2018 Gmc Sierra 1500 prices in Texas
The median asking price for a 2018 Gmc Sierra 1500 in Texas is $24,974 based on 7 active listings.
As of July 26, 2026, the median asking price for a 2018 Gmc Sierra 1500 in Texas is $24,974, based on 7 active dealer listings tracked by VinAssessment.
◷ Updated July 26, 2026 ▤ 7 active dealer listings, refreshed daily Methodology →
Typical: $19,554–$30,989 — the middle half of 7 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 1500
The $19,554–$30,989 typical range isn't randomness — two factors explain most of it:
The Base typically asks $15,999, while the Denali asks $31,490 — same year, same market.
Asking prices run about $34,339 at 45K–60K miles and fall to $23,800 over 105K miles — roughly $1,800 for every 10,000 miles.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 67 real asking prices, adjusted for mileage and location. Not a formal appraisal.
2018 Gmc Sierra 1500: a fair price for your mileage
A 2018 Gmc Sierra 1500 sheds roughly $1,800 for every 10,000 miles. Find your mileage below.
Fair price by mileage and trim
| Mileage | All listings | Slt | Denali | Sle |
|---|---|---|---|---|
| 45K–60K miles | $34,339 | $34,465 | $32,894 | $31,990 |
| 60K–75K miles | $31,231 | $29,990 | $34,777 | — |
| 75K–90K miles | $29,912 | $30,648 | $31,285 | — |
| 90K–105K miles | $29,964 | $29,848 | $30,740 | $25,101 |
| Over 105K miles | $23,800 | $23,812 | $29,995 | $22,067 |
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 ⓘ |
|---|---|---|---|
| 45K–60K miles | 12 listings | $34,339 | $31K–$35K |
| 60K–75K miles | 8 listings | $31,231 | $30K–$34K |
| 75K–90K miles | 19 listings | $29,912 | $29K–$33K |
| 90K–105K miles | 24 listings | $29,964 | $28K–$30K |
| Over 105K miles | 50 listings | $23,800 | $20K–$27K |
Same trim and condition assumed — mileage is the biggest lever after configuration. National data; Texas prices track it closely.
2018 Gmc Sierra 1500: price by trim
| Trim | Based on ⓘ | Median price ⓘ | Typical range ⓘ | Where it sits ⓘ |
|---|---|---|---|---|
| Slt | 67 listings | $28,832 | $24K–$30K | |
| Denali | 21 listings | $31,490 | $30K–$34K | |
| Sle | 19 listings | $26,110 | $23K–$29K | |
| Base | 7 listings | $15,999 | $15K–$19K |
Based on a small number of listings per trim — medians are indicative, not definitive. National data; Texas prices track it closely.
Price history
Median asking price by month — national · shaded band is the typical range (25th–75th percentile)
The median listing price for a 2018 Gmc Sierra 1500 is $27,700 (July 2026) — down 4.5% from $28,996 in August 2025.
Monthly price table
| Month | Median price | Typical range | Vehicles listed |
|---|---|---|---|
| July 2026 | $27,700 | $24K–$31K | 1,635 |
| June 2026 | $27,754 | $24K–$31K | 2,012 |
| May 2026 | $27,495 | $24K–$31K | 1,993 |
| April 2026 | $27,500 | $24K–$31K | 1,821 |
| March 2026 | $27,492 | $24K–$31K | 2,264 |
| February 2026 | $26,990 | $24K–$30K | 2,164 |
| January 2026 | $26,978 | $23K–$30K | 2,149 |
| December 2025 | $26,979 | $23K–$30K | 1,799 |
| November 2025 | $27,200 | $24K–$30K | 1,351 |
| October 2025 | $27,995 | $25K–$32K | 1,186 |
| September 2025 | $28,900 | $25K–$32K | 1,054 |
| August 2025 | $28,996 | $25K–$33K | 1,100 |
2018 Gmc Sierra 1500 inventory across the U.S.
Keep exploring Sierra 1500 prices
2018 Gmc Sierra 1500 · $25,332 typical · 7 listingsOther Gmc Sierra 1500 years
Live 2018 Gmc Sierra 1500 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 1500 listings on VehiSales →.
More 2018 Gmc prices
Frequently asked questions
Why do 2018 Gmc Sierra 1500 prices range from $17,367 to $33,864 in Texas?
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 $19,554 and $30,989 — 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 1500?
Expect roughly $1,800 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $5,400 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
Do Gmc Sierra 1500 prices in Texas differ from the rest of the country?
Yes. The average in Texas is $25,332, which is $2,194 below the national average of $27,526. Local supply, demand and transport costs all play a part.
How many 2018 Gmc Sierra 1500 are for sale in Texas right now?
7 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 7 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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