When will Rocket Lab Corporation launch Neutron? — Before March 2027

- [2026-01-21] Neutron's first-stage tank ruptured during a hydrostatic pressure (water-loading) qualification test at Wallops, pushing the debut from mid-2026 into "no earlier than Q4 2026." The first launch of the new Neutron rocket will take place no earlier than the fourth quarter of 2026, after an accident in January during testing of its fuel tank. https://universemagazine.com/en/no-earlier-than-late-2026-rocket-lab-postponed-the-first-flight-of-the-neutron-rocket/ - [2026-07-13/15] Rocket Lab completed a full-duration (~5.5 min) qualification static-fire of the Archimedes second-stage (vacuum) engine at Stennis Space Center. Rocket Lab completed a major qualification test for its formidable Archimedes engine at its Archimedes Test Complex at NASA's Stennis Space Center, with a full-duration test lasting just under 5.5 minutes. https://www.space.com/space-exploration/watch-archimedes-burn-rocket-lab-fires-up-engine-for-its-powerful-next-gen-neutron-launcher-video - [2026-08-10] In its Q2 2026 10-Q, Rocket Lab stated Stage 1 tank production is aligned with delivering Neutron to the pad in Q4 2026, but cautioned: "Production of the Stage 1 tank is currently aligned with the target delivery of Neutron to the launch pad in Q4 2026... While the window for an end-of-year launch date is narrowing, we are balancing the schedule of the first launch with entering Neutron into service as a system ready for full-scale production and high-cadence launch beyond flight one. Exact launch timing will also depend on the outcome of first stage qualification and other critical tests occurring later in 2026." https://www.sec.gov/Archives/edgar/data/0001819994/000181999426000062/rklb-20260630.htm - [2026-08-10] CEO Peter Beck called integrated static-fire testing at the Virginia pad the highest-risk remaining milestone: Asked about the milestone with the highest risk on the road to Neutron's debut, Beck said it would be the integrated static fire testing that will happen at the launch pad in Virginia, noting "the stage testing is always the thing that gets your adrenaline running because you have fully fueled vehicles on the pad." https://spaceflightnow.com/2026/08/10/window-for-2026-launch-debut-of-rocket-labs-neutron-rocket-is-narrowing-as-development-continues/ - [2026-08-10] Rocket Lab's Q2 earnings call reported over 400 Archimedes hot-fires completed and a full flight engine set in production, with the company still guiding toward pad delivery in Q4 2026. Neutron development is progressing well, with over 400 Archimedes engine hot fires completed, full engine set for the first launch in production, and the vehicle on track for pad delivery. https://www.gurufocus.com/news/9023202/rocket-lab-corp-rklb-q2-2026-earnings-call-highlights-record-revenue-iridium-acquisition-and-neutron-progress - [2026-08 (post-Q2, filing)] A subsequent SEC prospectus (424B5) reiterated: Several major vehicle structures have completed successful qualification and are moving into final integration and test phase, including the fairing, second stage, and thrust structure. An unanticipated failure during qualification testing of the first stage tank occurred in January 2026 and this has impacted the expected timing of Neutron's first launch. Based on our evaluation of necessary time to produce a new tank and complete robust testing... Neutron's first launch is now targeted for Q4 2026. However, risk and uncertainty remains in the complex development cycle of a new launch vehicle which could impact our current best estimate. https://www.sec.gov/Archives/edgar/data/1819994/000162828026018770/rocketlabcorporation-424b5.htm - [2026-08-10] Rocket Lab announced a dedicated Neutron launch contract for Kepler Communications targeted no earlier than 2028 to "deploy multiple satellites to low Earth orbit, expanding Kepler's constellation with additional optical connectivity, on-orbit compute, and hosted payload capacity ," underscoring that near-term manifest slots