Our Programs

Academic programming

Three Rivers Montessori School offers an authentic Montessori education to families living in Elk River, surrounding communities, and those living within School District 728. Montessori Philosophy and environmentalism go hand-in hand, therefore the school will align its objectives with those of Elk River as a Green Step City since 2010, and with Osprey Wilds, to instill a connection and commitment to the environment through experiential learning.

Children’s House (Private Preschool ages 3-5)

We offer a fee based private preschool program. We are a DHS certified site and are Child Care Assistance Program (CCAP) eligible for families in Sherburne, Wright, and Hennepin Counties. For more information on CCAP you can reach out to the County with our provider number: 41862

A limited number of spaces are available each year. Please contact us to find out more!

K/1 Elementary (Kindergarten and 1st grade)

A limited number of spaces are available each year. Please contact us to find out more!

E1 Elementary (2nd and 3rd Grade)

A limited number of spaces are available each year. Please contact us to find out more!

E2 Elementary (4th through 6th Grade)

A limited number of spaces are available each year. Please contact us to find out more!

+ Before and After School Care

We offer convenient before and after school care programs. Please contact us for details.

Our Pathfinders before and after care programs are also CCAP eligible through Sherburne County. You can reach out to the County with our provider number of 41862 to apply for this benefit.

+ Extra Curricular Programs

+ TRM Testing and Assessments

NWEA Map Growth

  • TRM will be moving to the NWEA Map Growth assessment to check every student’s academic growth during the school year. This helps staff identify which individual students are meeting the academic standards per the child’s grade level (on track) and those children who may need supplemental interventions and instructional support to meet academic goals. Progress monitoring may also be used as an additional resource to set goals for learning growth. By utilizing progress monitoring teachers can quickly and frequently assess the academic performance of each student, get a clear measure of improvement and align Montessori instruction in real time.
  • Administered for all students K-6.


  • The Minnesota Comprehensive Assessments (MCAs) is a state-wide test utilized by each public/charter school to measure student progress toward Minnesota’s academic standards. The administration of this assessment meets federal and state legislative requirements. It is possible for students who receive special education services, and who meet eligibility requirements, to take an alternative assessment instead – the Minnesota Test of Academic Skills (MTAS)
  • 3rd-6th Graders will take Reading and Math; 5th graders will also take Science.


Fall Map Growth:

Reading (K-6) Week of Sept. 12th, 2023

Math (K-6) Week of Sept. 19th, 2023

Winter Map Growth:

Reading (K-6) Week of Jan. 8th, 2024

Math (K-6) Week of Jan. 16th, 2024

Spring Map Growth:

Reading (K-6) Week of April 15th, 2024

Math (K-6) Week of April 22nd, 2024


(3rd through 6th Grade)

Reading (3rd-6th): Week of April 15th, 2024

Math(3rd-6th): Week of April 22nd, 2024

Science (5th Grade only): Week of April 29th, 2024

ACCESS (for EL students)

Spring: Week of March 22nd, 2024

Pathfinders Childcare program

Three Rivers Montessori currently offers before and after-school childcare programming for our students. Before care runs from 6:30am to 7:00am and after care runs from 1:45pm to 6:00pm. You must pre-register to secure a spot for our Pathfinders before and after care program.

  1. Complete the online application.
  2. The Pathfinders Coordinator will respond within two (2) business days to verify your enrollment.
  3. Sign the Pathfinders Handbook.
  4. Complete the registration form.
  5. Submit payment before or same day of attendance.

Authorizer Information

TRM is authorized by Osprey Wilds. The authorizing mission of Osprey Wilds Environmental Learning Center is to ensure quality academic and environmental literacy outcomes for students in Minnesota by conducting effective oversight and evaluation of its authorized schools, providing strategic support to schools, and making informed and merit-based decisions about its portfolio of charter schools.



1730 NEW BRIGHTON BLVD SUITE 104, PMB 196 MINNEAPOLIS, MN 55413 (612) 331-4181


Experience why our children are HAPPY to learn!