Enrollment
375
Connecticut · 2024-25 NCES data
Elementary school (grades K-5) · Groton, CT
Catherine Kolnaski Magnet School
Federal NCES profile for Catherine Kolnaski Magnet School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 36/100.
2024-25 NCES dataElementary school (grades K-5)NCES 090177001494
👥 S:T ratio 53
🌟 Gifted program 30
📋 Attendance 26
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Catherine Kolnaski Magnet School earns 36/100 on the Resource Investment Index, with class sizes near the Connecticut median. It is also more racially and ethnically mixed than most Connecticut schools.
- #7 of 7
- public schools in Groton · Resource Index
- 36
- Resource Index · Typical
- 11.7:1
- students per teacher
- 45.5%
- free-lunch eligible
Catherine Kolnaski Magnet School has class sizes near the Connecticut median. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Catherine Kolnaski Magnet School ranks #7 of 7 public schools in Groton, CT.
School address
District: Groton School District · Connecticut
NCES ID 090177001494 Verify on NCES CCD record →
Teachers (FTE)
32.0
Federal CCD staff survey
Students per teacher
11.7:1
vs 12.1:1 Connecticut avg
-3% vs state
Free-lunch eligible
45.5%
vs 36.4% Connecticut avg
+25% vs state
Student-teacher ratio in context
How Catherine Kolnaski Magnet School compares with Connecticut and U.S. medians
What stands out at Catherine Kolnaski Magnet School
Catherine Kolnaski Magnet School is a mid-sized elementary school in Groton, Connecticut, enrolling 375 students.
At 11.7:1, its student-teacher ratio sits close to the Connecticut median, within a few percentage points of the 12.1:1 state norm, neither notably crowded nor notably small.
Economic need runs somewhat above the state's typical profile, with 45.5% of students eligible for free meals.
With 375 students, its enrollment sits close to the Connecticut median campus size.
Its Resource Investment Index lands in the lower third of 1,003 scored Connecticut schools.
Among 199 similarly sized, similarly resourced-need Connecticut schools statewide, it ranks #163, in the lower tier once campus size and economic need are matched.
Its student body is led by White (38%) and Hispanic or Latino (30%), more mixed than most schools in the state (diversity index 72/100).
Chronic absenteeism is elevated: 29.6% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Groton School District also operates Robert E. Fitch High School (942 students) and Groton Middle School (884 students) alongside Catherine Kolnaski Magnet 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 Catherine Kolnaski Magnet School compares
Catherine Kolnaski Magnet School on the metrics families compare, against Connecticut and U.S. means.
| Metric | This school | vs Connecticut | Connecticut avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 11.7:1 | ▼ 3% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 45.5% | ▲ 25% | 36.4% | 51.7% |
| Enrollment | 375 | top 57% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
11.7:1
Leaner classes than 78% of US schools, among the more generously staffed nationally.
375
Bigger than 44% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
45.5%
free-lunch eligible
- 25% above the Connecticut average of 36.4%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
11.7:1
students per teacher
- 3% below state mean
Top 52% in Connecticut - lower ratio than 48% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
29.6%
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
$23,574
per pupil, district-wide
- below Connecticut avg of $23,870
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
9
in-school suspensions + 1 out-of-school
Suspension rate: 2.4 per 100 students. Combined in-school and out-of-school rate: 2.7 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 38.4%
Hispanic or Latino 30.4%
Two or More 17.9%
Asian 8.0%
African American 4.8%
American Indian / Alaska Native 0.5%
Largest group: White at 38.4% of enrollment.
Student-body diversity index 71.9/100
Simpson diversity index - at 71.9, Catherine Kolnaski Magnet School is more mixed than the Connecticut school average of 50.5.
Programs
Funding & spending
District-wide per-pupil expenditure for Groton School District, which includes Catherine Kolnaski Magnet School.
$23,574
Per student
-1%
vs Connecticut
Avg $23,870
+42%
vs U.S.
Avg $16,593
Revenue mix
Local 48.5%
State 45.0%
Federal 6.5%
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 Catherine Kolnaski Magnet School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Robert E. Fitch High School | Larger | Lower economic need | Lower S:T ratio |
| Groton Middle School | Larger | Similar economic need | Similar S:T ratio |
| Mystic River Magnet School | Larger | Similar economic need | Similar S:T ratio |
| Thames River Magnet School | Larger | Similar economic need | Similar S:T ratio |
| Northeast Academy Magnet School | Similar size | Lower economic need | Similar S:T ratio |
Comparisons are relative to Catherine Kolnaski Magnet School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 942
- Students per teacher
- 9.9:1
- Resource Index
- 43/100
- Enrollment
- 884
- Students per teacher
- 11.5:1
- Resource Index
- 44/100
- Enrollment
- 520
- Students per teacher
- 12.7:1
- Resource Index
- 42/100
- Enrollment
- 501
- Students per teacher
- 11.7:1
- Resource Index
- 58/100
- Enrollment
- 392
- Students per teacher
- 12.6:1
- Resource Index
- 46/100
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of Connecticut, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~375 students)
Similar student-teacher ratio (~11.7:1)
Next steps
Verify locally before acting on Catherine Kolnaski Magnet School's federal record.
- Compare Catherine Kolnaski Magnet School against another school. Compare schools
- Groton School District'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 Catherine Kolnaski Magnet School
How many students attend Catherine Kolnaski Magnet School?
Catherine Kolnaski Magnet School has 375 students enrolled. It is an elementary school in Groton, CT.
What is the student-teacher ratio at Catherine Kolnaski Magnet School?
The student-teacher ratio at Catherine Kolnaski Magnet School is 11.7:1, which is 3% lower than the Connecticut average of 12.1:1 and 25% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Catherine Kolnaski Magnet School?
45.5% of students at Catherine Kolnaski Magnet School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Catherine Kolnaski Magnet School?
The largest demographic group at Catherine Kolnaski Magnet School is White at 38.4% of enrollment, in Groton, CT. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 71.9/100.
What is the Resource Investment Index for Catherine Kolnaski Magnet School?
Catherine Kolnaski Magnet School has a Resource Investment Index of 36/100 (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 Catherine Kolnaski Magnet School rank among public schools in Groton?
By Resource Investment Index, Catherine Kolnaski Magnet School ranks #7 of 7 public schools in Groton, CT. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Groton on the city page.
Is Catherine Kolnaski Magnet School a good school?
Catherine Kolnaski Magnet School earns 36/100 on the Resource Investment Index, with class sizes near the Connecticut median. It is also more racially and ethnically mixed than most Connecticut schools. 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 Groton School District?
Besides Catherine Kolnaski Magnet School, Groton School District also operates Robert E. Fitch High School (942 students), Groton Middle School (884 students), and Mystic River Magnet School (520 students). See the Groton School District 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.