St. Andrew's Preschool offers programs for 2 - 5-year-olds. The program for 2-year-olds meets two mornings a week, and takes a maximum of eight children per three staff members. The program for 3-year-olds also meets two mornings a week and takes a maximum of 18 children per three staff. The program for 4 and 5 -year-old children meets three mornings a week, and takes up to 20 children per three staffers.
The preschool is a non-profit program operated by the church, and follows the calendar of the Groton Public Schools.