When is the Artemis II rocket launch? NASA countdown test ahead

Wet Dress Rehearsal Underway as Artemis II Rocket Launch Nears Moon Mission

NASA’s historic Artemis II mission — the first crewed lunar‑flight test in over 50 years — is rapidly moving toward its launch window. Engineers at the Kennedy Space Center in Florida are currently conducting a vital wet dress rehearsal countdown for the Space Launch System (SLS) rocket and Orion spacecraft, as ground teams prepare for the spacecraft’s departure around the Moon in early February 2026.

Countdown Begins for Critical Prelaunch Test

On the eve of February 2, 2026, NASA initiated the wet dress rehearsal — a full fueling and countdown simulation designed to mirror actual launch day operations. This test exercises procedures such as loading cryogenic liquid propellant (liquid hydrogen and liquid oxygen) into the SLS rocket, running through the countdown sequence, and practicing scrub and restart scenarios without firing the rocket’s engines.

Fueling efforts for the rehearsal began after teams powered up key propulsion systems and mission support hardware amid challenging cold and windy weather at the launch site. The countdown and tanking activities are being livestreamed by NASA, providing real‑time insight into one of the most complex prelaunch milestones for Artemis II.

Launch Window and Weather Impacts

Originally planned for earlier in the week, the wet dress rehearsal was delayed due to rare sub‑freezing temperatures in Florida, which affected ground support operations. As a result, NASA adjusted the schedule, shifting the simulated countdown test to February 2 and opening the primary launch window beginning February 8, 2026.

The SLS rocket, standing 322 feet tall with the Orion crew capsule atop it, is poised on Launch Pad 39B at Kennedy Space Center. Teams are closely monitoring upcoming weather conditions, as the success of this wet dress rehearsal will be a major factor in affirming readiness for the crewed launch.

About the Artemis II Mission

Artemis II represents a watershed moment in human spaceflight. Following the success of Artemis I — an uncrewed lunar test flight — Artemis II will carry four astronauts farther into space than humans have traveled in more than half a century.

The crew includes:

• Commander Reid Wiseman (NASA)

• Pilot Victor Glover (NASA)

• Mission Specialist Christina Koch (NASA)

• Mission Specialist Jeremy Hansen (Canadian Space Agency)

During the mission’s roughly 10‑day duration, the team will orbit the Moon and return to Earth, gathering critical flight data on the crew capsule’s life‑support, navigation, and communication systems. Although the mission will not include a lunar landing, it is a necessary step toward returning humans to the lunar surface on Artemis III and future Artemis missions.

Next Steps for the Countdown

Once the wet dress rehearsal is successfully completed — including fueling operations, countdown holds, and procedural practice — NASA will evaluate the results to finalize the official launch date within the February 8–11 launch window. Additional backup windows are available in March and April if needed.

In parallel, the astronauts have completed quarantine at NASA facilities to ensure crew health and will relocate to Florida to conclude final mission preparations once the dress rehearsal is complete.

Why This Matters

Artemis II is not just a mission; it is a critical demonstration of human deep‑space travel capability — and it sets the stage for sustained lunar exploration and eventual missions to Mars. The wet dress rehearsal countdown currently underway brings NASA one step closer to achieving this milestone.