On what date did the first all-female spacewalk occur from the ISS?

The first all-female spacewalk from the ISS occurred on October 18, 2019.

NASA astronauts Christina Koch and Jessica Meir performed the historic excursion during Expedition 61. Their spacewalk lasted 7 hours and 17 minutes, from October 18 into the same day’s UTC schedule, and focused mainly on replacing a failed battery-charge component and completing other station maintenance.

The event was significant because women had previously taken part in spacewalks, but no two-woman spacewalking team had yet worked outside the ISS together. Koch and Meir’s mission corrected that milestone without being staged as a symbolic demonstration: it was part of a larger sequence of battery-upgrade spacewalks needed to modernize the station’s power system.

The date is sometimes confused with January 25, 2020, when Koch and Meir completed another spacewalk together. That later excursion was also an all-female spacewalk, but it was not the first. Their October mission belongs to the period when Expedition 61 was commanded by ESA astronaut Luca Parmitano.