Stepfamily Day The official date for National Stepfamily Day in the U.S., along with other countries who recognize it, is September 16. This day is designated as a time for step families to spend time together and for children to honor their stepparents. Happy Stepfamily Day Set a Reminder Enter your email address below to receive a reminder message. Email address Select the amount of Days before the event -- Select Days Before Event -- 1 Day 2 Days 3 Days 1 Week Submit Date and Time Thursday Sep 16, 2021 Set a Reminder Enter your email address below to receive a reminder message. Email address Select the amount of Days before the event -- Select Days Before Event -- 1 Day 2 Days 3 Days 1 Week Submit Share × Print Email Add to Calendar Facebook Twitter LinkedIn Tell a Friend × Select Calendar Type × Google Yahoo iCal (Outlook, Apple, or other)