Used 2018 GMC Terrain for SaleNationwide

Compare 2018 GMC Terrain Trims

The 2018 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 $12,430
• Best MPG/MPGe: 28 city / 38 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: $12,430 (updated weekly)
• MPG/MPGe: 26 city / 30 hwy
• Inventory: 326 listings
• View SLE listings

SLE AWD — "Who It's For"

The SLE AWD is the pick for shoppers who want all-wheel drive without a hefty price tag. It offers a solid mix of features and capability.

• Avg. market price: $13,269 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 1,901 listings — widest selection in the lineup
• View SLE AWD listings

SLT — "Who It's For"

The SLT is the pick for shoppers who want a balance of luxury and practicality without going for the top trim. It includes premium features at a reasonable price.

• Avg. market price: $14,276 (updated weekly)
• MPG/MPGe: 26 city / 30 hwy
• Inventory: 309 listings
• View SLT listings

SLT AWD — "Who It's For"

The SLT AWD is the pick for shoppers who want sporty performance and all-wheel drive. It's the most popular trim, offering a great blend of features.

• Avg. market price: $14,895 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 2,018 listings — widest selection in the lineup
• View SLT AWD listings

SLE Diesel AWD — "Who It's For"

The SLE Diesel AWD is the pick for shoppers who want fuel efficiency and all-wheel drive. It offers a unique diesel option for better mileage.

• Avg. market price: $14,510 (updated weekly)
• MPG/MPGe: 28 city / 38 hwy
• Inventory: 14 listings — lower availability; may limit negotiating room
• View SLE Diesel AWD listings

SLT Diesel AWD — "Who It's For"

The SLT Diesel AWD is the pick for shoppers who want a premium experience with diesel efficiency. It combines luxury with great fuel economy.

• Avg. market price: $16,987 (updated weekly)
• MPG/MPGe: 28 city / 38 hwy
• Inventory: 11 listings — lower availability; may limit negotiating room
• View SLT Diesel AWD listings

Denali — "Who It's For"

The Denali is the pick for shoppers who want luxury features in a compact SUV. It offers a refined experience without going to the larger models.

• Avg. market price: $16,329 (updated weekly)
• MPG/MPGe: 22 city / 28 hwy
• Inventory: 171 listings — lower availability; may limit negotiating room
• View Denali listings

Denali AWD — "Who It's For"

The Denali AWD is the pick for shoppers who want a luxury SUV with all-weather capability. It combines upscale features with performance.

• Avg. market price: $16,912 (updated weekly)
• MPG/MPGe: 21 city / 26 hwy
• Inventory: 1,150 listings — widest selection in the lineup
• View Denali AWD listings

Trim Recommendations

Most Popular — SLT AWD

With 2,018 active listings, the SLT AWD is the clear volume leader in the lineup.

Browse SLT AWD listings

Best Budget Option — SLE

At $12,430 avg market price — below the lineup median of $14,702 — it's the most accessible entry point.

Browse SLE listings

Best for Fuel Economy — SLE Diesel AWD

The SLE Diesel AWD offers the best fuel efficiency with 28 city / 38 hwy MPG/MPGe.

Browse SLE Diesel AWD listings

These recommendations are based on CarGurus' proprietary market data from September 17, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2018 GMC Terrain cost?

Prices have softened 9.76% compared to this time last year, making it a favorable time to shop this model year.

There are 1,804 listings available, which gives you a solid amount of inventory to compare.

Is the 2018 GMC Terrain a good car?

Yes — owners rate it 4.71/5, and the expert rating is 6.17/10. 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 makes the most sense if you want a compact crossover that emphasizes comfort and everyday usability over a more rugged personality. Good and great deals account for 31.2% of listings, so you still have room to shop selectively.

Is the 2018 GMC Terrain reliable?

Owners rate it 4.71/5, a strong signal of long-term satisfaction.

