The Under-18 Series is a three-game series vs. Canada that features the U.S. Under-18 Women's Select Team. Twenty-three players are chosen to represent the U.S. following participation in the USA Hockey Women's National Festival. The series is held annually since 2007. Through 2025, the U.S. and Canada have met 16 times, playing 48 all-time games, at the Under-18 Series and Team USA holds a 16-4-5-26 (W-OTW-OTL-L) record.