Used 2021 GMC Terrain for Sale nearSaint Louis, MO

Compare 2021 GMC Terrain Trims in Saint Louis, MO

The 2021 GMC Terrain offers a range of trims from budget-friendly options to sportier all-wheel-drive models, catering to various needs and preferences.

• Starting at $16,694
• Best MPG/MPGe: 25 city / 30 hwy
• Most Popular: SLT AWD

Trim Overview

Prices updated weekly from CarGurus listings.

Quick Compare Table

Listing prices sourced from CarGurus — updated weekly. OEM specs from manufacturer data.

Missing data displayed as "—".

Trim Deep Dives

SLE FWD — "Who It's For"

The SLE FWD is the pick for shoppers who want a well-equipped SUV without the higher price of all-wheel drive.

• Avg. market price: $16,944 (updated weekly)
• MPG/MPGe: 25 city / 30 hwy
• Inventory: 93 listings
• View SLE FWD listings

SLE AWD — "Who It's For"

The SLE AWD is the pick for shoppers who want all-wheel drive without breaking the bank.

• Avg. market price: $16,875 (updated weekly)
• MPG/MPGe: 25 city / 28 hwy
• Inventory: 96 listings
• View SLE AWD listings

SLT FWD — "Who It's For"

The SLT FWD is the pick for shoppers who want a touch of luxury without the higher price of the AWD models.

• Avg. market price: $16,694 (updated weekly)
• MPG/MPGe: 25 city / 30 hwy
• Inventory: 60 listings
• View SLT FWD listings

SLT AWD — "Who It's For"

The SLT AWD is the pick for shoppers who want sporty features and all-wheel drive in a popular package.

• Avg. market price: $17,400 (updated weekly)
• MPG/MPGe: 25 city / 28 hwy
• Inventory: 126 listings — widest selection in the lineup
• View SLT AWD listings

Denali AWD — "Who It's For"

The Denali AWD is the pick for shoppers who want top-tier luxury and advanced tech features in their SUV.

• Avg. market price: $16,944 (updated weekly)
• MPG/MPGe: 25 city / 28 hwy
• Inventory: 76 listings
• View Denali AWD listings

Trim Recommendations

Most Popular — SLT AWD

With 126 active listings, the SLT AWD is the clear volume leader in the lineup.

Browse SLT AWD listings

Best Budget Option — SLT FWD

At $16,694 avg market price — below the lineup median of $16,944 — it's the most accessible entry point.

Browse SLT FWD listings

Best for Fuel Economy — SLE FWD

The SLE FWD offers the best fuel economy in the lineup at 25/30 MPG.

Browse SLE FWD listings

These recommendations are based on CarGurus' proprietary market data from October 8, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2021 GMC Terrain cost?

Prices have softened 10.04% compared to this time last year, making it a favorable time to shop this model year.

There are 2,427 listings available, which gives you a solid pool to compare prices and conditions.

Is the 2021 GMC Terrain a good car?

Yes — the 2021 GMC Terrain earns a 5/5 user rating, which points to strong owner satisfaction.

Drivers consistently praise its stylish interior, feature set, smooth ride, and fuel efficiency. The overview also supports that appeal for everyday use, especially if you want a comfortable ride, a roomy cabin, and a more polished feel than many compact SUV rivals.

The market also looks reasonably shopper-friendly, with 36.1% of listings marked as good or great deals.

Is the 2021 GMC Terrain reliable?

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

User feedback highlights a vehicle that feels dependable in daily use, with owners emphasizing its smooth ride and overall value. The combination of strong satisfaction and praise for efficiency and comfort suggests this is a model many buyers feel confident living with over time.

For used buyers, that kind of owner confidence can reduce long-term ownership risk, especially if you verify maintenance history and condition carefully.

What should I look for when buying a used 2021 GMC Terrain?

At 74.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should run a vehicle history report before you commit, then prioritize a pre-purchase inspection so you can catch hidden body, suspension, or repair issues. Focus closely on overall condition, since accident history can matter more than mileage alone when you’re comparing similar listings.

Is now a good time to buy a used 2021 GMC Terrain?

This looks like a moderate, selective buyer’s market, so you can shop patiently and still find value.

• Deal availability: 36.1% of listings are priced as good or great deals.
• Inventory: There are 2,427 listings available.
• Price trend: Prices have softened 10.04% compared with last year.
• Clean inventory: 74.6% of listings are accident-free.

If you find a listing below $18,132, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2021 GMC Terrain's resale value?

The current average of $18,132 sits slightly below last year's $20,155.

That price decline suggests the Terrain has become more affordable in the used market, which can help you buy at a lower entry point today. For a future seller, though, softer pricing means resale gains may be limited unless your vehicle stands out for condition, mileage, and maintenance history.

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 2021 GMC Terrain or consider a different year?

If you're weighing the 2021 against nearby model years, here's how to think about it:

Choose the 2021 if:

• 36.1% of listings are priced as good or great deals.
• At 74.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 10.04% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2022 if:

• At $21,581, the 2022 costs more than the current year's $18,132 average.
• It adds an AT4 trim with standard all-wheel drive and a more rugged appearance.

The bottom line: If you want the better value, the 2021 is the stronger starting point because it costs less and still has strong owner approval. If you’re willing to pay more for the 2022’s added rugged styling and standard AWD on the AT4, that newer year may be worth a look; otherwise, the 2021 is the smarter pick for price-sensitive buyers.

These recommendations are based on CarGurus' proprietary market data from October 6, 2026, CarGurus experts' opinions, and generative AI.