Used 2021 GMC Sierra 3500HD for Sale near Ontario
Overview
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FAQs
CarGurus Analysis: 2021 GMC Sierra 3500HD
## Summary
- With 87 currently listed for sale and an **average price of $68,175.00 CAD**, 20.7% of 2021 GMC Sierras 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 continues the legacy of GMC’s heavy-duty trucks with impressive towing and hauling capabilities, coupled with a blend of refinement and luxury not typically found in this truck segment. Known for its robust performance, the Sierra 3500HD is particularly commendable for its maximum towing capacity of up to 16,100 kilograms (35,500 pounds) when equipped with the right configuration, thanks to its durable construction and powerful engine options.
This model year also features advanced technology for towing and safety, including a MultiPro tailgate and a suite of driver assistance features, making it an appealing choice for those who need to handle demanding tasks. The optional 6.6-litre Duramax turbodiesel engine elevates the Sierra's performance further, providing both power and efficiency. However, while the higher trim levels can become quite costly, the base model retains the essence of a workhorse, making it suitable for buyers looking for practicality without unnecessary frills. Overall, the 2021 GMC Sierra 3500HD excels by marrying utility with comfort and advanced technology, positioning itself as an appealing choice in the heavy-duty truck market.
## Other model years to consider
- **[2024 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2024-GMC-Sierra-3500HD-c32775)**
- Average price: $82,176.00 CAD
- Good/great deal percentage: 31.5%
- User rating: 5 / 5
- Total listings: 146
- **[2025 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2025-GMC-Sierra-3500HD-c33463)**
- Average price: $96,842.00 CAD
- Good/great deal percentage: 35.3%
- User rating: 5 / 5
- Total listings: 116
- **[2023 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2023-GMC-Sierra-3500HD-c32422)**
- Average price: $76,033.00 CAD
- Good/great deal percentage: 27.1%
- Accident-free percentage: 100.0%
- Total listings: 140
This analysis is based on CarGurus' proprietary market data from May 11, 2026, CarGurus experts' opinions, and generative AI.
5 Overall rating
(3 reviews)This truck is incredible and very comfortable for even daily use.
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.
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 FAQs
How much does the 2021 GMC Sierra 3500HD cost in Ontario?
The average 2021 GMC Sierra 3500HD costs about $68,185.10. The average price has decreased by -2% since last year. The 9 for sale near Ontario on CarGurus, range from $37,480 to $83,990 in price.
How many 2021 GMC Sierra 3500HD vehicles in Ontario have no reported accidents or damage?
9 out of 9 for sale near Ontario have no reported accidents or damage.
What fuel types are available?
Biodiesel, Gasoline engines are available.
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