NASA has postponed the highly anticipated Artemis II mission around the moon due to an extreme cold snap at the Kennedy Space Center in Florida, affecting the rocket’s fueling schedule and overall launch timeline. Originally slated for early February, the mission is now expected to launch no earlier than 11:20 p.m. EST on February 8, 2026.

The decision comes as NASA conducts a critical dress rehearsal fueling test for the Space Launch System (SLS) rocket, which will carry the Artemis II crew on the first crewed lunar flight since the Apollo program. Engineers need to ensure the rocket’s systems can safely handle over 750,000 gallons of supercold liquid hydrogen and oxygen, despite the harsh winter temperatures impacting the launch pad.

Impact on Crew 12 Mission to ISS

NASA is simultaneously preparing Crew 12 for a mission to the International Space Station, replacing four astronauts who returned early on January 15 due to a medical issue with an unidentified crew member. The Crew 12 team—Commander Jessica Meir, Pilot Jack Hathaway, European Space Agency astronaut Sophie Adenot, and Cosmonaut Andrey Fedaev—was originally scheduled for a launch as early as February 11.

If Artemis II launches as planned on February 8, Crew 12 will be delayed until after the lunar mission concludes, potentially launching around February 19. Delays beyond February 11 for Artemis II could shift Crew 12’s mission as early as February 13, depending on final launch window availability. NASA officials emphasized that the Artemis II mission takes priority, and the two missions will not overlap unless an emergency requires a rapid ISS launch.

Artemis II Mission Details

The Artemis II mission will fly NASA astronauts Reid Wiseman, Victor Glover, Christina Koch, and Canadian astronaut Jeremy Hansen on a nine-day journey around the moon and back. This mission will demonstrate the SLS rocket’s performance with a crew onboard and prepare the way for a future landing near the lunar south pole in 2028.

“This is our second flight of the SLS rocket, and we’ve incorporated lessons learned from Artemis I to improve fueling procedures and address potential leaks or mechanical issues,” said Launch Director Charlie Blackwell-Thompson. “We are fully prepared for the wet dress rehearsal and remain confident in our ability to launch safely when conditions allow.”

The wet dress rehearsal involves fully loading the SLS rocket with cryogenic propellants, testing valves, plumbing, and umbilical connections under operational conditions. It is a critical step to ensure the rocket is ready for the actual lunar mission. The rehearsal countdown will begin at 8 p.m. EST Saturday, with fueling scheduled for 11 a.m. Monday, followed by a simulated launch window opening at 9 p.m.

Preparing for Contingencies

NASA’s Artemis II team has planned multiple “recycle” procedures to simulate unexpected issues during fueling and launch. The Artemis II rocket includes upgraded components and hardware from Artemis I to prevent past issues such as propellant leaks.

“The knowledge gained from Artemis I has been invaluable,” said Blackwell-Thompson. “We understand how to safely load liquid oxygen and hydrogen, and the lessons have been directly applied to Artemis II’s preparation.”

The Road Ahead

While the Artemis II launch faces weather-related challenges, NASA remains committed to keeping the schedule as tight as possible to maintain momentum toward future lunar landings and extended crewed missions. The agency continues to coordinate closely with SpaceX and international partners for the overlapping Crew 12 mission, ensuring a seamless transition to the International Space Station once the lunar crew returns.

NASA officials stress that safety remains the highest priority, and additional delays could occur depending on weather, rocket system checks, and overall mission readiness.