Limited Profile
Not enough data to generate a rating
Boulder Sudbury School
School
3800 PLATEAU RD, Longmont, CO 80503
Enrollment
25
Student-Teacher
8.3:1
Grades
UG – UG
Enrollment
25
Student-Teacher
8.3:1
Grades
UG – UG
Updated
2021-22
Updated 2021-22
About Boulder Sudbury School
Boulder Sudbury School is a private school in Longmont, CO 80503. The school serves approximately 25 students in grades UG – UG with a student-teacher ratio of 8.3:1. Located in a neighborhood with a median household income of $118,465, where 60% of adults hold a bachelor's degree or higher.
The school is situated in a fringe rural setting.
What Parents Should Know
With an enrollment of 25 students, Boulder Sudbury School is a smaller school where families often find a close-knit community atmosphere. Smaller settings can mean more individual attention from teachers and staff, though they may offer fewer extracurricular options than larger schools.
With a student-teacher ratio of 8.3:1, Boulder Sudbury School offers a notably low ratio compared to the national average. This typically means smaller class sizes and more opportunities for one-on-one interaction between students and teachers.
As a private school, Boulder Sudbury School operates independently from the local public school district. Families considering this school should inquire about tuition costs, financial aid availability, and the admissions process. Private schools are not required to follow the same curriculum standards as public schools, which can be either an advantage or a consideration depending on your priorities.
Financial Overview
Source: IRS Form 990 (2024 filing)
- Per-Pupil Spending
- Total expenses ÷ enrollment
- $7,025
- Per-Pupil Revenue
- Total revenue ÷ enrollment
- $6,316
- Financial Health
- Revenue-to-expense ratio (>1.0 = surplus)
- 0.90x — At Risk
- Tuition Dependency
- Share of revenue from program services (tuition, fees)
- 81%
- Total Assets
- End-of-year total assets from IRS filing
- $2.2M
Financial data from IRS Form 990 filings via ProPublica Nonprofit Explorer. Per-pupil figures based on current enrollment of 25 students. Not all private schools file Form 990.
Compare to Public Schools
BetaHow Boulder Sudbury School compares to 30 public schools serving similar grades in Longmont, CO
Student Demographics
Nearby Other Schools
| School | Rating |
|---|---|
| Boulder Sudbury School (this school) | — |
| Blue Mountain Elementary | 8.3 |
| Silver Creek High School | 7.6 |
| Altona Middle School | 5.2 |
| Eagle Crest Elementary School | 6.5 |
| Hygiene Elementary School | 8.1 |
| Westview Middle School | 6.4 |
| Longmont Estates Elementary School | 8.5 |
| Flagstaff Charter Academy | 7.6 |
| Sunset Middle School | 7.2 |
| New Meridian High School | 4.6 |
| St. Vrain Virtual High School | 8.2 |
| Indian Peaks Elementary School | 7.1 |
| Twin Peaks Charter Academy | 5.3 |
| Longmont High School | 7.1 |
| Burlington Elementary School | 5.6 |
| St. Vrain Community Montessori School | 6.7 |
| St. Vrain LaunchED Virtual Academy | 7.4 |
| Longs Peak Middle School | 5.8 |
| Central Elementary School | 8.5 |
| Mountain View Elementary School | 7.1 |
Showing 20 of 30 schools. View all schools in Longmont
Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.
School Profile
Limited Data- Grades
- UG – UG
- Enrollment
- 25 students
- Type
- Private
- Student-Teacher Ratio
- 8.3:1
- Address
- 3800 PLATEAU RD, Longmont, CO 80503
- Phone
- (720) 943-0918
- Data Year
- SY 2021-22
Why doesn't this school have a score?
We don't have enough verified data to rate this school fairly. Private schools in CO aren't required to report standardized test scores to the state, which limits the data available for our rating model.
Our rating model requires at least 2 of 4 data components (academics, student progress, college readiness, and resources) to generate a meaningful score. Schools below this threshold receive a Limited Profile to avoid misleading ratings.
Test Scores
Test score data not yet available for this school.
Student Demographics NCES PSS (SY 2021-22)
Source: NCES Private School Survey (PSS)
Location
3800 PLATEAU RD, Longmont, CO 80503
Nearby Alternatives
Families considering Boulder Sudbury School may also want to explore other schools in the area. SHINING MOUNTAIN WALDORF SCHOOL (rated 6.9/10, 5.3 miles away, in nearby Boulder). Additionally, HILLSIDE SCHOOL (rated 6.8/10, 5.9 miles away). For more schools in Longmont, see our Longmont schools guide .