are being booked around an assumed 2026 debut. https://spaceflightnow.com/2026/08/10/window-for-2026-launch-debut-of-rocket-labs-neutron-rocket-is-narrowing-as-development-continues/ - [2026-09-23] Coverage framed Neutron's importance as filling the medium-lift gap as SpaceX shifts focus to Starship, noting the clearest proof point is Neutron's development and test flight timing relative to the expected easing of Falcon 9 availability after 2028 — implying no imminent launch has occurred yet. https://finance.yahoo.com/markets/stocks/articles/rocket-lab-rklb-neutron-could-201839880.html - [2026-09-27] Analyst summary confirms the debut is still pending: The bull case centers on Neutron, Rocket Lab's medium-lift reusable rocket, which is targeting a Q4 2026 inaugural launch at an average selling price of $50 to $55 million, with customers already booking full-price slots ahead of its first flight. https://www.foreignpolicyjournal.com/2026/09/27/rocket-lab-nasdaq-rklb-eyes-69-upside-as-neutron-launch-and-iridium-deal-define-its-next-chapter/ - [2026-09-30] Today's market commentary confirms Neutron has not yet launched: The primary catalyst is renewed investor focus on the Neutron rocket program, with a newly reported dedicated launch contract secured from Canadian telecom operator Kepler Communications... investors continue to watch closely for Neutron's anticipated fourth-quarter launch debut. https://investing.com/news/stock-market-news/why-is-rocket-lab-stock-rallying-today-93CH-4925419 - [2026-09-30 (site snapshot)] Rocket Lab's own Neutron product page still shows development in progress with no completed launch, listing remaining "Stage 1 Static Fire" as an upcoming milestone before flight. https://rocketlabcorp.com/launch/neutron/ BOTTOM LINE: As of September 30, 2026, Neutron has not yet launched; Rocket Lab's own SEC filings and public statements (through the Aug. 10, 2026 Q2 earnings call, reaffirmed in late-September media coverage) target a Q4 2026 first flight, with the company explicitly warning the end-of-year window "is narrowing" and remains contingent on completing first-stage qualification and integrated pad static-fire tests — key remaining technical hurdles that could still push the debut past the March 1, 2027 deadline. NOT FOUND: No confirmed date or announcement of Neutron's first stage arriving at Launch Complex 3, no completed integrated static fire (Stage 1) as of the latest reports, and no official slip of the target beyond Q4 2026/into 2027 has been announced by Rocket Lab itself (only third-party commentary speculating on possible slippage).

- [2021-03-01] Neutron was announced with an original target of first launch in 2024 — "The rocket was announced in development in early 2021 and initially expected to launch in 2024." - [2024-05-06] The schedule first slipped from "end of year" to "no earlier than mid-2025," with CEO Peter Beck noting there was no single technical showstopper, just "a whole bunch of stuff that just sort of adds up" — the company now projected a first launch no earlier than mid-2025, and Beck said the delay was not linked to a specific technical problem, "Just a whole bunch of stuff that just sort of adds up." - [2025-11-10] Slip #2: debut pushed from late 2025 into 2026, with the rocket to arrive at Launch Complex 3 in Q1 2026 "with first launch thereafter" — Sir Peter Beck announced the shift during the Q3 earnings call, saying the goal is to get the rocket to Launch Complex 3 within the first quarter of 2026 "with first launch thereafter." - [2026-01-21] A first-stage propellant tank ruptured during a hydrostatic pressure test at Middle River, Maryland, triggering slip #3 — Rocket Lab has provided limited technical detail since a first-stage propellant tank ruptured during a hydrostatic pressure test at the company's Space Structures Complex in Middle River, Maryland, on January 21, which pushed Neutron's debut from an already-slipped first-quarter target to no earlier than the fourth quarter of 2026, the second such delay in just over a