General Motors is preparing one of its biggest pickup transitions in years, and the reported production sequence puts Mexico at the front of the line. The first next-generation 2027 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks are reportedly scheduled to begin regular production at GM’s Silao plant in Mexico on October 12, 2026, starting with Crew Cab models. What makes that schedule particularly notable in Canada is what it does not include: Oshawa Assembly. The Ontario plant currently builds light- and heavy-duty Silverados, yet it is absent from the latest reported light-duty rollout. That does not mean GM has officially confirmed the end of Silverado 1500 production in Oshawa. In fact, GM continues to invest heavily in the plant. The emerging picture is more complicated — and potentially points toward a major change in what kind of trucks Oshawa builds.
Mexico Gets the First Production Slot
The first regular-production examples of the next-generation Silverado 1500 and Sierra 1500 are currently slated to come from GM’s Silao Assembly plant in Mexico, according to production information reported by GM Authority. Crew Cab models are expected to lead the transition, with October 12, 2026 identified as the current start-of-regular-production date. Production schedules can change as tooling, supplier readiness and quality validation move through their final stages, so that date should be treated as a reported target rather than an immovable deadline.
The choice of Silao is less surprising than it may initially appear. The Mexican facility already produces both Silverado 1500 and Sierra 1500 trucks and has experience assembling Crew Cab models. The early production mix is also expected to emphasize GM’s new sixth-generation Small Block V8 engines. The redesigned trucks offer a new 5.7-litre V8 producing 402 horsepower and 428 lb.-ft. of torque, while the new 6.6-litre V8 reaches 481 horsepower and 501 lb.-ft. GM says the larger engine is the most powerful naturally aspirated V8 in its class. That gives the first trucks coming out of Silao considerably more significance than a routine model-year change.
The Rollout Will Be Staggered by Cab Style and Plant
GM is not expected to switch every Silverado and Sierra configuration to the new generation simultaneously. The reported schedule starts with Crew Cab trucks, while Regular Cab production is currently slated to begin on February 8, 2027. Double Cab production is expected to follow on April 12. That staggered rollout gives GM time to introduce different body configurations progressively rather than attempting to retool and validate the complete lineup at once.
Plant responsibilities are also expected to be divided. According to the current report, Silao will handle Regular Cab and Crew Cab production, while Fort Wayne Assembly in Indiana will produce Crew Cab and Double Cab trucks. Fort Wayne’s next-generation production is currently expected to begin in early 2027. GMC’s own product announcement supports the idea of a phased launch, noting that Regular Cab, Double Cab and additional configurations will become available as production expands. The first 2027 Sierra 1500s are expected at dealerships before the end of 2026. That makes the initial Silao Crew Cab run only the opening stage of a manufacturing transition that will continue well into 2027.
GM’s Public Announcements Stop Short of a Plant-by-Plant Schedule
There is an important distinction between what GM itself has announced and what industry reporting says about the production plan. Chevrolet has officially confirmed that the next-generation 2027 Silverado 1500 is expected to go on sale near the end of 2026, while GMC says its first redesigned Sierra 1500s should reach dealers before the end of the calendar year. GM has also confirmed the trucks’ engines, technology, configurations and most major specifications.
What GM has not publicly provided is the same detailed plant-by-plant timetable contained in the latest production reporting. Chevrolet’s launch material broadly states that the Silverado will be built at GM’s full-size truck assembly facilities in North America. GMC has similarly discussed the gradual expansion of configurations without publishing a public production calendar that identifies October 12 as Silao’s start date. That matters when discussing Oshawa. The Mexico-first schedule is based on reporting citing sources familiar with GM’s production plans. It should therefore be presented as credible current production reporting, not as a formal GM announcement that explicitly says Canada has been removed from Silverado 1500 production.
Oshawa’s Absence Is Significant — but It Is Not a Confirmed Exit
Oshawa’s omission from the latest light-duty production schedule immediately stands out because the plant currently builds the Chevrolet Silverado 1500. Earlier reporting indicated that GM could end light-duty Silverado production there with the outgoing generation, leaving the Ontario facility increasingly focused on heavy-duty trucks. AutoForecast Solutions was among the industry sources cited in reports anticipating that shift. GM, however, has stopped short of publicly confirming that the Silverado 1500 is leaving Oshawa.
When those reports surfaced in June, GM Canada said production locations for the next-generation Silverado 1500 had not been disclosed and pushed back against suggestions of a broader planned production scaleback at Oshawa. At roughly the same time, GM was publicly saying that the facility was preparing to build its next generation of gasoline-powered full-size pickups. The latest reported schedule therefore adds weight to the possibility that Oshawa will not participate in the new 1500 program, but it does not erase GM’s earlier statements. Until the company specifies Oshawa’s light-duty model allocation, the precise fate of Canadian-built Silverado 1500 production remains officially unresolved.
