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Used truck, 2018
Live market data and proprietary AI-powered price forecasting for the 2018 GMC Sierra 1500 SLT. Updated weekly from thousands of active listings.
Current median price
$26,841
1,227 active listings
60-day forecast
$26,989
AI-predicted median
Expected change
+0.6%
vs. today
Confidence
74%
forecast confidence
Median days on market
154 days
last 90 days, n=2,595 listings
How 2018 GMC Sierra 1500 is tracking: CarCast forecasts a +0.6% move over the next 60 days. The broader used-car market is down 0.6% year-over-year (MUVVI) and down 1.5% on the consumer price index.
Median asking prices aggregated weekly from active dealer and auction listings.
We refresh the 2018 GMC Sierra 1500 SLTforecast every Sunday. We'll email you a short update whenever the median moves more than $500 or 2%.
| Week ending | Low (P10) | Expected (P50) | High (P90) |
|---|---|---|---|
| Nov 1, 2026 | $25,874 | $26,860 | $27,568 |
| Nov 8, 2026 | $25,646 | $26,897 | $27,766 |
| Nov 15, 2026 | $25,544 | $26,954 | $27,954 |
| Nov 22, 2026 | $25,446 | $26,989 | $28,090 |
| Nov 29, 2026 | $25,254 | $26,954 | $28,167 |
| Dec 6, 2026 | $25,090 | $26,942 | $28,282 |
| Dec 13, 2026 | $24,990 | $26,965 | $28,387 |
| Dec 20, 2026 | $24,885 | $26,989 | $28,515 |
Our model expects prices to stay roughly flat over the forecast window.
CarCast's AI-powered forecasting combines live listing prices, historical trends, regional economic indicators, and search-interest data to project where used car prices are heading. Informational analytics only — not financial advice.
Forecasts and trend classifications are informational analytics only and do not constitute financial advice or a recommendation to purchase, hold, or sell any vehicle. Individual market conditions vary.
2025 · truck
2025 GMC Sierra 1500 SLT
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2024 · truck
2024 GMC Sierra 1500 SLE
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2023 · truck
2023 GMC Sierra 1500 SLE
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2022 · truck
2022 GMC Sierra 1500 SLE
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2021 · truck
2021 GMC Sierra 1500 SLE
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2020 · truck
2020 GMC Sierra 1500 SLE
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The forecast on this page is the public 30-day median. Dealer is $199/mo for a full lot. A 90-day forecast is not published.