The school first opened in 1965. It was co-founded by Imogene "Gene" Powers Johnson, wife of Samuel Curtis Johnson Jr.; and Willie Hilpert, wife of Frank Hilpert. Initially the school founders intended to convert the 2300 Washington Ave. residence into a school facility and grow it at that site, but they could not overcome complying with building codes and conversion logistics, so a different site was chosen. Taliesin Associates designed the school buildings, with Charles Montooth as the lead designer of the original and subsequent buildings up to 2004. The school founders selected Taliesin's designs because they contrasted to other square/rectangular-based ones of the time; their other proposal from architects in Milwaukee, Wisconsin had the ordinary design. Johnson continued to serve as the director and chairperson of the school after its establishment. Michael Burke of The Journal Times described her as "one of the Racine community’s major benefactors". Samuel Curtis Johnson served as the school's Chairman of the Board until 1983, when he was named Founding Chairman Emeritus, a position he held until his death. By 2004 there had been ten additions to the school facility. John H. Mitchell was the first Headmaster. Mark Murphy served as the headmaster from 1993 until June 30, 2014. Nathaniel Coffman, previously the headmaster of the York Country Day School, became the new headmaster at that time.
Campus
The magazine Buildings described the campus as being "Frank Lloyd Wright-inspired". Imogene Johnson, one of Prairie's founders, was the wife of the eponymous head of SC Johnson corporation, based in Racine. The Johnson family and company commissioned many Wright buildings, such as their corporate headquarters Johnson Wax Headquarters, the Wingspread conference center very near the school, and others. The first building became the Middle School, and is a complete circle surrounding a small courtyard. The Lower and Upper School buildings were soon added, which are curved arcs attached to the Middle School by hallways. Other early additions included a small gymnasium, a circular cafeteria, and a teardrop-shaped art department with a second story for offices and small student workspaces with excellent lighting. Most Prairie School buildings are single story, made of brick, and colored red, and emphasize circles. With the exception of the field house, there are hallways connecting them. In 1969 the H.F. Johnson Fieldhouse opened. There was a $14 million planned addition, built circa 2004, added to the fieldhouse's north, with engineering done by Zimmerman Design Group and general contracting being done by Bukacek Construction. The addition includes a two-story atrium connecting it with the original building as well as basketball courts, a multipurpose room used for dance classes, a running track inside the building, and a weight room.
Athletics
The following sports are offered in the Upper School: Fall:
