2020 GMC Sierra prices in the U.S.
The median pre-owned asking price for a 2020 GMC Sierra in the U.S. is $35,899 based on 2,845 pre-owned listings (of 2,868 total).
As of September 8, 2026, the median asking price for a used 2020 GMC Sierra in the U.S. is $35,899, based on 2,845 active dealer listings tracked by VinAssessment.
◷ Updated September 8, 2026 ▤ 2,868 active dealer listings, refreshed daily ⛭ Generation: 2019–2021
Typical: $30,488–$41,777 — the middle half of 2,868 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 2020 GMC Sierra
The $30,488–$41,777 typical range isn't randomness — three factors explain most of it:
The same car typically asks $28,999 in Connecticut but $49,762 in New Hampshire.
Asking prices run about $48,616 under 15K miles and fall to $30,616 over 105K miles — roughly $1,700 for every 10,000 miles.
The SLE typically asks $28,539, while the Denali asks $43,296 — same year, same market.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 908 real asking prices, adjusted for mileage and location. Not a formal appraisal.
What would a 2020 GMC Sierra cost per month?
Estimate the monthly payment on a $43,296 vehicle. Move the numbers to match your own loan.
Estimate only. Excludes tax, title, registration and dealer fees, and assumes a fixed-rate loan with equal monthly payments. Your actual rate depends on your credit and lender.
2020 GMC Sierra: a fair price for your mileage
A 2020 GMC Sierra sheds roughly $1,700 for every 10,000 miles. Find your mileage below.
Fair price by mileage and trim
| Mileage | All listings | Denali | SLT | AT4 | Elevation | SLE |
|---|---|---|---|---|---|---|
| Under 15K miles | $48,616 | $62,248 | — | — | — | — |
| 15K–30K miles | $45,242 | $59,405 | $42,912 | $51,142 | $37,700 | — |
| 30K–45K miles | $43,997 | $57,072 | $39,987 | $43,713 | $34,990 | $34,597 |
| 45K–60K miles | $41,107 | $52,716 | $38,684 | $41,894 | $34,994 | $34,512 |
| 60K–75K miles | $38,195 | $41,246 | $36,295 | $39,899 | $32,906 | $30,995 |
| 75K–90K miles | $36,309 | $40,156 | $35,487 | $37,990 | $30,486 | $29,981 |
| 90K–105K miles | $34,130 | $43,592 | $32,995 | $36,201 | $29,098 | $28,997 |
| Over 105K miles | $30,616 | $39,972 | $29,496 | $32,990 | $27,364 | $23,995 |
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 | 12 listings | $48,616 | $48K–$54K |
| 15K–30K miles | 54 listings | $45,242 | $42K–$61K |
| 30K–45K miles | 131 listings | $43,997 | $39K–$57K |
| 45K–60K miles | 270 listings | $41,107 | $38K–$53K |
| 60K–75K miles | 405 listings | $38,195 | $35K–$41K |
| 75K–90K miles | 539 listings | $36,309 | $33K–$40K |
| 90K–105K miles | 501 listings | $34,130 | $31K–$39K |
| Over 105K miles | 952 listings | $30,616 | $27K–$36K |
Same trim and condition assumed — mileage is the biggest lever after configuration.
2020 GMC Sierra: price by trim
| Trim | Based on ⓘ | Median price ⓘ | Typical range ⓘ | Where it sits ⓘ |
|---|---|---|---|---|
| Denali | 908 listings | $43,296 | $37K–$53K | |
| SLT | 715 listings | $34,398 | $31K–$37K | |
| AT4 | 582 listings | $37,538 | $34K–$41K | |
| Elevation | 371 listings | $29,894 | $27K–$32K | |
| SLE | 198 listings | $28,539 | $25K–$33K |
Live 2020 GMC Sierra listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2019–2021 GMC Sierra listings on VehiSales →.
Price history
Median asking price by month · shaded band is the typical range (25th–75th percentile)
The median listing price for a 2020 GMC Sierra is $35,358 (September 2026) — up 1.1% from $34,990 in April 2026.
Monthly price table
| Month | Median price | Typical range | Vehicles listed |
|---|---|---|---|
| September 2026 | $35,358 | $30K–$41K | 400 |
| August 2026 | $35,461 | $30K–$42K | 577 |
| July 2026 | $35,989 | $30K–$43K | 597 |
| June 2026 | $36,234 | $30K–$43K | 338 |
| May 2026 | $36,244 | $30K–$43K | 74 |
| April 2026 | $34,990 | $30K–$43K | 91 |
2020 GMC Sierra prices by state
Listed this year counts every 2020 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.
Factory configurations of the 2020 GMC Sierra
239 factory configurations left the plant as a 2020 GMC Sierra — the most common are below, each decoded into its own build sheet from the VIN pattern.
- Denali 5.3L 8cyl 4WD $36,990
- Elevation 3L 6cyl 4WD 65 built
- SLE 6.6L 8cyl 4WD 72 built
- AT4 5.3L 8cyl 4WD $35,495
- Denali 6.2L 8cyl 4WD $37,825
- Fleet/Base 6.6L 8cyl 59 built
- Fleet/Base 5.3L 8cyl 4WD $25,998
- SLE 5.3L 8cyl 22 built
- SLE 5.3L 8cyl 4WD $28,313
- Denali 3L 6cyl 44 built
- Fleet/Base 6.6L 8cyl 4WD 145 built
- Fleet/Base 4.3L 6cyl 227 built
- Elevation 3L 6cyl 4WD $29,949
- SLE 5.3L 8cyl $29,598
- Fleet/Base 5.3L 8cyl 62 built
- SLE 6.6L 8cyl 4WD $41,398
- SLT 5.3L 8cyl 4WD $33,995
- AT4 6.6L 8cyl 4WD $44,750
- Elevation 2.7L 4cyl $25,454
- Fleet/Base 5.3L 8cyl 107 built
- Elevation 2.7L 4cyl $23,314
- Fleet/Base 5.3L 8cyl 31 built
- AT4 6.6L 8cyl 4WD 24 built
- SLT 3L 6cyl $31,998
Keep exploring Sierra prices
2020 GMC Sierra · $35,896 typical · 2,868 listingsOther GMC Sierra years
More 2020 GMC prices
Own a 2020 GMC Sierra? See what it's worth →
Frequently asked questions
Why do 2020 GMC Sierra prices range from $21,385 to $60,347?
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 $30,488 and $41,777 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2020 GMC Sierra?
Expect roughly $1,700 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $5,100 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
How many 2020 GMC Sierra are for sale right now?
2,868 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 2,868 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 reduce the influence of extreme values. This does not verify title status or guarantee that every erroneous listing is excluded. 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.
Want the original factory equipment and MSRP behind a specific car? See the factory window sticker for this Sierra →
Shopping for this car?
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.