Market price · Used 2015 GMC Sierra 1,899 listings tracked

Used 2015 GMC Sierra Price in the US

A used 2015 GMC Sierra in the US typically lists for $16,730–$26,314, with a median asking price of $20,964 across 1,899 active US dealer listings (as of 2026-10-17). The cheapest one listed right now is $5,995, a 2015 Fleet Base in Pocatello, ID — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

Used 2015 GMC Sierra · asking prices1,899 listings

median $21k ◀ cheapest $5,995

$10k$40k

Typical range: $16,730 – $26,314
Median: $20,964
Cheapest 5%: under $11,990
Cheapest listed now: $5,995

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More years (18)

Cheapest 10 listed right now

ranked by price

$5,995

2015 GMC Sierra Fleet Base

266,399 mi · Pocatello, ID · Oak Street Auto Brokers
View listing →
$6,498

2015 GMC Sierra SLE

209,593 mi · Little River, SC · Beach Chevrolet
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$6,650

2015 GMC Sierra Fleet Base

288,534 mi · Collinsville, OK · Green Country Auto Sales
View listing →
$6,900

2015 GMC Sierra SLE

261,945 mi · Waterloo, IA · C & S Car Company II
View listing →
$6,950

2015 GMC Sierra Fleet Base

255,440 mi · Mc Louth, KS · Courtney's Used Trucks
View listing →
$6,995

2015 GMC Sierra Fleet Base

160,281 mi · Portland, OR · 212 Auto Sales
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$6,995

2015 GMC Sierra Base

143,488 mi · Akron, OH · D&D Auto Group
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$7,435

2015 GMC Sierra SLE

288,701 mi · Fargo, ND · Corwin Public Wholesale
View listing →
$7,894

2015 GMC Sierra Fleet Base

154,803 mi · Windsor, ME · ASA Family Auto
View listing →
$7,900

2015 GMC Sierra Fleet Base

142,581 mi · Princeton, NC · LZ Auto LLC
View listing →

These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2015 GMC Sierra asks $16,730–$26,314. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.

FAQ

How much does a used 2015 GMC Sierra cost?

A used 2015 GMC Sierra in the US typically lists for $16,730 to $26,314, with a median asking price of $20,964 across 1,899 active US dealer listings. Nine in ten are priced between $11,990 and $38,900 (as of 2026-10-17, source: UnderMarket Cars).

Is $21,000 a good price for a used 2015 GMC Sierra?

That sits at about the market median ($20,964) for a used 2015 GMC Sierra. Under $16,730 puts you in the cheapest quarter of active US listings and under $11,990 in the cheapest 5%; above $38,900 is the priciest 5% (as of 2026-10-17).

What is the cheapest used 2015 GMC Sierra for sale right now?

$5,995 — a 2015 GMC Sierra Fleet Base in Pocatello, ID, $14,969 under the median (as of 2026-10-17).

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 2015 GMC Sierra page is regenerated from it when it is requested. The figures on this page are from 2026-10-17.

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Prices updated 2026-10-17. Data covers active dealer listings across the USA.