2018 Gmc Terrain prices in the U.S.
The median pre-owned asking price for a 2018 Gmc Terrain in the U.S. is $14,990 based on 478 pre-owned listings (of 488 total).
As of July 25, 2026, the median asking price for a used 2018 Gmc Terrain in the U.S. is $14,990, based on 478 active dealer listings tracked by VinAssessment.
◷ Updated July 25, 2026 ▤ 488 active dealer listings, refreshed daily Methodology →
Typical: $12,950–$16,997 — the middle half of 488 asking prices
Why the wide range? Price depends mostly on configuration and mileage — see below. This spread covers the middle 96% of asking prices: we exclude the cheapest and priciest 2% (payment-priced ads, typos, salvage) so outliers don't distort it.
What moves the price on a 2018 Gmc Terrain
The $12,950–$16,997 typical range isn't randomness — three factors explain most of it:
Asking prices run about $19,119 at 30K–45K miles and fall to $12,295 over 105K miles — roughly $900 for every 10,000 miles.
The same car typically asks $12,594 in New Jersey but $18,144 in Idaho.
The SLE typically asks $13,784, while the Denali asks $17,343 — same year, same market.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 240 real asking prices, adjusted for mileage and location. Not a formal appraisal.
2018 Gmc Terrain: a fair price for your mileage
A 2018 Gmc Terrain sheds roughly $900 for every 10,000 miles. Find your mileage below.
Fair price by mileage and trim
| Mileage | All listings | SLE | SLT | Denali |
|---|---|---|---|---|
| 30K–45K miles | $19,119 | $17,440 | $20,830 | $21,271 |
| 45K–60K miles | $18,494 | $16,627 | $19,136 | $21,729 |
| 60K–75K miles | $17,251 | $15,996 | $17,912 | $19,280 |
| 75K–90K miles | $15,988 | $14,567 | $16,417 | $18,348 |
| 90K–105K miles | $15,368 | $14,240 | $15,415 | $17,354 |
| Over 105K miles | $12,295 | $11,661 | $13,068 | $14,123 |
Medians of live asking prices per band and version; “—” means fewer than 3 matching listings. National data.
Fair price by mileage — all versions combined
| Mileage ⓘ | Based on ⓘ | Fair price ⓘ | Typical range ⓘ |
|---|---|---|---|
| 30K–45K miles | 15 listings | $19,119 | $18K–$21K |
| 45K–60K miles | 27 listings | $18,494 | $16K–$20K |
| 60K–75K miles | 69 listings | $17,251 | $16K–$19K |
| 75K–90K miles | 84 listings | $15,988 | $14K–$17K |
| 90K–105K miles | 105 listings | $15,368 | $14K–$17K |
| Over 105K miles | 180 listings | $12,295 | $11K–$14K |
Same trim and condition assumed — mileage is the biggest lever after configuration.
2018 Gmc Terrain: price by trim
| Trim | Based on ⓘ | Median price ⓘ | Typical range ⓘ | Where it sits ⓘ |
|---|---|---|---|---|
| SLE | 240 listings | $13,784 | $12K–$16K | |
| SLT | 147 listings | $15,196 | $13K–$17K | |
| Denali | 101 listings | $17,343 | $16K–$19K |
Price history
Median asking price by month · shaded band is the typical range (25th–75th percentile)
The median listing price for a 2018 Gmc Terrain is $14,998 (July 2026) — down 6.2% from $15,995 in August 2025.
Monthly price table
| Month | Median price | Typical range | Vehicles listed |
|---|---|---|---|
| July 2026 | $14,998 | $13K–$17K | 638 |
| June 2026 | $14,994 | $13K–$18K | 750 |
| May 2026 | $14,995 | $13K–$17K | 786 |
| April 2026 | $14,990 | $13K–$17K | 736 |
| March 2026 | $14,956 | $13K–$17K | 862 |
| February 2026 | $14,848 | $13K–$16K | 816 |
| January 2026 | $14,795 | $13K–$17K | 723 |
| December 2025 | $14,859 | $13K–$17K | 543 |
| November 2025 | $14,900 | $13K–$17K | 434 |
| October 2025 | $15,690 | $14K–$18K | 488 |
| September 2025 | $15,995 | $14K–$18K | 387 |
| August 2025 | $15,995 | $14K–$18K | 454 |
2018 Gmc Terrain prices by state
Listed this year counts every 2018 Gmc Terrain first listed in 2026 (sold and active), with currently active cars as a floor. Typical price is the median of each car's latest asking price — or the average of active listings where this-year data is thin.
Keep exploring Terrain prices
2018 Gmc Terrain · $15,003 typical · 488 listingsOther Gmc Terrain years
Live 2018 Gmc Terrain listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2017–2019 Gmc Terrain listings on VehiSales →.
More 2018 Gmc prices
Frequently asked questions
Why do 2018 Gmc Terrain prices range from $8,994 to $21,761?
The spread comes down to configuration and mileage: higher-mileage, base-configuration examples sit near the low end, while low-mileage and premium configurations reach the top. Half of all listings fall between $12,950 and $16,997 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2018 Gmc Terrain?
Expect roughly $900 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $2,700 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
How many 2018 Gmc Terrain are for sale right now?
488 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 488 active listings for this vehicle across dealer sites nationwide, updated every day. Average and median are computed from real asking prices on live listings. We exclude the top and bottom 2% of prices to remove data errors, salvage titles, and monthly-payment figures posted as if they were sale prices. Prices reflect dealer asking prices — not final sale prices — and exclude taxes, fees, and incentives. Trim and mileage move the price more than any other factor; see the breakdowns above.
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