Get the ThunderRidge High School mobile app now! ThunderRidge High School is a public school, grades 9-12, located in Highlands Ranch, CO. Whether you are a student, parent, faculty member, or member of the Highlands Ranch community you will find helpful information in the ThunderRidge app. Download the app and start using it today.Here are just a few of the helpful features in the ThunderRidge High School mobile app:- Staff directory with contact information.- Click to call directory for the most popular school phone numbers. No more trying to remember what they actually are.- Get timely updates on school closures and events.- Easy access to all the sports schedules and calendars.- Easily connect to social channels and submit yearbook photos directly to staff members.