Prices starting at: $38,300

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Learn More About Buying a 2026 GMC Sierra 1500 in O'Fallon

Visit O'Fallon Buick GMC for a great deal on a new 2026 GMC Sierra 1500. Our sales team is ready to show you all of the features that you will find in the GMC Sierra 1500 and take you for a test drive in the O'Fallon Area. At our GMC dealership you will find competitive prices, a stocked inventory of 2026 GMC Sierra 1500 cars and a helpful sales team. Stop by our car dealership today and take a 2026 GMC for a spin.

2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 SLT

  • MSRP$70,155
  • Discount$6,000
  • Price$64,155
  • Offers$2,250
  • Final Price$61,905
  • Conditional Offers$4,500
Engine: 6.2L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black, Perforated leather-appointed front outb
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 Pro

  • MSRP$51,755
  • Discount$3,623
  • Price$48,132
  • Offers$3,250
  • Final Price$44,882
  • Conditional Offers$4,000
Engine: 5.3L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black, Cloth seat trim
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 Elevation

  • MSRP$61,060
  • Discount$6,000
  • Price$55,060
  • Offers$3,250
  • Final Price$51,810
  • Conditional Offers$4,000
Engine: 5.3L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Titanium Rush Metallic, Interior Color: Jet Black, Cloth seat trim
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 AT4

  • MSRP$74,085
  • Discount$6,000
  • Price$68,085
  • Offers$2,250
  • Final Price$65,835
  • Conditional Offers$3,500
Engine: 3.0L Duramax® Turbo Diesel engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated leathe
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 SLT

  • MSRP$67,665
  • Discount$6,000
  • Price$61,665
  • Offers$3,250
  • Final Price$58,415
  • Conditional Offers$4,000
Engine: 5.3L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black, Perforated leather-appointed front outb
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 Denali

  • MSRP$78,520
  • Discount$6,000
  • Price$72,520
  • Offers$2,250
  • Final Price$70,270
  • Conditional Offers$3,500
Engine: 3.0L Duramax® Turbo Diesel engine, Transmission: Automatic, Exterior Color: Titanium Rush Metallic, Interior Color: Jet Black, Forge perforated leather seat trim
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 AT4X

  • MSRP$84,385
  • Discount$6,000
  • Price$78,385
  • Offers$2,250
  • Final Price$76,135
  • Conditional Offers$4,500
Engine: 6.2L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Obsidian Rush, Full grain leather front seat trim
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 SLT

  • MSRP$71,300
  • Discount$6,000
  • Price$65,300
  • Offers$2,250
  • Final Price$63,050
  • Conditional Offers$4,500
Engine: 6.2L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Volcanic Red Tintcoat, Interior Color: Jet Black, Perforated leather-appointed front outb
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 Denali

  • MSRP$80,090
  • Discount$6,000
  • Price$74,090
  • Offers$2,250
  • Final Price$71,840
  • Conditional Offers$4,500
Engine: 6.2L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black, Forge perforated leather seat trim
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2026 GMC Sierra 1500 Truck

2026 GMC Sierra 1500 Denali Ultimate

  • MSRP$88,614
  • Discount$6,000
  • Price$82,614
  • Offers$2,250
  • Final Price$80,364
  • Conditional Offers$4,500
Engine: 6.2L EcoTec3 V8 engine, Transmission: Automatic, Exterior Color: Glacier White Tricoat, Interior Color: Alpine Umber, Full grain leather front seat trim
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View All New GMC Sierra 1500
2021 GMC Sierra 1500 Truck Crew Cab

2021 GMC Sierra 1500 SLT

  • Price$36,000
Engine: 5.3L EcoTec3 V8 engine, Transmission: Automatic, Mileage: 79,773 miles, Exterior Color: Ebony Twilight Metallic, Interior Color: Jet Black, Perforated leather-appointed front outb
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2023 GMC Sierra 1500 Truck Crew Cab

2023 GMC Sierra 1500 AT4

  • Price$48,600
Engine: 3.0L Duramax® Turbo Diesel engine, Transmission: Automatic, Mileage: 53,336 miles, Exterior Color: Volcanic Red Tintcoat, Interior Color: Jet Black with Kalahari accents, Perforated leathe
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2016 GMC Sierra 1500 Truck Crew Cab

2016 GMC Sierra 1500 Denali

  • Price$28,900
Engine: 6.2L Engine: , V-8, SIDI, Active Fuel Mgt, Transmission: Automatic, Mileage: 94,417 miles, Exterior Color: White Frost Tricoat, Interior Color: JET BLACK, PERFORATED LEATHER-APPOINTED FRONT SEAT
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View All Pre-Owned GMC Sierra 1500

GMC (1)

Sierra 1500 Truck (11)

