Used 2018 GMC Terrain for Sale nearSaint Louis, MO

Compare 2018 GMC Terrain Trims in Saint Louis, MO

The 2018 GMC Terrain offers a range of trims from budget-friendly options to sportier models, catering to various preferences and needs.

• Starting at $12,998
• Best MPG/MPGe: 26 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 — "Who It's For"

The SLE is the pick for shoppers who want essential features without paying for extras. It's the most budget-friendly option in the lineup.

• Avg. market price: $12,998 (updated weekly)
• MPG/MPGe: 26 city / 30 hwy
• Inventory: 5 listings — lower availability; may limit negotiating room
• View SLE listings

SLE AWD — "Who It's For"

The SLE AWD is the choice for shoppers seeking all-wheel drive without a hefty price tag. It balances features and affordability well.

• Avg. market price: $13,147 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 19 listings — lower availability; may limit negotiating room
• View SLE AWD listings

SLT AWD — "Who It's For"

The SLT AWD is the pick for shoppers who want a sporty feel with premium features. It's the most popular trim for good reason.

• Avg. market price: $13,301 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 24 listings
• View SLT AWD listings

Denali AWD — "Who It's For"

The Denali AWD is ideal for shoppers wanting luxury and capability in one package. It offers the most advanced features in the lineup.

• Avg. market price: $13,147 (updated weekly)
• MPG/MPGe: 21 city / 26 hwy
• Inventory: 20 listings
• View Denali AWD listings

Trim Recommendations

Most Popular — SLT AWD

With 24 active listings, the SLT AWD is the clear volume leader in the lineup, offering a great mix of features and performance.

Browse SLT AWD listings

Best Budget Option — SLE

At $12,998 avg market price — below the lineup median of $13,147 — it's the most accessible entry point.

Browse SLE listings

Best for Fuel Economy — SLE

The SLE offers the best fuel efficiency in the lineup with an impressive MPG/MPGe of 26/30.

Browse SLE listings

These recommendations are based on CarGurus' proprietary market data from November 12, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2018 GMC Terrain cost?

Prices have softened 9.62% compared to this time last year, making it a favorable time to shop this model year.

There are 1,699 listings available, which suggests you have a meaningful amount of inventory to compare.

Is the 2018 GMC Terrain a good car?

Yes — the 2018 GMC Terrain earns a 4.7/5 user rating, and our experts rate it 6.2/10. The model scores 8/10 across Performance and Form and function.

Owners consistently praise its comfort, spaciousness, and the variety of features available, especially in higher trim levels. Many also describe it as smooth and enjoyable to drive, with the 2.0L turbo engine drawing especially positive feedback. For you, that means the Terrain can make sense if you want a compact crossover with a roomy cabin and a more upscale-feeling feature set, even if the overall package is less convincing under closer scrutiny. Good and great deals account for 32.5% of listings, which gives you some room to shop selectively.

Is the 2018 GMC Terrain reliable?

Owners rate it 4.7/5, a strong signal of long-term satisfaction.

The owner feedback points to a vehicle that many people found comfortable, spacious, and enjoyable to live with over time, with several reviewers specifically calling out the 2.0L turbo as a strong point. The expert drive notes also describe the Terrain as smooth and satisfying when equipped with the stronger engine, while the overall ownership picture is tempered by concerns about brake sensitivity, lack of power in some situations, and pricing. If you’re shopping used, the main long-term risk is paying too much for a trim or configuration that doesn’t deliver enough everyday value for the money.

What should I look for when buying a used 2018 GMC Terrain?

At 60.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle-history report and then prioritize a thorough pre-purchase inspection, especially if you’re considering a higher-mileage example or one with a prior claim. Focus on overall condition, signs of uneven wear, and whether the equipment on the car matches the trim level you’re paying for. Because pricing can climb quickly on better-equipped versions, it’s worth making sure the features and condition justify the asking price.

Key things to evaluate:

• Trim level: The Terrain is offered in four trim levels: SL, SLE, SLT, and Denali. The SL is the most stripped-down version, with FWD, the 1.5-liter engine, and limited paint choices, while the Denali adds extra brightwork, a more upscale look, and premium interior touches. If you want the best value, the SLE is the minimum starting point, but the higher trims are where the feature content becomes more appealing.
• Powertrain: You can choose among a turbocharged 1.5-liter 4-cylinder gas engine, a turbocharged 1.6-liter diesel engine, and a turbocharged 2.0-liter gas engine. The 1.5-liter is described as merely adequate, while the 2.0-liter is the quicker and more satisfying choice; FWD and AWD are both available.
• Safety package: Teen Driver technology and Rear Seat Reminder are standard. Other driver-assistance and collision-avoidance systems are available, but adaptive cruise control and a higher-speed automatic emergency braking system are missing.
• Infotainment: The Terrain uses an 8-inch touchscreen with Apple CarPlay, Android Auto, OnStar subscription services, a 4G LTE Wi-Fi hotspot, navigation, an SD card reader, and four USB data ports. Wireless device charging is included on Denali.
• Fuel efficiency: The 2.0-liter test vehicle averaged 22.6 mpg, and the 1.5-liter was described as delivering disappointing fuel economy of 23.3 mpg.