year. - [2026-08-10] In its Q2 2026 SEC filing, Rocket Lab itself acknowledged the 2026 window is shrinking: the company noted it's working through various qualification testing and made "significant milestones across the Neutron program," writing "Production of the Stage 1 tank is currently aligned with the target delivery of Neutron to the launch pad in Q4 2026. While the window for an end-of-year launch date is narrowing... Exact launch timing will also depend on the outcome of first stage qualification and other critical tests occurring later in 2026." - [2026-08-10] The same filing headline was blunt: "Rocket Lab's anticipated debut of its medium-lift Neutron rocket may end up slipping beyond this year and into 2027." - [2026-08-10] Beck framed the program around not just flight one but reaching "flight ten" safely, indicating schedule is subordinate to reusability qualification rigor rather than a hard date — "it's not just to get to the pad quickly for flight one... it's really about how do we get to flight ten in the shortest time possible," Beck said, describing a constant trade-off between schedule and qualification criteria. - [2026-09-02] NASASpaceFlight reported Neutron's "Hungry Hippo" fairing completed testing, with Rocket Lab still targeting launch "by the end of this year," per the article's own description, though no firm date has been set. - [2026-08-10] Analogous first-flight slips are the norm across the industry: "First flight timeline slips are common across the launch industry. Falcon 9, New Glenn, Vulcan, and Ariane 6 each saw their debut flights pushed well past original targets." - [2026-05-07] Rocket Lab's own post-debut cadence plan (one launch year one, three year two, five year three) mirrors Electron's slow ramp, where Beck said they aim to replicate the Electron rollout by launching Neutron once during year one, three times during year two, and five times during year three, noting Electron completed 2025 with 21 launches after debuting in May 2017. - [Wikipedia, accessed 2026-09-30] An independently tracked milestone table lists "Launch" as "Not started" with target "NET 2027," reflecting outside observers' skepticism that a 2026 debut will hold — "NET 2027 | Launch | Not started" appears in the current development milestone table. BOTTOM LINE: The reference class of Neutron's own history is four consecutive slips (2024→mid-2025→late 2025→Q1 2026→Q4 2026, now "narrowing"/possibly 2027), and the broader reference class of first-flight new rockets (Falcon 9, New Glenn, Vulcan, Ariane 6) shows debut dates routinely slip past original targets by a year or more — both argue for meaningful base-rate skepticism that a "before March 2027" resolution occurs, even though Rocket Lab still nominally targets Q4 2026. NOT FOUND: No confirmed hard launch date, static-fire test date, or FAA/regulatory license approval date for Neutron's first flight; no Q3 2026 earnings call (likely in November 2026) content was available as it postdates current sources.

YES means: Rocket Lab successfully conducts Neutron's first launch (liftoff) between now and March 1, 2027. - [2026-09-02] Neutron's "Hungry Hippo" fairing has completed all testing and integration of key subsystems, with the company having performed hundreds of Archimedes engine hot-fires in preparation for Neutron's debut , and Rocket Lab is rapidly clearing milestones in the vehicle's development while still targeting a launch by year-end. - [2026-08-15] Beyond the fairing, multiple other subsystems are converging toward flight readiness: the full nine-engine set required for Neutron's maiden flight has entered production, and after qualification and acceptance testing, the engines will be shipped to Launch Complex 3 for integration. - [2026-08-15] Structural qualification is advancing in parallel: Stage 1 is in final assembly, while the interstage has completed its load-testing campaign and is moving into assembly, and the complete vehicle remains on track for delivery to the pad in the fourth quarter of this