2018 Gmc Sierra prices in the U.S.
The median pre-owned asking price for a 2018 Gmc Sierra in the U.S. is $27,995 based on 1,911 pre-owned listings (of 1,935 total).
As of July 25, 2026, the median asking price for a used 2018 Gmc Sierra in the U.S. is $27,995, based on 1,911 active dealer listings tracked by VinAssessment.
◷ Updated July 25, 2026 ▤ 1,935 active dealer listings, refreshed daily Methodology →
Typical: $23,618–$32,364 — the middle half of 1,935 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 Sierra
The $23,618–$32,364 typical range isn't randomness — three factors explain most of it:
The same car typically asks $18,500 in Kansas but $38,242 in Kentucky.
The SLE typically asks $23,900, while the Denali asks $33,520 — same year, same market.
Asking prices run about $32,653 under 15K miles and fall to $24,986 over 105K miles — roughly $700 for every 10,000 miles.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 1,057 real asking prices, adjusted for mileage and location. Not a formal appraisal.
2018 Gmc Sierra: a fair price for your mileage
A 2018 Gmc Sierra sheds roughly $700 for every 10,000 miles. Find your mileage below.
Fair price by mileage and trim
| Mileage | All listings | SLT | Denali | SLE |
|---|---|---|---|---|
| Under 15K miles | $32,653 | $32,653 | — | — |
| 15K–30K miles | $37,564 | $34,706 | $44,900 | $32,999 |
| 30K–45K miles | $36,566 | $36,584 | $39,092 | $28,950 |
| 45K–60K miles | $33,766 | $34,689 | $38,381 | $28,987 |
| 60K–75K miles | $33,509 | $33,334 | $36,294 | $26,872 |
| 75K–90K miles | $30,492 | $30,280 | $33,205 | $25,647 |
| 90K–105K miles | $29,813 | $29,647 | $31,989 | $24,124 |
| Over 105K miles | $24,986 | $24,900 | $30,049 | $19,950 |
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 ⓘ |
|---|---|---|---|
| Under 15K miles | 7 listings | $32,653 | $28K–$38K |
| 15K–30K miles | 16 listings | $37,564 | $33K–$44K |
| 30K–45K miles | 40 listings | $36,566 | $30K–$40K |
| 45K–60K miles | 89 listings | $33,766 | $29K–$38K |
| 60K–75K miles | 182 listings | $33,509 | $30K–$36K |
| 75K–90K miles | 272 listings | $30,492 | $28K–$33K |
| 90K–105K miles | 326 listings | $29,813 | $27K–$32K |
| Over 105K miles | 1,000 listings | $24,986 | $21K–$28K |
Same trim and condition assumed — mileage is the biggest lever after configuration.
2018 Gmc Sierra: price by trim
| Trim | Based on ⓘ | Median price ⓘ | Typical range ⓘ | Where it sits ⓘ |
|---|---|---|---|---|
| SLT | 1,057 listings | $27,823 | $24K–$31K | |
| Denali | 488 listings | $33,520 | $29K–$41K | |
| SLE | 203 listings | $23,900 | $20K–$27K |
Price history
Median asking price by month · shaded band is the typical range (25th–75th percentile)
The median listing price for a 2018 Gmc Sierra is $27,996 (July 2026) — up 12.1% from $24,969 in March 2026.
Monthly price table
| Month | Median price | Typical range | Vehicles listed |
|---|---|---|---|
| July 2026 | $27,996 | $23K–$33K | 408 |
| June 2026 | $28,092 | $23K–$34K | 312 |
| May 2026 | $25,944 | $22K–$34K | 92 |
| April 2026 | $25,999 | $22K–$32K | 114 |
| March 2026 | $24,969 | $22K–$32K | 108 |
2018 Gmc Sierra prices by state
Listed this year counts every 2018 Gmc Sierra 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 Sierra prices
2018 Gmc Sierra · $28,835 typical · 1,935 listingsOther Gmc Sierra years
Live 2018 Gmc Sierra listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2017–2019 Gmc Sierra listings on VehiSales →.
More 2018 Gmc prices
Frequently asked questions
Why do 2018 Gmc Sierra prices range from $14,995 to $50,062?
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 $23,618 and $32,364 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2018 Gmc Sierra?
Expect roughly $700 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $2,100 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 Sierra are for sale right now?
1,935 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 1,935 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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Check individual VINs before you buy — decode the exact trim and mileage, see every active listing, and how each price compares to the local market.