Girl Scouts Founders Day is observed worldwide every October 31 to honor Juliette Gordon Low, who founded the Girl Scouts of the USA in 1912. This date is significant as it also marks Low's birthday, having been born on October 31, 1860, in Savannah, Georgia. The celebration recognizes her contributions to the organization, which began with a troop of 18 girls and has since grown to include 3.7 million members nationwide. The movement's roots trace back to the Scout Movement initiated by Robert Baden-Powell in 1907, followed by the establishment of the Girl Guides by his sister Agnes in 1910. The first Girl Guide troop meeting in the United States took place on March 12, 1912, in Savannah. On Founders Day, Girl Scouts celebrate Low's legacy and the values she instilled in the organization.