Used GMC Sierra 1500 for Sale near Helena, MT

Summary

• With 7,762 currently listed for sale on CarGurus and an average price of $35,263.80, 35.8% of 2020 GMC Sierra 1500s for sale on CarGurus are rated as good or great deals.
• Favorably reviewed: Owners rated the 2020 GMC Sierra 1500 4.7 / 5 stars and CarGurus experts gave it an 8.3 / 10.
• 76.3% of 2020 Sierra 1500 models on CarGurus are accident free.
• The 2020 GMC Sierra 1500 stood out for its high predicted reliability ratings from J.D. Power, ensuring peace of mind for buyers.

Why it stands out

The GMC Sierra 1500 stands out in the competitive full-size truck market with its blend of upscale design and practical features, making it a versatile choice for both work and family needs. Its fifth-generation model showcases innovations like the MultiPro Tailgate, which enhances cargo versatility, along with a range of powerful engine options that cater to various performance requirements. Additionally, the AT4 trim offers robust off-road capabilities while ensuring a comfortable ride, appealing to those who seek adventure without sacrificing everyday comfort.

Other model years to consider

For those considering the GMC Sierra 1500, the 2019 and 2021 model years present strong alternatives. The 2019 model offers an average price of $33,423.24, a user rating of 4.7/5, and a notable expert rating of 8/10, making it a cost-effective choice with great deal availability at 35%. The 2021 model, priced at $37,085.95 with a user rating of 4.9/5, also features solid deal opportunities at 35%, balancing slightly higher pricing with excellent consumer feedback.

Model years to approach with caution

When considering the GMC Sierra 1500, buyers should carefully evaluate the model years based on financial aspects, quality metrics, and availability constraints. The 2026 model has a significantly higher average price of over $64,000, with 62% of listings not qualifying as good or great deals, indicating potential financial concerns. In contrast, older models such as those from 2000 and 1998 offer strong user ratings of 4.5/5 but may also face limited availability, which could affect purchasing options for buyers seeking reliable quality at a more accessible price point.

These recommendations are based on CarGurus' proprietary market data from December 9, 2025, CarGurus experts' opinions, and generative AI.