year. - [2026-08-15] The commercial manifest keeps growing around an assumed near-term debut: the rocket already carries a substantial manifest, including missions for the U.S. Space Force and the National Security Space Launch program, flights for seven undisclosed commercial customers, and a dedicated launch for Kepler Communications, the first time Rocket Lab has sold an entire Neutron flight rather than a rideshare. - [2026-09-28] Sell-side coverage remains constructive on near-term execution: Cantor Fitzgerald reaffirmed its "Overweight" rating and $122 price target on September 21, calling Neutron the "only viable alternative" to SpaceX's dominant Falcon 9 , implying analyst expectations for a 2026 debut remain intact even after the January tank failure. - [2026-09-24] Independent analytical modeling (rcspaceintelligence.com) frames the risk as sequencing rather than technical viability: the dominant issue is calendar risk rather than whether Neutron is technically credible; Stage 1 still must complete qualification following the January tank failure that already forced a major schedule revision — i.e., no unresolved design/engineering blocker, only schedule compression. - [2026-09-15] A comparative industry analysis (KeepTrack) still frames Q4 2026 as the operative target and expects near-term hardware delivery: we expect Neutron hardware to reach Launch Complex 3 before the end of 2026 , which — if realized — would leave roughly a full quarter of schedule margin (Oct/Nov/Dec 2026 plus January/February 2027) before the March 1, 2027 deadline for static fires, WDR, and the launch attempt itself. - [2026-08-15] Rocket Lab management has consistently reaffirmed the Q4 2026 pad-delivery target in successive public updates rather than walking it back to 2027, per the same filing language repeated in the Aug. 10 earnings call and 424B5 prospectus: production of Neutron's Stage 1 tank was "currently aligned with the target delivery of Neutron to the launch pad in Q4 2026," and exact launch timing will depend on first-stage qualification and other critical tests later this year. Notably, the company has not issued any formal announcement moving the target into 2027 (per mlq.ai's Sept. 15 analysis): Rocket Lab did not announce a formal 2027 delay. - [2026-08-10] Even the highest-risk remaining milestone — integrated pad static fire — is understood and staffed for, not an open design question: Beck described it as the point of maximum institutional caution rather than technical uncertainty, given the integrated static fire testing that will happen at the launch pad in Virginia... "the stage testing is always the thing that gets your adrenaline running because you have fully fueled vehicles on the pad and you're igniting the engines for the first time." - [2026-09-28] Market commentary frames Neutron progress as one of two coupled near-term catalysts (alongside Iridium integration) still expected to materialize this cycle, with analysts split on timing risk but not on technical feasibility: the market is crediting progress while discounting the possibility of delays… Cantor's thesis that the Iridium deal and Neutron progress are the key catalysts is plausible — but it assumes near-flawless execution on both fronts simultaneously. BOTTOM LINE: The strongest YES path is that Rocket Lab completes the remaining, well-defined, non-novel qualification steps (Stage 1 static fire, integration, WDR) within Q4 2026 as management still targets, leaving a multi-month buffer before the March 1, 2027 deadline even if the pad-delivery target itself slips modestly into November/December — no company statement has abandoned 2026, and the FAA/vehicle risk items are described as schedule risk, not open technical failure modes. NOT FOUND: No confirmed FAA Part 450 launch-license issuance date for Neutron; no confirmed date of Stage 1 arrival at Launch Complex 3 or of an integrated static fire; no Q3 2026 earnings call (expected ~November 2026) commentary, which would be the next scheduled update on pad-delivery timing.