Which 2018 GMC Terrain trim should I buy?

The 2018 GMC Terrain is offered in 4 trim levels: SL, SLE, SLT, and Denali.

Here's the short version:

• SL: This is the entry point, but it’s very bare-bones, with FWD, the 1.5-liter engine, and limited paint choices. It makes sense only if you’re chasing the lowest possible price and can live with the stripped-down setup.
• SLE: This is the best-value starting point because it gets you beyond the most basic configuration without jumping too far up the price ladder. If you want a Terrain that feels more usable without overcommitting, this is the trim to target first.
• SLT: This is the better choice if you want a more upscale feel and more available equipment without going all the way to Denali pricing. It’s the trim to consider if comfort and features matter more than absolute value.
• Denali: This is the most luxurious version, with extra brightwork, premium leather, wireless charging, and the 7-speaker Bose audio system. It suits you best if you want the most upscale Terrain and are willing to pay for it.

Teen Driver technology and Rear Seat Reminder are standard, while other driver-assistance features are mostly optional.

Is now a good time to buy a used 2018 GMC Terrain?

This is a moderate, selective buyer’s market, so you can shop carefully and still find opportunities.

• Deal availability: 32.5% of listings are priced as good or great deals.
• Inventory: There are 1,699 listings available.
• Price trend: Prices have softened 9.62% compared with last year.
• Clean inventory: 60.6% of listings are accident-free.

If you find a listing below $13,610, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2018 GMC Terrain's resale value?

The current average of $13,610 sits slightly below last year's $15,058.

That price movement suggests the Terrain has already absorbed a meaningful amount of depreciation, which can help future sellers if they buy at the right price today. If you purchase near the current market average or below it, you may have a better chance of limiting your loss when it’s time to sell. The flip side is that a softer market can also make it harder to recover premium pricing unless your vehicle is especially clean, well-equipped, and well maintained.

Vehicles with strong owner satisfaction ratings, like this model year's 4.7/5, tend to retain buyer demand, which supports resale value over time.

Is the 2018 GMC Terrain safe?

The 2018 Terrain earns a four-star overall rating from NHTSA, including a three-star rating for rear seat side-impact protection.

It earns a 5/10 safety score from our experts.

Teen Driver technology is standard, letting you set vehicle limits and review vehicle-use reports, and Rear Seat Reminder is also standard. However, adaptive cruise control and a higher-speed automatic emergency braking system are missing, and the rear-seat side-impact result is a notable weakness for a vehicle that may serve families. That shortcoming is important to weigh if you plan to use this SUV for passengers in the back seat.

Should I buy a 2018 GMC Terrain or consider a different year?

If you're weighing the 2018 against nearby model years, here's how to think about it:

Choose the 2018 if:

• 32.5% of listings are priced as good or great deals.
• At 60.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 9.62% compared with last year.
• Owners rate it 4.7/5 — a strong satisfaction signal.
• The expert summary says the 2018 Terrain is conceptually appealing but falls apart under scrutiny, with a questionable value equation and safety concerns.

The bottom line: If you want a used Terrain and can find a clean, well-priced example, the 2018 can work as a value play. If you’re more focused on safety confidence, stronger overall execution, or a better all-around ownership proposition, a different year may be the smarter path. For price-sensitive buyers, the 2018 only makes sense when the discount is meaningful and the vehicle history is clean.

How does the 2018 GMC Terrain compare to the 2018 Chevrolet Equinox?

Our experts score the 2018 GMC Terrain 6.2/10 and the 2018 Chevrolet Equinox 7.2/10.

The Terrain and Equinox share the same basic hardware, but the Equinox comes out ahead overall in our experts’ scoring. The Terrain’s strengths are its available upscale trim content and its slightly more premium presentation, while its weaknesses include safety concerns and a tougher value case. The Equinox offers a lower average used price, more listings, and better highway fuel economy, which makes it the more practical choice for many shoppers.

These recommendations are based on CarGurus' proprietary market data from November 10, 2026, CarGurus experts' opinions, and generative AI.