Nearby Schools
20 within 5.6 mi| School | Distance | Rating |
|---|---|---|
| SHINING MOUNTAIN WALDORF SCHOOL Boulder | 5.3 mi | 6.9 |
| Crest View Elementary School Boulder | 5.4 mi | 7.9 |
| TARA PERFORMING ARTS HIGH SCHOOL Boulder | 5.5 mi | 7.3 |
| Lyons Middle/Senior High School Lyons | 5.8 mi | 6.9 |
| Centennial Middle School Boulder | 5.9 mi | 7.5 |
| JARROW MONTESSORI SCHOOL Boulder | 5.9 mi | 6.1 |
| Boulder Prep Charter High School Boulder | 5.4 mi | 8.0 |
| BOULDER COUNTRY DAY SCHOOL Boulder | 5.6 mi | 7.0 |
| Blue Mountain Elementary Longmont | 4.9 mi | 8.3 |
| BOULDER VALLEY WALDORF SCHOOL Niwot | 5.1 mi | 6.2 |
| JOSHUA SCHOOL-BOULDER Boulder | 5.6 mi | — |
| Foothill Elementary School Boulder | 6.6 mi | 8.2 |
| Lyons Elementary School Lyons | 6.7 mi | 8.4 |
| Columbine Elementary School Boulder | 6.7 mi | 7.8 |
| Silver Creek High School Longmont | 5.3 mi | 7.6 |
| MOUNTAIN SHADOWS MONTESSORI SCHOOL Boulder | 6.4 mi | 6.4 |
| HILLSIDE SCHOOL Longmont | 5.9 mi | 6.8 |
| Altona Middle School Longmont | 5.5 mi | 5.2 |
| WATERSHED SCHOOL Boulder | 7.2 mi | 5.9 |
| Eagle Crest Elementary School Longmont | 5.6 mi | 6.5 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 80503 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$118,465
Median Home Value
$704,800
Median Rent
$1,843/mo
Population
36,206
College Educated
60.2%
Homeownership
68.5%
Avg Commute
25.1 min
Poverty Rate
5.1%
Median Age
43.9
Community Profile
The community surrounding Boulder Sudbury School has a median household income of $118,465. It is a well-educated community where 60% of adults hold a bachelor's degree or higher. The median home value in the area is $704,800, with a median rent of $1,843/month. The local poverty rate of 5.1% is relatively low. The average commute for residents is 25 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| CEDAR WOOD Aurora, CO | — |
| CHRISTIAN GROWTH ACADEMY Pueblo, CO | — |
| CHRISTIAN GROWTH ACADEMY Pueblo, CO | — |
| DEVEREUX CLEO WALLACE CENTER Westminster, CO | — |
| EAGLE ROCK SCHOOL & PDC Estes Park, CO | — |
| Gateway School Gateway, CO | — |
Frequently Asked Questions
Common questions about Boulder Sudbury School
What grades does Boulder Sudbury School serve?
Boulder Sudbury School serves students in grades UG through UG.
How many students attend Boulder Sudbury School?
Boulder Sudbury School has an enrollment of approximately 25 students.
What is the student-teacher ratio at Boulder Sudbury School?
The student-teacher ratio at Boulder Sudbury School is 8.3:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.
Is Boulder Sudbury School a private school?
Yes, Boulder Sudbury School is a private coeducational school with a Nonsectarian affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.
Is Boulder Sudbury School a religious school?
No, Boulder Sudbury School is a nonsectarian (non-religious) private school.
Explore More Schools
Neighborhood Context
- City Safety
- High (3,112/100K)
FBI UCR 2024. City-level (Longmont). Data >1 year old.
Quick Facts NCES PSS (SY 2021-22)
- Grades
- UG – UG
- Enrollment
- 25
- Gender Split
- 56% M / 44% F
- Student-Teacher Ratio
- 8.3:1
- Teachers (FTE)
- 3
- Type
- private
- Coed Status
- coed
- Affiliation
- Nonsectarian
- School Day
- 8 hours
- Days Per Year
- 160 days
- Setting
- Fringe Rural
- County
- BOULDER
- Phone
- (720) 943-0918
- Data Year
- 2022–2023
Resources & Links
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
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