Used GMC Sierra 1500 AT4 for Sale nearFort Collins, CO
355 vehicles found
Shop with transparent pricing.
Only show listings that include dealer fees- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 37,234
- Stock #:
- L437700A
- VIN:
- 3GTUUEELXRG437700
Sponsored by Mike Maroone Chevrolet Buick GMC Longmont
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
37,234 mi
Longmont, CO
29 mi away
Good Deal
$51,582
- Year:
- 2026
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Black
- Combined gas mileage:
- 15 MPG
- Fuel type:
- Gasoline
- Interior color:
- Black
- Transmission:
- Automatic
- Mileage:
- 12,619
- Stock #:
- RTG272162
- VIN:
- 3GTUUEEL5TG272162
Sponsored Listing
2026 GMC Sierra 1500
AT4 Crew Cab 4WD
12,619 mi
Englewood, CO
67 mi away
Good Deal
$54,897
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black
- Transmission:
- Automatic
- Mileage:
- 38,929
- Stock #:
- PZ322664C
- VIN:
- 1GTUUEEL9PZ322664
Price drop
-$1,699
Sponsored Listing
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
38,929 mi
Castle Rock, CO
85 mi away
Good Deal
$48,297
$47,297
- Year:
- 2020
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Gray
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 37,556
- Stock #:
- TLG124076
- VIN:
- 3GTP9EEL9LG124076
New arrival
2020 GMC Sierra 1500
AT4 Crew Cab 4WD
37,556 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$41,667
- Year:
- 2022
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Summit White
- Combined gas mileage:
- 16 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black with Kalahari accents
- Transmission:
- Automatic
- Mileage:
- 58,977
- Stock #:
- 11698VG
- VIN:
- 1GTPUEEL9NZ646479
New arrival
2022 GMC Sierra 1500
AT4 Crew Cab 4WD
58,977 mi
Thornton, CO
48 mi away
Good Deal
$43,998
- Year:
- 2021
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 355 hp 5.3L V8
- Combined gas mileage:
- 18 MPG
- Fuel type:
- Gasoline
- Interior color:
- 4Sb--Leather, Jet Black / Kalahari, Interior Trim
- Transmission:
- Automatic
- Mileage:
- 39,117
- Stock #:
- AMZ294011
- VIN:
- 1GTP9EED5MZ294011
2021 GMC Sierra 1500
AT4 Crew Cab 4WD
39,117 mi
Aurora, CO
59 mi away
Fair Deal
$43,388
- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Gray
- Combined gas mileage:
- 25 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 22,940
- Stock #:
- ARZ128580
- VIN:
- 1GTUUEE8XRZ128580
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
22,940 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$53,027
- Year:
- 2020
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- White
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Gray
- Transmission:
- Automatic
- Mileage:
- 97,697
- Stock #:
- LZ269294T
- VIN:
- 1GTP9EEL9LZ269294
2020 GMC Sierra 1500
AT4 Crew Cab 4WD
97,697 mi
Greeley, CO
21 mi away
Fair Deal
$34,139
- Year:
- 2022
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 277 hp 3L I6 Diesel
- Exterior color:
- White
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 30,482
- Stock #:
- TNG652545
- VIN:
- 3GTUUEET0NG652545
2022 GMC Sierra 1500
AT4 Crew Cab 4WD
30,482 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$47,191
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Gray
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 54,426
- Stock #:
- TPZ179255
- VIN:
- 1GTUUEE85PZ179255
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
54,426 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$45,630
- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Brown
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 54,932
- Stock #:
- PRZ111338
- VIN:
- 1GTUUEEL0RZ111338
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
54,932 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$49,396
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Desert Sand Metallic
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black
- Transmission:
- Automatic
- Mileage:
- 29,550
- Stock #:
- PZ161330C
- VIN:
- 1GTUUEEL7PZ161330
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
29,550 mi
Wheat Ridge, CO
55 mi away
Good Deal
$50,396
- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 37,234
- Stock #:
- L437700A
- VIN:
- 3GTUUEELXRG437700
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
37,234 mi
Longmont, CO
29 mi away
Good Deal
$51,582
- Year:
- 2026
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Black
- Combined gas mileage:
- 15 MPG
