Used 2018 GMC Sierra HD Price in the US
A used 2018 GMC Sierra HD in the US typically lists for $29,721–$40,174, with a median asking price of $34,947 across 2 active US dealer listings (as of 2026-10-04). The cheapest one listed right now is $24,494, a 2018 Sle in Logan, UT — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.
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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 $29,721–$40,174. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.
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2 pinnedFAQ
How much does a used 2018 GMC Sierra HD cost?
A used 2018 GMC Sierra HD in the US typically lists for $29,721 to $40,174, with a median asking price of $34,947 across 2 active US dealer listings. Nine in ten are priced between $25,539 and $44,355 (as of 2026-10-04, source: UnderMarket Cars).
Is $35,000 a good price for a used 2018 GMC Sierra HD?
That sits at about the market median ($34,947) for a used 2018 GMC Sierra HD. Under $29,721 puts you in the cheapest quarter of active US listings and under $25,539 in the cheapest 5%; above $44,355 is the priciest 5% (as of 2026-10-04).
What is the cheapest used 2018 GMC Sierra HD for sale right now?
$24,494 — a 2018 GMC Sierra HD Sle in Logan, UT, $10,453 under the median (as of 2026-10-04).
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?
The listing data behind UnderMarket Cars is rebuilt from live US dealer inventory every few hours, and this used 2018 GMC Sierra HD page is regenerated from it when it is requested. The figures on this page are from 2026-10-04.
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Prices updated 2026-10-04. Data covers active dealer listings across the USA.