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 more luxurious models, catering to various preferences and needs.

• Starting at $13,101
• 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 a well-equipped SUV without paying for luxury features. It's the most budget-friendly option in the lineup.

• Avg. market price: $13,101 (updated weekly)
• MPG/MPGe: 26 city / 30 hwy
• Inventory: 39 listings
• View SLE listings

SLE AWD — "Who It's For"

The SLE AWD is the choice for those seeking all-wheel drive without a hefty price tag. It balances affordability with capability.

• Avg. market price: $14,110 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 91 listings
• View SLE AWD listings

SLT — "Who It's For"

The SLT is ideal for buyers wanting a blend of comfort and technology without going for the top-tier trims. It offers a solid mix of features.

• Avg. market price: $18,795 (updated weekly)
• MPG/MPGe: 26 city / 30 hwy
• Inventory: 20 listings
• View SLT listings

SLT AWD — "Who It's For"

The SLT AWD is perfect for those who want a sporty feel with the added benefit of all-wheel drive. It's the most popular trim for good reason.

• Avg. market price: $15,594 (updated weekly)
• MPG/MPGe: 24 city / 28 hwy
• Inventory: 104 listings — widest selection in the lineup
• View SLT AWD listings

Denali — "Who It's For"

The Denali is for shoppers who desire luxury features in a compact SUV. It combines premium materials with advanced technology.

• Avg. market price: $15,995 (updated weekly)
• MPG/MPGe: 22 city / 28 hwy
• Inventory: 11 listings — lower availability; may limit negotiating room
• View Denali listings

Denali AWD — "Who It's For"

The Denali AWD is suited for those who want a luxury SUV with all-weather capability. It offers a premium experience with added versatility.

• Avg. market price: $13,249 (updated weekly)
• MPG/MPGe: 21 city / 26 hwy
• Inventory: 80 listings
• View Denali AWD listings

Trim Recommendations

Most Popular — SLT AWD

With 104 active listings, the SLT AWD is the clear volume leader in the lineup.

Browse SLT AWD listings

Best Budget Option — SLE

At $13,101 avg market price — below the lineup median of $14,852 — 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 26/30 MPG/MPGe.

Browse SLE listings

These recommendations are based on CarGurus' proprietary market data from September 2, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2018 GMC Terrain cost?

Prices have softened 9.69% compared to this time last year, making it a favorable time to shop this model year.

There are 1,835 listings available, which suggests solid inventory for shoppers comparing prices and trims. If you find a listing below $14,173, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2018 GMC Terrain a good car?

Yes — the 2018 GMC Terrain earns a 4.71/5 user rating, and its 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, particularly with the 2.0L turbo engine. In practical terms, that makes it appealing if you want a compact crossover SUV with a roomy cabin and a more upscale feature set in the right configuration.

The market shows 30.2% good or great deals, which gives you some room to shop selectively.

Is the 2018 GMC Terrain reliable?

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

The owner feedback points to a vehicle that feels comfortable, spacious, and generally enjoyable to live with over time, with many drivers describing it as smooth and satisfying in daily use. That said, some reviewers mention brake sensitivity, a lack of power in certain situations, and pricing concerns, so the ownership experience can depend heavily on the engine and trim you choose.

The expert drive notes also point to a more dependable feel when you choose the stronger turbocharged engine, which is described as curing the smaller motor’s mere adequacy and making the vehicle more satisfying to drive. For used buyers, the main long-term risk is ending up with a configuration that feels underpowered or overpriced relative to what you expected.

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

At 61.3% 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 the listing price looks unusually attractive. Focus on body condition, repair quality, and signs of prior damage, since accident history can affect both reliability confidence and resale value. It also makes sense to compare trim equipment carefully, because the Terrain’s value changes a lot depending on how well equipped it is.

Key things to evaluate:

• Trim level: The Terrain is offered in SL, SLE, SLT, and Denali. The SL is stripped down, with only FWD, the turbocharged 1.5-liter engine, and limited paint choices, while higher trims add more comfort, convenience, and upscale touches. If you want the best balance of equipment and value, the SLE is the minimum practical starting point, while Denali is the most premium-feeling choice.
• 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 option, while the 1.5-liter is described as merely adequate.
• Safety package: Standard Teen Driver technology and Rear Seat Reminder are included. Other driver-assistance and collision-avoidance systems are mostly optional, and adaptive cruise control plus higher-speed automatic emergency braking 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 1.5-liter engine is associated with 23.3 mpg in testing, while the 2.0-liter AWD test vehicle averaged 22.6 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 bare-bones entry point, with FWD, the turbocharged 1.5-liter engine, and very limited options. It makes sense only if you want the lowest possible starting price and are willing to give up most convenience and flexibility.
• SLE: This is the best-value choice for most shoppers because it opens the door to the more realistic Terrain ownership experience without jumping straight to the highest prices. It’s the trim to target if you want a sensible mix of equipment and cost.
• SLT: This trim is the better pick if you want a more upscale feel and more available features without going all the way to Denali. It suits you if comfort and convenience matter more than minimizing purchase price.
• Denali: This is the top-end choice, with the most premium presentation and features, including wireless charging and a 7-speaker Bose premium sound system. Choose it if you want the most luxurious version of the Terrain and are comfortable paying for it.

Standard Teen Driver technology and Rear Seat Reminder are included.

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 worthwhile listings.

• Deal availability: 30.2% of listings are priced as good or great deals.
• Inventory: There are 1,835 listings available.
• Price trend: Prices have softened 9.69% compared with last year.
• Clean inventory: 61.3% of listings are accident-free.

If you find a listing below $14,173, 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 $14,168 sits slightly below last year's $15,687.

That price decline suggests the Terrain has become more affordable for used buyers, but it also means future sellers may face a softer market if depreciation continues at the same pace. If you buy at a competitive price now, you can reduce the risk of being upside down later. Stronger-equipped trims and cleaner history examples should hold buyer interest better than rougher or less desirable configurations.

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?

It earns a four-star overall rating from NHTSA, with a three-star rating for rear seat, side-impact protection.

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

Standard Teen Driver technology and Rear Seat Reminder are included, which adds useful family-focused functionality. However, most driver-assistance and collision-avoidance systems are optional, and adaptive cruise control plus higher-speed automatic emergency braking are missing. The rear-seat side-impact result is the main caution for used shoppers, especially if you plan to carry passengers regularly.

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:

• 30.2% of listings are priced as good or great deals.
• At 61.3% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 9.69% compared with last year.
• Owners rate it 4.71/5 — a strong satisfaction signal.
• The 2018 stands out for its roomy cabin, available features, and stronger 2.0L turbo driving character, but its safety and value concerns remain part of the package.

The bottom line: If you want the 2018 Terrain specifically, it makes the most sense when you can find a clean, well-priced example with the right equipment and engine. If you’re price-sensitive, you should be especially selective and compare it against other years that may offer a better balance of safety, value, and overall polish.

These recommendations are based on CarGurus' proprietary market data from September 4, 2026, CarGurus experts' opinions, and generative AI.