Used 2020 GMC Sierra 3500HD for Sale near Alberta

How much does the 2020 GMC Sierra 3500HD cost?

Prices have softened 4.47% compared to this time last year, making it a favourable time to shop this model year.

There are 61 listings available, which gives you a modest amount of choice in the market.

Is the 2020 GMC Sierra 3500HD a good car?

Yes — the 2020 GMC Sierra 3500HD earns a 5/5 user rating, which points to strong owner satisfaction. Owners consistently praise its impressive performance when pulling heavy loads, along with a comfortable and well-built cabin. The review summary also highlights its strong track record compared with competitors like Ford and Ram, which matters if you want a heavy-duty truck that feels capable and confidence-inspiring for work use. With 27.9% of listings marked as good or great deals, you still have some room to shop carefully.

Is the 2020 GMC Sierra 3500HD reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

The review summary points to a truck that owners see as dependable and well-built, especially when it is used for demanding towing and hauling. That kind of feedback suggests the Sierra 3500HD has the sort of long-term character used buyers often want in a heavy-duty truck. For you, the main ownership risk is less about day-to-day confidence and more about making sure any used example has been maintained properly given the demands of heavy-duty use.

Is now a good time to buy a used 2020 GMC Sierra 3500HD?

This looks like a moderate, selective buyer's market, so you can shop with some leverage if you are patient and compare listings carefully.

• Deal availability: 27.9% of listings are priced as good or great deals.
• Inventory: There are 61 listings available.
• Price trend: Prices have softened 4.47% compared with last year.

If you find a listing below $57,096 CAD, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 GMC Sierra 3500HD's resale value?

The current average of $61,170 CAD sits slightly below last year's $64,033 CAD.

That price movement suggests the market has eased a bit, which can make the truck more attractive to buyers today but may also temper short-term gains for a future seller. If you buy at the right price, you may have a better chance of preserving value by starting from a lower entry point. Strong demand for heavy-duty trucks can still support resale, especially when the vehicle has a reputation for satisfying owners and handling serious work well.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2020 GMC Sierra 3500HD or consider a different year?

If you're weighing the 2020 against nearby model years, here's how to think about it:

Choose the 2020 if:

• 27.9% of listings are priced as good or great deals.
• Price trend: Prices have softened 4.47% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

The bottom line: The 2020 is the right pick if you want the redesigned Sierra 3500HD at a price that has already softened and you value strong owner satisfaction. If you are especially price-sensitive, you may want to compare nearby years for a lower entry point, but the 2020 remains the better all-around choice when you want a newer redesign with solid market support.

These recommendations are based on CarGurus' proprietary market data from September 15, 2026, CarGurus experts' opinions, and generative AI.