Used 2018 GMC Sierra HD Price in the US
A used 2018 GMC Sierra HD in the US typically lists for $47,709–$50,024, with a median asking price of $48,762 across 4 active US dealer listings (as of 2026-09-01). The cheapest one listed right now is $46,298, a 2018 Denali in Grand Forks, ND — below 95% of the market, so expect an older model year, a base trim or high mileage.
Browse by model year
cheapest per year- All years
- 2026 · from $47,930
- 2025 · from $25,000
- 2024 · from $27,999
- 2023 · from $24,999
- 2022 · from $16,980
- 2021 · from $44,995
- 2020 · from $29,977
- 2019 · from $13,995
- 2018 · from $28,990
- 2017 · from $18,245
- 2016 · from $33,972
- 2015 · from $41,190
- 2013 · from $11,500
- 2012 · from $22,846
- 2011 · from $15,000
- 2009 · from $14,999
- 2005 · from $15,990
- 2001 · from $12,600
- 2000 · from $9,484
Cheapest 4 listed right now
ranked by price-
$46,2982018 GMC Sierra HD Denali97,397 mi · Grand Forks, ND · Rydell Chevrolet GMC of Grand ForksView listing → -
$48,1792018 GMC Sierra HD SLT80,585 mi · Baton Rouge, LA · Hollingsworth Richards FordView listing →
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$52,0612018 GMC Sierra HD Denali27,632 mi · South Jordan, UT · Jerry Seiner South Jordan GMCView listing →
These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2018 GMC Sierra HD asks $47,709–$50,024. Cars this far under usually carry an older model year, a base trim or high mileage.
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4 pinnedFAQ
How much does a used 2018 GMC Sierra HD cost?
A used 2018 GMC Sierra HD in the US typically lists for $47,709 to $50,024, with a median asking price of $48,762 across 4 active US dealer listings. Nine in ten are priced between $46,580 and $51,654 (as of 2026-09-01, source: UnderMarket Cars).
Is $49,000 a good price for a used 2018 GMC Sierra HD?
That sits at about the market median ($48,762) for a used 2018 GMC Sierra HD. Under $47,709 puts you in the cheapest quarter of active US listings and under $46,580 in the cheapest 5%; above $51,654 is the priciest 5% (as of 2026-09-01).
What is the cheapest used 2018 GMC Sierra HD for sale right now?
$46,298 — a 2018 GMC Sierra HD Denali in Grand Forks, ND, $2,464 under the median (as of 2026-09-01).
Are these MSRP or real asking prices?
Real asking prices from active US dealer listings, deduplicated by VIN — not manufacturer MSRP. They already reflect dealer discounts, and they exclude tax, title, registration and dealer fees.
How often are prices updated?
UnderMarket Cars refreshes US dealer listings continuously and re-generates this used 2018 GMC Sierra HD price page at least twice a day. The data date shown on this page is 2026-09-01.
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Prices updated 2026-09-01. Data covers active dealer listings across the USA.