- Fuel type:
- Gasoline
- Interior color:
- Black
- Transmission:
- Automatic
- Mileage:
- 12,619
- Stock #:
- RTG272162
- VIN:
- 3GTUUEEL5TG272162
2026 GMC Sierra 1500
AT4 Crew Cab 4WD
12,619 mi
Englewood, CO
67 mi away
Good Deal
$54,897
- Year:
- 2025
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Summit White
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 38,272
- Stock #:
- P7680
- VIN:
- 1GTUUEEL0SZ312985
2025 GMC Sierra 1500
AT4 Crew Cab 4WD
38,272 mi
Northglenn, CO
48 mi away
Fair Deal
$51,192
- Year:
- 2022
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Desert Sand Metallic
- Combined gas mileage:
- 16 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 84,466
- Stock #:
- L564412
- VIN:
- 3GTPUEEL5NG564412
2022 GMC Sierra 1500
AT4 Crew Cab 4WD
84,466 mi
Longmont, CO
29 mi away
Fair Deal
$42,377
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black
- Transmission:
- Automatic
- Mileage:
- 79,934
- Stock #:
- G266443A
- VIN:
- 3GTUUEE89PG222527
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
79,934 mi
Fort Collins, CO
2 mi away
Great Deal
$40,488
- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Gray
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 31,690
- Stock #:
- ARZ304612
- VIN:
- 1GTUUEEL6RZ304612
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
31,690 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$52,199
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Summit White
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 70,492
- Stock #:
- PZ152846T
- VIN:
- 1GTUUEE83PZ152846
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
70,492 mi
Castle Rock, CO
85 mi away
Great Deal
$38,497
- Year:
- 2024
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Black
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black With Kalahari Accents, Perforated Leathe
- Transmission:
- Automatic
- Mileage:
- 42,670
- Stock #:
- ARZ277625
- VIN:
- 1GTUUEELXRZ277625
2024 GMC Sierra 1500
AT4 Crew Cab 4WD
42,670 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$52,502
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 420 hp 6.2L V8
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 17 MPG
- Fuel type:
- Gasoline
- Interior color:
- Jet Black
- Transmission:
- Automatic
- Mileage:
- 38,929
- Stock #:
- PZ322664C
- VIN:
- 1GTUUEEL9PZ322664
Price drop
-$1,699
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
38,929 mi
Castle Rock, CO
85 mi away
Good Deal
$48,297
$47,297
- Year:
- 2022
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 277 hp 3L I6 Diesel
- Exterior color:
- Summit White
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 69,417
- Stock #:
- TG406008A
- VIN:
- 1GTUUEETXNZ642542
2022 GMC Sierra 1500
AT4 Crew Cab 4WD
69,417 mi
Loveland, CO
11 mi away
Fair Deal
$42,589
- Year:
- 2023
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Volcanic Red Tintcoat
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black With Kalahari Accents
- Transmission:
- Automatic
- Mileage:
- 65,020
- Stock #:
- G238264
- VIN:
- 1GTUUEE86PZ238264
2023 GMC Sierra 1500
AT4 Crew Cab 4WD
65,020 mi
Boulder, CO
39 mi away
Good Deal
$43,500
- Year:
- 2025
- Make:
- GMC
- Model:
- Sierra 1500
- Body type:
- Pickup Truck
- Doors:
- 4 doors
- Drivetrain:
- Four-Wheel Drive
- Engine:
- 3L I6 Diesel
- Exterior color:
- Onyx Black
- Combined gas mileage:
- 24 MPG
- Fuel type:
- Diesel
- Interior color:
- Jet Black
- Transmission:
- 10-Speed Automatic
- Mileage:
- 25,577
- Stock #:
- KM203964
- VIN:
- 1GTUUEE81SZ203964
Sponsored Listing
2025 GMC Sierra 1500
AT4 Crew Cab 4WD
25,577 mi
Highlands Ranch, CO
70 mi away
Fair Deal
$54,742
Overview
The GMC Sierra 1500 is a spacious and capable pickup. It is offered in a number of trims providing a wide array of creature comforts. While GMC might be more sooner associated with the chrome-clad Denali variants, the Sierra is also available in more outdoorsy trims, such as the AT4. Designed as a sort of the anti-Denali, the AT4 is designed to get muddy. It features a 2-inch lift, Rancho shocks, upgraded underbody skid plates, an Auto-Trap two-speed transfer case, and a locking rear differential. The AT4 is not without niceties, as it receives a unique black interior with Kalahari accents and a host of creature comforts. The AT4 trim was introduced with the redesigned Sierra 1500 in 2019 and has continued through the 1500’s 2022 model year update.