Oshawa Has Become a Major Silverado Operation Since Reopening
The uncertainty attracts attention partly because Oshawa has gone from a shuttered vehicle plant to a substantial pickup operation in only a few years. GM restarted vehicle production there in November 2021 after a rapid retooling program. At the time, the company said the reopening created approximately 1,800 jobs supporting two production shifts and would help meet strong North American demand for full-size pickups.
By June 2026, the facility had built more than 500,000 Chevrolet Silverado trucks since its reopening. GM also reported that Oshawa had produced more than one million aftermarket parts during that period. Before the next-generation transition, the plant held a particularly unusual position in GM’s manufacturing network: it was the company’s only North American facility building both light-duty and heavy-duty Chevrolet Silverados on the same assembly line. GM’s February 2026 description of the site still listed both products. That history makes Oshawa’s absence from the reported 2027 Silverado 1500 rollout more consequential than a routine reshuffling between factories. Light-duty production became a central part of the plant’s revival.
Oshawa’s Future Is Becoming Much More Clearly Tied to Heavy-Duty Trucks
Even if the next Silverado 1500 ultimately disappears from Oshawa, the plant is not being written out of GM’s pickup strategy. Quite the opposite is happening on the heavy-duty side. In August, GM Canada announced an additional C$144 million investment that will bring next-generation GMC Sierra Heavy-Duty production to Oshawa. The company said the move will allow the facility to build both of GM’s next-generation heavy-duty pickups: the Chevrolet Silverado HD and GMC Sierra HD.
That commitment builds on C$343 million already earmarked for next-generation truck production and manufacturing upgrades at Oshawa. GM puts total planned investment in the plant at nearly C$500 million when those programs are combined. Unifor’s newly ratified agreement with GM also specifically identifies the return of next-generation Sierra HD production to Oshawa and locks earlier stamping and component investments into the contract. The emerging strategy therefore looks less like GM abandoning Canadian truck production and more like a possible specialization of Oshawa around higher-capability heavy-duty models, stamping, components and aftermarket work. That distinction is crucial when interpreting the missing Silverado 1500 allocation.
Canada Still Has a Major Role Under the Hood
Vehicle assembly is only one part of the economic footprint created by the new Silverado and Sierra. Ontario will also play a major role in producing their new engines. GM Canada is investing C$691 million in St. Catharines Propulsion to prepare the facility for sixth-generation Small Block V8 production. St. Catharines will join Flint Engine Operations in Michigan and Tonawanda Propulsion in New York as part of GM’s North American manufacturing network for the new engine family.
Those engines are central to the redesigned pickups. The new 5.7-litre V8 makes 402 horsepower and 428 lb.-ft. of torque, while the 6.6-litre produces 481 horsepower and 501 lb.-ft. The lineup also includes an enhanced 2.7-litre TurboMax producing 350 horsepower and 455 lb.-ft., plus the 3.0-litre Duramax diesel with 305 horsepower and 495 lb.-ft. All four are paired with 10-speed automatic transmissions. GM says its engineers expect to have accumulated more than 2.4 million kilometres of real-world validation on the new V8s by the time the trucks reach dealerships. So even if final light-duty assembly becomes concentrated outside Canada, important next-generation truck manufacturing work remains anchored in Ontario.
The Employment Stakes Make the Final Allocation Worth Watching
For workers in Oshawa, the unanswered light-duty question carries more weight than a line on a production spreadsheet. GM shifted the factory back to two shifts in February 2026, a move that placed approximately 500 employees on layoff. By August, Unifor said it represented about 2,750 members at the Oshawa operation. The new collective agreement includes a plan aimed at mitigating layoffs while also securing additional products and investment for Canadian facilities.
That leaves Oshawa entering the next truck cycle with two realities at once. The latest reported Silverado 1500 and Sierra 1500 launch schedule points to Silao and Fort Wayne rather than Ontario, creating a legitimate question about the future of light-duty assembly. At the same time, GM has formally committed hundreds of millions of dollars to Oshawa and confirmed that both next-generation Chevrolet and GMC heavy-duty pickups will be produced there. The most important development to watch now is not simply whether the first new trucks roll out of Mexico on October 12. It is whether GM ultimately confirms that Oshawa’s long-term role has shifted from building both light- and heavy-duty Silverados to becoming a more specialized heavy-duty truck operation.
