The countdown for artemis ii is underway at NASA’s Kennedy Space Center in Florida, with members of the launch team manning consoles inside the Rocco Petrone Launch Control Center as the first crewed test flight of the SLS rocket and Orion spacecraft targets liftoff at 6: 24 p. m. ET on Wednesday, April 1.
What If the final tanking and hardware checks proceed without issue?
Launch teams have begun procedural work aimed at readying ground and flight systems. Engineers are powering up flight hardware, checking communication links, and preparing cryogenic systems for the precise fueling sequence needed to load hundreds of thousands of gallons of super-cooled liquid hydrogen and liquid oxygen. At Launch Pad 39B, technicians will fill the sound suppression system’s massive tank so the protective water deluge is ready at liftoff. The Artemis II crew remains in Astronaut Crew Quarters inside the Neil A. Armstrong Operations and Checkout Building, completing medical checks while following a controlled sleep schedule and nutrition plan to maintain readiness.
- Countdown operations: Onsite clock began ticking at 4: 44 p. m. EDT toward the 6: 24 p. m. ET target.
- Ground preparations: Power-up, communications checks, cryogenic system activation, and pad sound suppression fill at Launch Pad 39B.
- Crew readiness: Quarantine, medical verification, hydration and sleep management in the Astronaut Crew Quarters.
- Operational oversight: Activities coordinated from the Rocco Petrone Launch Control Center.
What Happens When Artemis Ii Tanking Begins?
Tanking operations are the pivot point for launch day execution. The sequence will move from system power-up into propellant loading; engineers will manage the cryogenic transfer of super-cooled liquid hydrogen and liquid oxygen into the rocket’s tanks and monitor for any anomalies that could halt countdown progression. Weather monitoring by NASA and weather officers with the U. S. Space Force’s Space Launch Delta 45 is integral to the decision to proceed: the forecast for launch day shows an 80% chance of favorable conditions, with primary concerns cloud coverage and potential high winds. Broadcast coverage of tanking operations will begin with live views and audio commentary at 7: 45 a. m. ET on April 1, with extended coverage beginning at 12: 50 p. m. ET to track status leading into terminal count.
What Comes Next?
Mission leadership has held status briefings to align teams on readiness tasks. If tanking and final checks stay on track and weather remains within limits, the Launch Control Center will steer the sequence into terminal count and liftoff. If anomalies arise—technical, procedural, or meteorological—teams will execute predetermined hold and recycle procedures to protect crew and vehicle. For the crew—NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, alongside Canadian Space Agency astronaut Jeremy Hansen—the immediate priorities remain health monitoring and technical verification. Observers should expect continued public updates from mission control windows beginning in the morning and through the afternoon of launch day as teams confirm propellant load, communications integrity, and weather. The picture that emerges over the next hours will determine whether this first crewed SLS/Orion flight proceeds to liftoff or shifts into contingency timelines for the Artemis II