Key Features
- Gas V8, Duramax Turbodiesel I6
- 2-inch suspension lift w/ Rancho shocks
- Skid plates
- Heated/ventilated front seats, leather upholstery
- Touchscreen infotainment w/ Apple CarPlay, Android Auto
Pricing Details
In Crew Cab configuration, the 2023 GMC Sierra 1500 AT4 carries a $66,700 MSRP. Used examples on CarGurus range from $27,122.00 to $116,673.50 with an average price of $31,687.41. The Sierra 1500 AT4 is available with a number of options packages. The Premium Package adds a number of upgraded driver assistance features. The Technology Package adds a head-up display, bed view camera, and rear camera mirror. The AT4 Preferred Package adds a universal garage door opener, adaptive cruise control, and a power-sliding rear window with a defogger.
Specifications
Performance
Engine
6.2-liter gas V8, 3.0-liter turbodiesel I6
Transmission
Eight-speed automatic (gas), 10-speed automatic (diesel)
Drivetrain
Four-wheel drive (4WD)
Horsepower/Torque
420 hp/460 lb-ft (gas) / 277 hp/460 lb-ft (diesel)
0-60 mph
5.8 seconds
MPG
24 mpg city, 34 mpg highway, 28 combined (6AT) / 26 mpg city, 36 mpg highway, 30 combined (5MT)
Curb weight
4,816 pounds
Dimensions
wheelbase
147.53 inches
length
231.72 inches
width
81.24 inches
height
78.35 inches
*CarGurus meticulously monitors the prices of millions of pre-owned vehicle listings, offering users precise and up-to-date market insights. Historical pricing data excludes any additional dealer fees as of May 3, 2026.
4.0 Overall rating
Filter by rating
Anonymous
Reviewed a 2019 GMC AT4 Crew Cab 4WD on Sep 9, 2024
The truck had all the features I wanted and the price was in-line, or better with others in my search.
Is this review helpful?
Buddy H
Reviewed a 2019 GMC AT4 Crew Cab 4WD on Jan 5, 2025
Slightly over priced for the miles I would pay $29000-$30000 all day
Is this review helpful?
FAQs
How much does the GMC Sierra 1500 AT4 cost in Fort Collins, CO?
The average GMC Sierra 1500 AT4 costs about $30,475.40. The average price has decreased by -5.5% since last year. The 321 for sale near Fort Collins, CO on CarGurus, range from $27,122 to $116,674 in price.
How many GMC Sierra 1500 AT4 vehicles in Fort Collins, CO have no reported accidents or damage?
299 out of 321 for sale near Fort Collins, CO have no reported accidents or damage.
What is the fuel economy of the GMC Sierra 1500 AT4?
Depending on the engine and options, the GMC Sierra 1500 AT4 gets between 15 and 24 MPG/MPGe.
What fuel types are available?
Diesel, Gasoline engines are available.
*CarGurus meticulously monitors the prices of millions of pre-owned vehicle listings, offering users precise and up-to-date market insights. Historical pricing data excludes any additional dealer fees as of May 3, 2026.
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