Rocket Lab delays Neutron rocket debut to 2027

Rocket Lab has moved the debut launch of its Neutron rocket from late 2026 to 2027. The delay, the fourth schedule slip since the rocket's 2021 unveiling, stems from persistent manufacturing flaws in the vehicle's carbon composite forward dome.

Rocket Lab is not currently setting a new timeframe for the first launch. Instead, the company states that groundwork for a launch attempt should be complete by the end of the first quarter of 2027. After that, a firm target launch date will be provided. This marks a shift from August, when CEO Peter Beck said production lined up with a target delivery to the pad in the fourth quarter of 2026, while admitting the window for an end-of-year launch was narrowing.

Root cause traced to forward dome manufacturing flaws

The latest delay originates from a tank rupture during testing in January. That incident revealed a manufacturing defect in a handlaid tank built by a contractor. Rocket Lab subsequently moved production to an automated fiber placement machine. While the company had been successfully using this machine, it then uncovered air pockets between layers of carbon fiber in the propellant dome. Building a new forward dome on the automated fiber placement machine is already in progress. Composite tanks, where hidden defects can lurk in layered carbon fiber, are a common point of delay in launch schedules.

Quality and reliability prioritized over speed

Rocket Lab founder and CEO Peter Beck addressed the issue directly. He stated that the discovered defects did not necessarily mean the dome would fail in flight. However, he emphasized that possible success is not the company's standard. Beck said Rocket Lab's practice is to proceed only when the system has appropriate safety margins. The company is balancing speed to first launch with delivering a reliable, high-cadence rocket for the long term. Beck asserted that Neutron will be a big change and that taking time now ensures readiness for industry needs for years to come.

Market reacts sharply to schedule news

The investor update, disclosed on a Wednesday afternoon, triggered an immediate market reaction. Rocket Lab shares fell roughly 6% to 8% in after-hours trading. This continues a pattern where Neutron schedule news moves the company's stock more than almost any other single piece of information. The stock had already fallen 7.85% to close at $59.18 before the announcement, while the S&P 500 fell 1.07% in the same session. At an after-hours price of $53.30, the stock sits 64.7% below the top of its 52-week range.

Broader industry context and customer confidence

The delay comes as the launch market faces potential upheaval. Competitors like Firefly Aerospace and Blue Origin have warned customers the market is on the verge of a reset. SpaceX is reportedly preparing to wind down its Falcon 9 program to focus on Starship. Despite Neutron's delays, Beck alluded to unannounced new launch contracts. He noted that customers are choosing Neutron for multiple launches as part of long-term partnerships.

Rocket Lab has mitigated the air pocket issue with manufacturing fixes for the new forward dome. The replacement dome must now pass ultrasonic testing, which uses sound waves to detect internal flaws without cutting the part open. Next steps include this void testing, assembling the forward and aft domes, and conducting hydrostatic and cryo test campaigns. Rocket Lab expects these steps to be completed before and during the first quarter of 2027. After completing void testing, dome assembly, and test campaigns in Q1 2027, Rocket Lab will provide a new target launch date for Neutron.