Used 2025 GMC Sierra 3500HD for Sale near Westport, ON

Summary

• With 174 currently listed for sale and an average price of $94,220 CAD, 40.2% of 2025 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.

• Favourably reviewed: Owners rated the 2025 GMC Sierra 3500HD 5 / 5 stars.

• 100.0% of 2025 Sierra 3500HD models on CarGurus are accident free.

Why it stands out

The 2025 GMC Sierra 3500HD stands out as a heavy-duty truck that blends serious work capability with a surprisingly broad range of trims and equipment. It is offered in regular cab, extended cab, and crew cab body styles, with either a short bed or a long bed, and buyers can also choose between single- and dual-wheel rear axles. That flexibility helps it serve everything from basic job-site duty to more upscale towing and hauling use.

Power comes from two 6.6-litre V8 options: a gasoline engine with 401 horsepower and 464 pound-feet of torque, or a Duramax turbodiesel V8 with 445 hp and 910 lb-ft of torque. The diesel pairs with a 10-speed automatic, while the gas engine uses a six-speed automatic. Properly equipped, the Sierra 3500HD can haul 3,375 kilograms and tow up to 16,100 kilograms, which places it firmly among the most capable trucks in its class. It also offers a wide spread of trims, from a stripped-down work truck with a seven-inch touchscreen and Apple CarPlay and Android Auto to luxury-focused versions with premium leather, a larger touchscreen, and parking sensors.

What makes the 2025 model especially appealing is how much towing-focused technology is available. Features such as trailer hitch guidance, trailering assist, a jack-knife alert system, a transparent trailer camera view, and adaptive cruise control with trailering assist all speak to its purpose as a serious tow rig. At the same time, the Sierra 3500HD is not without compromises: it can be unwieldy in parking lots, top trims can be prohibitively expensive, and rivals typically can tow more. Still, for buyers who want a heavy-duty GMC with strong capability and a more refined upper end, it has a clear identity.

Other model years to consider

• 2024 GMC Sierra 3500HD

  • Average price: $81,680 CAD
  • Good/great deal percentage: 31.7%
  • User rating: 5 / 5
  • Total listings: 205

• 2023 GMC Sierra 3500HD

  • Average price: $73,795 CAD
  • Good/great deal percentage: 28.6%
  • Total listings: 175

• 2021 GMC Sierra 3500HD

  • Average price: $63,063 CAD
  • Good/great deal percentage: 32.4%
  • User rating: 5 / 5
  • Total listings: 68

This analysis is based on CarGurus' proprietary market data from September 7, 2026, CarGurus experts' opinions, and generative AI.