Used 2021 GMC Sierra 3500HD for Sale near Ontario
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CarGurus Analysis: 2021 GMC Sierra 3500HD
Summary
With 83 currently listed for sale and an average price of $70,000.00 CAD, 31.3% of 2021 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.
Favourably reviewed: Owners rated the 2021 GMC Sierra 3500HD 5 / 5 stars.
100.0% of 2021 Sierra 3500HD models on CarGurus are accident free.
Why it stands out
The 2021 GMC Sierra 3500HD is a robust heavy-duty truck that combines impressive towing and hauling capabilities with a touch of luxury, especially in its higher trims like the Denali. This model is part of the fifth generation, which has seen significant improvements in technology and performance since its debut in 2020. The Sierra 3500HD can tow up to 16,100 kilograms (35,500 pounds) when properly equipped, making it a top choice for those needing serious workhorse capabilities. The truck is available with two powerful engine options, including a 6.6-litre Duramax turbodiesel V8 that delivers 445 horsepower and a staggering 910 lb-ft of torque.
In addition to its power, the Sierra 3500HD offers a range of smart tech features designed for towing and off-roading, enhancing its appeal to buyers who require both functionality and comfort. The interior is well-appointed, especially in the Denali trim, which features premium materials and advanced infotainment options. However, potential buyers should be aware that while the Sierra 3500HD excels in many areas, its larger size can make it unwieldy in tighter spaces, and the top trims can be quite expensive.
Other model years to consider
- Average price: $70,000.00 CAD
- Good/great deal percentage: 29.8%
- User rating: 5 / 5
- Total listings: 161
- Average price: $70,000.00 CAD
- Good/great deal percentage: 34.2%
- Total listings: 155
- Average price: $70,000.00 CAD
- Good/great deal percentage: 33.3%
- User rating: 5 / 5
- Total listings: 144
This analysis is based on CarGurus' proprietary market data from July 27, 2026, CarGurus experts' opinions, and generative AI.
5.0 Overall rating
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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 |
|---|---|
| SLT Crew Cab 4WD | $57,400 |
| SLE Double Cab LB 4WD | $47,800 |
| SLE Crew Cab 4WD | $49,400 |
| AT4 Crew Cab 4WD | $60,300 |
| 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.
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