Owner feedback points to a vehicle that many people find comfortable, spacious, and enjoyable to live with over time, and reviewers specifically call out the 2.0L turbo engine as a smooth, satisfying choice. The expert evaluation also describes the Terrain as a vehicle that can feel appealing in concept and useful in daily driving, with a cabin that improves on layout and materials quality. The same evaluation also notes that the Terrain’s value proposition is questionable, so long-term ownership risk is less about basic livability and more about whether you’ll feel satisfied with what you paid for it.

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

At 63.1% 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 pre-purchase inspection, especially if you’re considering a higher-mileage example or one with visible cosmetic repairs. Focus on body condition, panel alignment, tire wear, brake feel, and any signs that the vehicle has been used hard or repaired after a collision. If you’re shopping for a family vehicle, pay extra attention to the rear-seat area and the overall condition of the safety equipment.

Key things to evaluate:

• Trim level: The Terrain is offered in SL, SLE, SLT, and Denali. The SL is stripped down, with FWD only, the 1.5-liter engine only, and limited paint choices, while higher trims add more comfort, convenience, and upscale touches. If you want the best value, the SLE is the minimum starting point, but the higher trims are where the Terrain’s 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 2.0-liter is the stronger and more satisfying choice, while the 1.5-liter is the standard engine and the diesel is part of the broader lineup.
• 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 and Android Auto. It also offers OnStar subscription services with a 4G LTE Wi-Fi hotspot, navigation, an SD card reader, and four USB data ports.
• Fuel efficiency: The 1.5-liter engine returned 23.3 mpg in testing, and the 2.0-liter engine averaged 22.6 mpg in testing.

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 bare-bones entry point, with FWD only, the 1.5-liter engine only, and very limited paint and option choices. It makes sense only if you’re chasing the lowest possible price and can live without much flexibility.
• SLE: This is the minimum trim most shoppers should consider. It opens the door to a more realistic ownership experience and is the starting point if you want to build in useful equipment without jumping straight to the top of the range.
• SLT: This is the better-equipped middle ground if you want more comfort and convenience without going all the way to Denali pricing. It’s the trim to target if you want the Terrain’s upscale feel without overcommitting.
• Denali: This is the most luxurious version, with extra brightwork, premium leather, burnished aluminum trim, wireless device charging, and a 7-speaker Bose premium sound 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 market for selective buyers, so you can shop with some leverage if you’re patient.

• Deal availability: 31.2% of listings are priced as good or great deals.
• Inventory: There are 1,804 listings available.
• Price trend: Prices have softened 9.76% compared with last year.
• Clean inventory: 63.1% of listings are accident-free.

If you find a listing below $14,143, 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 $14,150 sits slightly below last year's $15,681.

That decline suggests the Terrain has already absorbed a meaningful amount of depreciation, which can help you as a buyer today but may also limit upside if you plan to resell soon. If you buy at the right price, the softer market can work in your favor because you’re starting from a lower entry point. Still, the model’s value story depends heavily on condition, equipment, and how well the vehicle has been maintained.

Vehicles with strong owner satisfaction ratings, like this model year's 4.71/5, 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 and a 3-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 driving reports, and Rear Seat Reminder is also standard. The Terrain’s safety equipment list includes the usual driver-assistance and collision-avoidance systems, but adaptive cruise control and a higher-speed automatic emergency braking system are missing. The rear-seat side-impact result is the key caveat you should keep in mind, especially if you plan to use this SUV for family duty.

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:

• 31.2% of listings are priced as good or great deals.
• At 63.1% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 9.76% compared with last year.
• Owners rate it 4.71/5 — a strong satisfaction signal.
• The expert review says the 2018 Terrain looks appealing at first glance but falls short under closer scrutiny, with safety and value concerns that matter if you’re shopping carefully.

The bottom line: If you want the 2018 Terrain, the best path is to shop selectively, verify history, and focus on condition and equipment rather than chasing the cheapest example. If you’re especially price-sensitive, the softened market can still make this year worth considering, but you should compare it carefully against other model years and similar compact crossovers before committing.

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