2026

Manufacturer Offer

For Well-Qualified Buyers When Financed w/ GM Financial

  1. 0.0% APR for 36 months
  2. 2.9% APR for 48 months
  3. 5.9% APR for 60 months
  4. 5.9% APR for 72 months
  • Applies to this new 2026 GMC Sierra 1500

For Well-Qualified Buyers When Financed w/ GM Financial

Disclaimer(s)
  • 0.0% APR for 36 months for well-qualified buyers when financed w/GM Financial. Monthly payment is $27.78 for every $1000 you finance. Average example down payment is 10.0%. Not available with leases and some other offers. Must take new retail delivery by 03/31/2026. Truth in Lending Act Disclosure: Down payment will vary with APR and credit. For example, 0.0% APR with $2,500 down payment provides for 36 monthly payments of $27.78 per $1000 financed for qualified buyers. 2.9% APR for a term of 48 months corresponds to a monthly cost of $22.09 per $1000 financed. 5.9% APR for a term of 84 months corresponds to a monthly cost of $14.56 per $1000 financed. 5.9% APR for a term of 72 months corresponds to a monthly cost of $16.53 per $1000 financed. 5.9% APR for a term of 60 months corresponds to a monthly cost of $19.29 per $1000 financed. The rates described are for estimation purposes only; you may not be able to finance at this rate. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Purchase Allowance

  1. $1,750 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Not available with special financing, lease and some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Bonus Cash

  1. $1,750 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Not available with some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Bonus Cash

  1. $1,500 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Not available with some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Bonus Cash

  1. $500 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Not available with some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

SCR GMC Lease - Unrestricted

  • Applies to this new 2026 GMC Sierra 1500.

Ultra Low-Mileage Lease for Well-Qualified Lessees. $299/month for 24 months. For Current Lessees of 2021 model year or newer select GM vehicles : $4,239 due at signing (after all offers).** $0 security deposit. Tax, title, license, and dealer fees extra. Mileage charge of $0.25/mile over 20,000 miles at participating dealers.

Disclaimer(s)
  • **For Current Lessees of 2021 model year or newer Buick and GMC vehicles at least 30 days prior to the lease of a new GM vehicle through GM Financial : Each dealer sets own price. $299/month for 24 months. Your payments may vary. Payments are for a 2026 GMC Sierra 1500 Short Box Crew Cab 4WD Elevation w/TurboMax with an MSRP of $56,395. Based on due at signing amount of $4,239 (after all offers). 24 monthly payments total $7,176. Must show proof of lease. Option to purchase at lease end for an amount to be determined at lease signing. Lessor must approve lease. Take new retail delivery by 03-31-2026. Lessee pays for maintenance, repair, excess wear and disposition fee of $495 or less at end of lease. No security deposit required. Payments may be higher in some states. Not available with other offers. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Trade Assistance

  1. $3,500 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Must trade in a 2012 model year or newer vehicle. Not available with lease and some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Trade Assistance

  1. $3,000 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Must trade in a 2012 model year or newer vehicle. Not available with lease and some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Trade Assistance

  1. $2,500 Cash
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Must trade in a 2012 model year or newer vehicle. Not available with lease and some other offers. Must take new retail delivery by 03/31/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

GM First Responder Offer

  1. $500 Offer
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Must be a current Firefighter, Police, EMT/Paramedic, or 911 Dispatcher. First Responders employed by federal, state or municipal governments may be subject to restrictions that limit their ability to accept this offer. Accordingly, this offer is void unless permitted by applicable federal, state and municipal laws, regulations, rules, ordinances, policies, codes of conduct, and other directives or standards regarding ethics and gift acceptance by the applicable federal, state or municipal employees. By accepting this offer, you verify that doing so complies with all laws, regulations, policies or other restrictions regarding ethics or gift acceptance that apply to you. Eligible participants are able to sponsor their spouse. At participating dealers only. Visit gmfirstresponderappreciation.com for program eligibility details and for a list of eligible vehicles. Not available with some other offers. Must provide authorization number to participating dealer prior to or at time of vehicle delivery to receive offer. Must take new retail delivery by 01/04/2027. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

GM Military Offer

  1. $500 Offer
  • Applies to this new 2026 GMC Sierra 1500

Disclaimer(s)
  • Eligible military personnel includes Active Duty members, Reservists, National Guard members, Veterans and Retirees of the U.S. Army, Navy, Air Force, Marine Corps and Coast Guard. Eligible participants are able to sponsor their spouse. At participating dealers only. Visit gmmilitaryappreciation.com for program eligibility details and for a list of eligible vehicles. Not available with some other offers. Must provide authorization number to participating dealer prior to or at time of vehicle delivery to receive offer. Must take new retail delivery by 01/04/2027. (See Trims)
  • See State Disclaimer *

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Disclaimer: The Manufacturer’s Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Dealer sets final price.

1Dealer Discount applied to everyone