Used 2021 GMC Sierra 3500HD for Sale Nationwide
683 results
CarGurus Analysis:
2021 GMC Sierra 3500HD
With 689 currently listed for sale and an average price of $53,094.00, 26.7% of 2021 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.
Favorably reviewed: Owners rated the 2021 GMC Sierra 3500HD 5 / 5 stars.
82.1% of 2021 Sierra 3500HD models on CarGurus are accident free.
CarGurus Analysis: 2021 GMC Sierra 3500HD
Summary
With 689 currently listed for sale and an average price of $53,094.00, 26.7% of 2021 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.
Favorably reviewed: Owners rated the 2021 GMC Sierra 3500HD 5 / 5 stars.
82.1% of 2021 Sierra 3500HD models on CarGurus are accident free.
Why it stands out
The 2021 GMC Sierra 3500HD stands out as a robust heavy-duty truck that balances workhorse capabilities with modern comfort and luxury features. Designed with more than just performance in mind, the Sierra 3500HD offers impressive hauling and towing capabilities, making it a perfect choice for buyers who need a reliable partner for serious work. This year, GMC introduced enhancements such as a new jack-knife alert system and upgraded technology in higher trims, including advanced safety features and infotainment systems. While it maintains the rugged sensibilities expected of a heavy-duty truck, the higher trim levels, like the Denali, provide an upscale experience with premium materials and luxury offerings. However, potential buyers should consider that some trims may be prohibitively expensive, and while the truck excels in performance, maneuverability in tight spaces can be a challenge.
Other model years to consider
- Average price: $69,574.00
- Good/great deal percentage: 26.0%
- User rating: 5 / 5
- Total listings: 1,353
- Average price: $58,397.00
- Good/great deal percentage: 26.9%
- Accident-free percentage: 91.6%
- Total listings: 1,299
- Average price: $43,910.00
- Good/great deal percentage: 28.4%
- User rating: 5 / 5
- Total listings: 405
This analysis is based on CarGurus' proprietary market data from April 20, 2026, CarGurus experts' opinions, and generative AI.
Relevant articles
The Best Dually Trucks of 2026
Trucks have gone quite lux lately, and are more often used to get around town than to get work done. The most capable of these trucks are nicknamed “duallies”, which those equipped with dual rear wheels.
GMC Sierra 3500HD Buying Guide: Cost, Reliability, and the Best Years to Buy
Discover the ultimate buying guide for purchasing a used GMC Sierra 3500HD covering each generation since 1988. Whether you're a first-time buyer or a GMC enthusiast, this comprehensive overview will help you research your next pre-owned GMC Sierra 3500HD.
2025 GMC Sierra 3500HD Pricing, Specs, and Release Date
Like its slightly less beefy 2500HD sibling, the 2025 GMC Sierra 3500HD offers added features for the new model year, including a standard trailer brake controller.
5.0 Overall rating
Filter by rating
John P
Reviewed a 2021 GMC Sierra 3500HD on Nov 3, 2023
This truck is incredible and very comfortable for even daily use.
Anonymous
Reviewed a 2021 GMC Sierra 3500HD on Jun 5, 2021
This truck was what was needed to pull our 42’ 5th wheel safely. It has the comfort of a nice ride and the power to pull and the and the strength to haul what I need.
Joe H
Reviewed a 2021 GMC Sierra 3500HD on Feb 8, 2021
The Black Diamond Edition is one of the most popular trucks out there. There has been only 2 in our area and both sold before they arrived at the lot.
2021 GMC Sierra 3500HD Trims
| Trim type | MSRP |
|---|---|
| Denali Crew Cab LB 4WD | $66,900 |
| Double Cab LB 4WD | $40,200 |
| Crew Cab LB 4WD | $44,800 |
| SLE Crew Cab 4WD | $49,400 |
| Crew Cab 4WD | $44,600 |
| AT4 Crew Cab 4WD | $60,300 |
| SLT Crew Cab 4WD | $57,400 |
| Denali Crew Cab 4WD | $66,700 |
2021 GMC Sierra 3500HD Price Trends
CarGurus tracks the prices of millions of used car listings every year. See how the average price of 2021 GMC Sierra 3500HD prices has changed over time.
See more price trends