YES means: Rocket Lab's Neutron rocket physically lifts off on its inaugural flight at any point after contract issuance and before March 1, 2027. - [2026-09-15] An independent industry analysis explicitly forecasts that Neutron's actual debut will land "in the first half of 2027, most likely in the second quarter," i.e. "The first launch, in our judgment, comes in the first half of 2027, most likely in the second quarter. We would be delighted to be wrong in December, and we do not think we will be." — a date that would fall after the March 1, 2027 deadline. https://keeptrack.space/deep-dive/rocket-lab-neutron-wallops - [2026-08-10] Even Rocket Lab's own SEC filing frames Q4 2026 as only a pad-delivery target, not a launch date, cautioning that "Delivery to the pad is not a launch." Between delivery and liftoff sits a lengthy gauntlet — "integrated stage testing, a wet dress rehearsal, a static fire, and the FAA license, a gauntlet that has consumed months for every clean-sheet vehicle of the past decade, and often the better part of a year, including for companies with more flight experience at this scale." https://keeptrack.space/deep-dive/rocket-lab-neutron-wallops - [2026-08-26 signal, reported 2026-09-15] A quiet but concrete schedule-slip indicator: in late August 2026, "Neutron's maiden flight dropped off the industry's dated launch schedule listings entirely," which the analysis calls "the bookkeeping that typically accompanies a mission without a committed window" — a fact not captured in prior reports. https://keeptrack.space/deep-dive/rocket-lab-neutron-wallops - [2026-08-15] A separate forecasting platform's aggregated probabilities for Neutron lifting off merely by Dec 31, 2026 (a full two months before this contract's March 1, 2027 deadline) were all low: RC Research's own view was 20%, the single recorded community forecaster put it at 5%, and two AI model assessments (GPT-5.6, Claude Opus) gave 27% and 8% respectively — none above 30%. https://www.rcspaceintelligence.com/forecasts/neutron-first-liftoff-2026 - [2026-08-15] The Opus-based assessment on that same page quantifies the remaining schedule risk numerically: "probability the vehicle is stacked at LC-3 by mid-November ≈ 35–40%; probability of liftoff by December 31 conditional on that ≈ 20–25%," implying roughly high-single-digit-to-low-teens percent odds of a 2026 liftoff even before accounting for further slip into 2027. https://www.rcspaceintelligence.com/forecasts/neutron-first-liftoff-2026 - [2026-08-15] That same analysis lists historical static-fire-to-debut intervals for new orbital vehicles as running "roughly 3–11 months" (citing Vulcan ~7 months, Ariane 6 ~8 months, New Glenn ~11 months), and notes Rocket Lab's own pacing item — first-stage qualification — is "precisely the one still unqualified" following the January tank rupture, implying that even a clean qualification this autumn could still push a static fire, and thus debut, past March 2027 under normal industry timelines. https://www.rcspaceintelligence.com/forecasts/neutron-first-liftoff-2026 - [2026-09-15] The KeepTrack piece frames CEO Peter Beck's own past statements as schedule-agnostic rather than deadline-driven, quoting his November 2025 remark that competitors "raced to the launch pad without being fully ready," and that "Neutron will fly when we're very confident it's ready" — corporate messaging consistent with further slippage rather than a hard commitment to any date, including March 2027. https://keeptrack.space/deep-dive/rocket-lab-neutron-wallops - [2026-09-15] The same source's own milestone timeline documents four consecutive schedule revisions from 2021 announcement through the January 2026 tank rupture, each pushing the debut later, reinforcing that the pattern of slippage has been consistent and multi-year, not a one-off. https://keeptrack.space/deep-dive/rocket-lab-neutron-wallops - [2026-09-15] Rocket Lab's own product page (accessed within the last month) still lists "Stage 1 Qualification," "Stage 1 Static Fire," and "Regulatory Approval For Launch" as pending items on its "Path to Lift-Off," with no static fire yet completed for the first stage, confirming multiple sequential gates remain before any launch attempt can occur. https://rocketlabcorp.com/launch/neutron/ BOTTOM LINE: Independent industry and forecasting analyses published in September 2026 — after the colleague reports' most recent inputs — converge on the view that Neutron's real debut is likely to slip beyond the Q4 2026 target and land in the first half of 2027, plausibly Q2 2027, i.e. after the March 1, 2027 deadline; even optimistic third-party probability estimates for a launch by Dec 31, 2026 alone cluster in the 5–27% range, and the remaining integration/static-fire/FAA gauntlet has historically taken many additional months beyond pad delivery for comparable new vehicles. NOT FOUND: No Q3 2026 Rocket Lab earnings call or SEC filing (expected around November 2026) was available to confirm or update the Q4 2026 target; no confirmed Stage 1 static-fire date or FAA launch license status as of this report's cutoff.