Challenger School has been inspiring children to achieve since 1963. Challenger School Middlefield is a Palo Alto private school with unmatched academic results. Our students scored in the top 10% nationally on the 2019 Iowa test. Start early and start right. Explore our preschool curriculum. We offer preschool year round from as early as 7 a.m. to 6 p.m. Our preschool programs are a surprisingly affordable alternative to daycare and can fit with your schedule. Children 2 years and 9 months or older are eligible for our preschool programs. Our Middlefield campus offers elementary school for kindergarten through eighth grade. Schedule a tour today to discover the Challenger difference. Conveniently located in Palo Alto, CA.