 AT4 Truck Crew Cab
$42,881est. $738/mo
- 71,973 mi
- 4WD
- Automatic
- Diesel
- Truck
SKYLINE MITSUBISHI · Thornton, CO
Fair price
1 photosCARFAX2023 GMC Sierra 3500 HD SLE
$46,853est. $807/mo
- 46,850 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
1 photosCARFAX2023 GMC Sierra 1500 AT4
$48,723est. $839/mo
- 55,695 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
2023 GMC Sierra 1500 Denali
$49,247est. $848/mo
- 37,463 mi
- 4WD
- Automatic
- Gasoline
- Truck
O'Meara GMC · Thornton, CO
Fair price
21 photos2022 GMC Canyon Elevation Truck Crew Cab
$25,660est. $442/mo
- 91,006 mi
- 2WD
- Automatic
- Gasoline
- Truck
SKYLINE MITSUBISHI · Thornton, CO
Fair price
22 photos2022 GMC Acadia AT4 SUV
$26,261est. $452/mo
- 49,535 mi
- AWD
- Automatic
- Gasoline
- SUV
SKYLINE MITSUBISHI · Thornton, CO
Frequently asked questions
- How many used cars are for sale in Thornton, CO (GMC)?
- AutosXchange currently lists 110 vehicles in Thornton, CO (GMC) from 7 dealerships.
- What is the average price of a used car in Thornton, CO (GMC)?
- The median dealer-advertised price is $58,307, ranging from $10,900 to $112,987.
- Are there used cars under $20,000 in Thornton, CO (GMC)?
- Yes. 5 of the 110 vehicles listed in Thornton, CO (GMC) are priced under $20,000.
- What are the most common makes for sale in Thornton, CO (GMC)?
- The most-listed makes are GMC (110).
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.