2021 GMC Sierra 1500

Listed by a franchise dealer in Longmont, CO · On lot for 62 days · VIN verifiable at NHTSA

This used 2021 GMC Sierra 1500 AT4 is listed at $30,926 by mike maroone ford longmont in Longmont, CO 80501. It has 142,945 miles on the odometer. The exterior color is Gray. It features a 4WD drivetrain with a 6.2L V8 engine and Automatic transmission.

OAV's AI-powered Price-to-Market analysis rates this vehicle as a Great Deal — priced below market value. Based on 51 similar vehicles in the Longmont market, the estimated market range is $32,988 to $51,950. The local market range in CO is $33,798 to $34,903.

This vehicle has been on the lot for 62 days.

Analysis powered by OAV's patented inventory standardization technology (U.S. Patent No. 12,236,477).

Market context

This listing is part of OAV's broader Longmont, CO trucks market analysis. OAV compares vehicles using local and regional price-to-market ranges, days-on-lot, comparable count, and demand signals where available.

• View the full Longmont, CO trucks market →
• All vehicles in Longmont, CO →
• All vehicles in CO →
• All vehicles from this dealer →

How this deal is rated

OAV compares this 2021 GMC Sierra 1500 against similar vehicles currently available in the local and regional market — same make, model, and year range, filtered for comparable mileage. Based on where this listing falls in that comparable set, it is rated:

• Great Deal — priced below the typical range for comparable vehicles.
• Fair Price — priced within the expected range for comparable vehicles.
• Overpriced — priced above the typical range for comparable vehicles.

Listings show OAV's PTM-derived deal quality and live market context. OAV-claimed dealers manage their listing profile and route buyer inquiries directly. Paid OAV partners surface additional verification signals.

How this listing is verified

This vehicle listing was aggregated from a franchise dealer in Longmont, CO, one of 57,000+ U.S. dealerships in OAV's nationwide inventory network.The VIN 1GTP9EEL1MZ175203 can be independently verified via the U.S. Department of Transportation's NHTSA VIN decoder, and safety recalls at NHTSA's recall database.

Vehicle attributes (year, make, model, trim, mileage, location) are standardized using OAV's patented methodology (U.S. Patent No. 12,236,477), which normalizes naming conventions and deduplicates cross-listed inventory across the dealership network. Listing data is refreshed daily; Price-to-Market analysis uses comparable vehicles within the same geographic market.

2021 GMC Sierra 1500 Market in CO

Based on 908 comparable 2019-2023 GMC Sierra 1500 listings in CO, the average asking price is $39,915. This listing at $30,926 is $8,989 below average (23% below market). Comparable prices in CO range from $15,780 to $62,593. Similar vehicles spend an average of 50 days on dealer lots in this market.

Similar GMC Sierra 1500 Listings in CO

8 comparable vehicles within ±2 model years and ±30,000 miles (subject trim: AT4 — compare trims below)