  new trier high school (also known as new trier township high school or nths) is a public four-year high school, with its main campus for sophomores through seniors located in winnetka, illinois, us, and a freshman campus in northfield, illinois, with freshman classes and district administration. founded 
Educational_institutions_established_in_1901 Public_high_schools_in_Cook_County,_Illinois School_districts_in_Cook_County,_Illinois Winnetka,_Illinois