Is the $44,500 price on this 2021 GMC Sierra 3500HD a good deal?

OAV rates this as Fair Price because the asking price of $44,500 is within the typical market range for this vehicle.

What is the average price for a 2021 GMC Sierra 3500HD in CO?

Based on 79 comparable listings in CO, the average asking price for a 2019-2023 GMC Sierra 3500HD is $53,203, with prices ranging from $39,999 to $66,516.

How long does a 2021 GMC Sierra 3500HD typically stay on dealer lots?

Comparable GMC Sierra 3500HD listings in CO spend an average of 64 days on dealer lots.

Where is this 2021 GMC Sierra 3500HD located?

This vehicle is listed in Castle Rock, CO 80104. VIN: 1GT49SEY8MF235699. Mileage: 75,641 miles.

What is the fair market price range for this 2021 GMC Sierra 3500HD?

OAV's Price-to-Market analysis estimates the fair market range is $44,500 to $44,500, based on available comparable vehicles.

Vehicle Details

VIN1GT49SEY8MF235699

TrimBase

Exterior ColorBrown

Drivetrain4WD

Engine6.6L V8

TransmissionAutomatic

Fuel TypeDiesel

Inventory Typeused

Days on Lot81

2021 GMC Sierra 3500HD

Base

Unscored

$44,50075,641 miles

Castle Rock, CO 80104

Market price position

Lowest comparable ($)

44,500

Highest comparable ($)

44,500

This vehicle's price ($)

44,500

$44,500 · only listing at this price

$44,500 — single data point

Regional range: $44,500 (0 listings)
vs. market: Exact match — no spread
Comparable vehicles: 0

Demand-Verified· Backed by recent sales data

Similar vehicles recently sold in an estimated 12–59 days.

Dealer Info

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Castle Rock, CO

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About This 2021 GMC Sierra 3500HD

Listing updated: May 14, 2026

Listed by an independent dealer in Castle Rock, CO · On lot for 81 days · VIN verifiable at NHTSA

This used 2021 GMC Sierra 3500HD Base is listed at $44,500 by an independent dealer in Castle Rock, CO 80104. It has 75,641 miles on the odometer. The exterior color is Brown. It features a 4WD drivetrain with a 6.6L V8 engine and Automatic transmission.

OAV's AI-powered Price-to-Market analysis rates this vehicle as Unscored due to insufficient comparable data. Based on available similar vehicles in the Castle Rock market, the estimated market range is $44,500 to $44,500.

This vehicle has been on the lot for 81 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 Castle Rock, 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.

How this deal is rated

OAV compares this 2021 GMC Sierra 3500HD 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.

This rating refreshes daily as inventory enters and leaves the market. The dealer on this listing has not yet activated on OAV, so the business name and contact details are anonymized here. Activated (paying) dealers appear with their verified business name and a Verified badge.

How this listing is verified

This vehicle listing was aggregated from an independent dealer in Castle Rock, CO, one of 57,000+ U.S. dealerships in OAV's nationwide inventory network.The VIN 1GT49SEY8MF235699 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 3500HD Market in CO

Comparable Vehicles

Average Price

$53,203

Price Range

$39,999–$66,516

Avg Days on Lot

Based on 79 comparable 2019-2023 GMC Sierra 3500HD listings in CO, the average asking price is $53,203. This listing at $44,500 is $8,703 below average (16% below market). Comparable prices in CO range from $39,999 to $66,516. Similar vehicles spend an average of 64 days on dealer lots in this market.