Catholic education has a long and rich history in Pierz and the surrounding communities of Buckman, Lastrup and Harding, beginning back in 1887. Three of the parishes, St. Michael of Buckman, St. Joseph of Pierz, and St. John Nepomuk of Lastrup had a Catholic school. Children from Holy Cross, Harding attended the school in Lastrup.
The Holy Trinity building was constructed between September, 1951 and August, 1952 for Fr. Pierz Memorial High School. The school provided a Catholic high school for the four parishes in Buckman, Pierz, Lastrup, and Harding. The high school opened in September 1952 with 174 students. The faculty consisted of eight Benedictine nuns, one layman, and the parish priests who taught religious classes. The gymnasium complex, built in 1958 and 1959, was first used in the 1958-59 school year. Fr. Pierz Memorial High School ceased operations in the spring of 1968 when the Pierz public high school was completed. The highest yearly enrollment was 388 students. 1047 students graduated from Fr. Pierz Memorial High School.
In 1990 Holy Trinity Catholic School became a legal, nonprofit corporation in the State of Minnesota as a result of the merger of three area Catholic schools: St. Michael's of Buckman, St. Joseph's in Pierz and St. John's in Lastrup (Holy Cross families desiring a Catholic education attended the Catholic school in Lastrup). Holy Trinity Catholic School provides education for children grades preschool through sixth grade.
The school employs an administrator, nine classroom teachers, preschool teacher, a before-after-school care director, specialists for library/technology, music and physical education, as well as, support staff members. Special education services are provided on campus through Pierz District 484.
The school is governed by a corporate board, which has nine voting members and an ex-officio member. Holy Trinity Catholic School is open to children in the Pierz community and surrounding area regardless of religious affiliation. Enrollment averages 170 students. Holy Trinity Catholic School is an accredited school in the State of Minnesota through MN Nonpublic Accrediting Association, MNSAA.