Enrollment
183
Colorado · 2024-25 NCES data
Elementary school (grades K-5) · Carbondale, CO
Ross Montessori School
Federal NCES profile for Ross Montessori School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 38/100.
2024-25 NCES dataElementary school (grades K-5)NCES 080002001913Charter school
👥 S:T ratio 44
🌟 Gifted program 70
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Ross Montessori School earns 38/100 on the Resource Investment Index, with class sizes near the Colorado median.
- #3 of 3
- elementary schools in Carbondale · Resource Index
- 38
- Resource Index · Typical
- 14.1:1
- students per teacher
- 183
- students enrolled
Ross Montessori School has class sizes near the Colorado median. Computed live against every Colorado school reporting to NCES.
By Resource Investment Index, Ross Montessori School ranks #3 of 3 elementary schools in Carbondale, CO.
School address
District: State Charter School Institute · Colorado
NCES ID 080002001913 Verify on NCES CCD record →
Teachers (FTE)
13.0
Federal CCD staff survey
Students per teacher
14.1:1
vs 16.6:1 Colorado avg
-15% vs state
Student-teacher ratio in context
How Ross Montessori School compares with Colorado and U.S. medians
What stands out at Ross Montessori School
Ross Montessori School is a mid-sized charter elementary school in Carbondale, Colorado, enrolling 183 students.
Class sizes run a bit leaner than typical: 14.1:1 puts it in the smaller third of Colorado schools by student-teacher ratio.
Enrollment of 183 puts it in the smaller third of Colorado schools by headcount.
Its Resource Investment Index lands in the lower third of 1,922 scored Colorado schools.
Its student body is led by White (55%) and Hispanic or Latino (39%) (diversity index 55/100).
Chronic absenteeism is elevated: 91.8% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding State Charter School Institute spends $10,869 per pupil, 33% below the Colorado average, a leaner-resourced district than most.
State Charter School Institute also operates The Pinnacle Charter School (1,905 students) and Academy of Charter Schools (1,887 students) alongside Ross Montessori School.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Ross Montessori School compares
Ross Montessori School on the metrics families compare, against Colorado and U.S. means.
| Metric | This school | vs Colorado | Colorado avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.1:1 | ▼ 15% | 16.6:1 | 15.7:1 |
| Enrollment | 183 | top 78% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.1:1
Leaner classes than 56% of US schools, a middle-of-the-pack class size.
183
Bigger than 18% of US schools by enrollment, a small campus.
Equity indicators (what these measure)
Staffing depth
14.1:1
students per teacher
- 15% below state mean
Top 33% in Colorado - lower ratio than 67% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
91.8%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$10,869
per pupil, district-wide
- below Colorado avg of $16,273
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 2 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 1.1 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 54.6%
Hispanic or Latino 38.8%
Two or More 2.7%
African American 2.2%
Asian 1.1%
American Indian / Alaska Native 0.5%
Largest group: White at 54.6% of enrollment.
Student-body diversity index 55.0/100
Simpson diversity index - at 55.0, Ross Montessori School is more mixed than the Colorado school average of 47.1.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for State Charter School Institute, which includes Ross Montessori School.
$10,869
Per student
-33%
vs Colorado
Avg $16,273
-34%
vs U.S.
Avg $16,593
Revenue mix
Local 8.8%
State 81.0%
Federal 10.1%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Ross Montessori School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| The Pinnacle Charter School | Larger | No free-lunch data | Higher S:T ratio |
| Academy of Charter Schools | Larger | No free-lunch data | Higher S:T ratio |
| Colorado Early Colleges Douglas County | Larger | No free-lunch data | Higher S:T ratio |
| Colorado Early Colleges Fort Collins | Larger | No free-lunch data | Higher S:T ratio |
| Thomas Maclaren State Charter School | Larger | No free-lunch data | Lower S:T ratio |
Comparisons are relative to Ross Montessori School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,905
- Students per teacher
- 16.7:1
- Resource Index
- 32/100
- Enrollment
- 1,887
- Students per teacher
- 20.5:1
- Resource Index
- 22/100
- Enrollment
- 1,035
- Students per teacher
- 25.2:1
- Resource Index
- 49/100
- Enrollment
- 971
- Students per teacher
- 18:1
- Resource Index
- 52/100
- Enrollment
- 927
- Students per teacher
- 12.4:1
- Resource Index
- 47/100
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of Colorado, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~183 students)
Next steps
Verify locally before acting on Ross Montessori School's federal record.
- Compare Ross Montessori School against another school. Compare schools
- State Charter School Institute's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Ross Montessori School
How many students attend Ross Montessori School?
Ross Montessori School has 183 students enrolled. It is an elementary school in Carbondale, CO.
What is the student-teacher ratio at Ross Montessori School?
The student-teacher ratio at Ross Montessori School is 14.1:1, which is 15% lower than the Colorado average of 16.6:1 and 10% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Ross Montessori School?
The largest demographic group at Ross Montessori School is White at 54.6% of enrollment, in Carbondale, CO. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 55.0/100.
What is the Resource Investment Index for Ross Montessori School?
Ross Montessori School has a Resource Investment Index of 38/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Ross Montessori School rank among elementary schools in Carbondale?
By Resource Investment Index, Ross Montessori School ranks #3 of 3 elementary schools in Carbondale, CO. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Carbondale on the city page.
Is Ross Montessori School a good school?
Ross Montessori School earns 38/100 on the Resource Investment Index, with class sizes near the Colorado median. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in State Charter School Institute?
Besides Ross Montessori School, State Charter School Institute also operates The Pinnacle Charter School (1,905 students), Academy of Charter Schools (1,887 students), and Colorado Early Colleges Douglas County (1,035 students). See the State Charter School Institute district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.