Mercer Slough Environmental Education Center


Polliwog Preschool

At Polliwog Preschool, nature ignites curiosity as children explore the living classroom of Mercer Slough Environmental Education Center in Bellevue. Polliwog Preschool is a school-year program for children ages 3-6 that builds a foundation for a lifelong love of science, nature, and learning.

Parents love Polliwog because of our commitment to hands-on learning, emphasis on social and emotional development, and small teacher-child ratio. Kids love us for the variety of fun and exciting ways we explore the world around us. As one of King County’s oldest nature preschools, we’ve built a reputation for excellence over the past eight years.


Polliwog Preschool registration is currently closed

Applications are not currently being accepted for the 2021-2022 school year. Sign up for the Families and Camps e-newsletter below to be notified with registration opens again.

Our Philosophy

Read about a typical day, meet our teachers, and learn why time in nature is so important for early learners.

Program Details

Get information about session times and tuition, find answers to frequently asked questions, and hear what other families have to say about us.

Visit Polliwog Preschool

Sign up for one of our monthly tours at Polliwog Preschool, or contact one of our teachers.



Early Childhood Explorations

Check out these fun ways for kids of all ages and families to investigate science. Inspire your early learner’s curiosity with hands-on activities, dynamic, touchable exhibits, opportunities to experiment, and of course learn.

Family and Camps e-Newsletter Sign-Up


Mercer Slough Environmental Education Center