Lowest Student–Teacher Ratio in Boulder (2025)
Schools with the fewest students per FTE teacher, among schools with at least 100 students. Ranked by the Success Index (US) from official American data; 24 schools in Boulder, Colorado. Rank positions shown on each profile are within United States and Colorado.
- 141Casey Middle SchoolBoulder · Public MiddleStudents per teacher: 13.0
- 266Whittier Elementary SchoolBoulder · Public ElementaryStudents per teacher: 13.5
- 372Flatirons Elementary SchoolBoulder · Public ElementaryStudents per teacher: 14.8
- 466Heatherwood Elementary SchoolBoulder · Public ElementaryStudents per teacher: 14.8
- 577Eisenhower Elementary SchoolBoulder · Public ElementaryStudents per teacher: 15.4
- 624Columbine Elementary SchoolBoulder · Public ElementaryStudents per teacher: 15.4
- 731University Hill Elementary SchoolBoulder · Public ElementaryStudents per teacher: 16.2
- 853Crest View Elementary SchoolBoulder · Public ElementaryStudents per teacher: 16.3
- 967Douglass Elementary SchoolBoulder · Public ElementaryStudents per teacher: 16.5
- 1079Mesa Elementary SchoolBoulder · Public ElementaryStudents per teacher: 16.7
- 1176Foothill Elementary SchoolBoulder · Public ElementaryStudents per teacher: 16.8
- 1276Boulder Community School/Integrated StudiesBoulder · Public ElementaryStudents per teacher: 17.0
- 1387High Peaks Elementary SchoolBoulder · Public ElementaryStudents per teacher: 17.1
- 1458Manhattan Middle School of the Arts and AcademicsBoulder · Public MiddleStudents per teacher: 17.2
- 1565Nevin Platt Middle SchoolBoulder · Public MiddleStudents per teacher: 17.3
- 1687Summit Middle Charter SchoolBoulder · Charter MiddleStudents per teacher: 17.4
- 1763Creekside Elementary School at Martin ParkBoulder · Public ElementaryStudents per teacher: 18.0
- 1865New Vista High SchoolBoulder · Public HighStudents per teacher: 18.2
- 1955Community Montessori SchoolBoulder · Public ElementaryStudents per teacher: 18.5
- 2084Bear Creek Elementary SchoolBoulder · Public ElementaryStudents per teacher: 18.7
- 2182Southern Hills Middle SchoolBoulder · Public MiddleStudents per teacher: 19.3
- 2257Centennial Middle SchoolBoulder · Public MiddleStudents per teacher: 19.9
- 2371Boulder High SchoolBoulder · Public HighStudents per teacher: 21.3
- 2480Fairview High SchoolBoulder · Public HighStudents per teacher: 23.3
| # | School | Sector | Students per teacher | Success Index (US) | Key result | Students |
|---|---|---|---|---|---|---|
| 1 | Casey Middle School Boulder · Middle · Grades 6–8 | Public | 13.0 | 41.3 Lower 50% | 34% Math proficiency | 363 |
| 2 | Whittier Elementary School Boulder · Elementary · Grades K–5 | Public | 13.5 | 65.7 Top 50% | 47% Math proficiency | 269 |
| 3 | Flatirons Elementary School Boulder · Elementary · Grades K–5 | Public | 14.8 | 71.8 Top 25% | 57% Math proficiency | 163 |
| 4 | Heatherwood Elementary School Boulder · Elementary · Grades PK–5 | Public | 14.8 | 66.2 Top 50% | 42% Math proficiency | 252 |
| 5 | Eisenhower Elementary School Boulder · Elementary · Grades PK–5 | Public | 15.4 | 77.4 Top 25% | 63% Math proficiency | 308 |
| 6 | Columbine Elementary School Boulder · Elementary · Grades PK–5 | Public | 15.4 | 24.1 Lower 50% | 23% Math proficiency | 369 |
| 7 | University Hill Elementary School Boulder · Elementary · Grades PK–5 | Public | 16.2 | 31.0 Lower 50% | 27% Math proficiency | 405 |
| 8 | Crest View Elementary School Boulder · Elementary · Grades K–5 | Public | 16.3 | 52.9 Top 50% | 45% Math proficiency | 390 |
| 9 | Douglass Elementary School Boulder · Elementary · Grades PK–5 | Public | 16.5 | 67.0 Top 50% | 59% Math proficiency | 313 |
| 10 | Mesa Elementary School Boulder · Elementary · Grades PK–5 | Public | 16.7 | 79.3 Top 25% | 62% Math proficiency | 250 |
| 11 | Foothill Elementary School Boulder · Elementary · Grades K–5 | Public | 16.8 | 76.1 Top 25% | 59% Math proficiency | 419 |
| 12 | Boulder Community School/Integrated Studies Boulder · Elementary · Grades K–5 | Public | 17.0 | 76.4 Top 25% | 67% Math proficiency | 255 |
| 13 | High Peaks Elementary School Boulder · Elementary · Grades K–5 | Public | 17.1 | 86.5 Top 5% | 82% Math proficiency | 257 |
| 14 | Manhattan Middle School of the Arts and Academics Boulder · Middle · Grades 6–8 | Public | 17.2 | 57.9 Top 50% | 42% Math proficiency | 482 |
| 15 | Nevin Platt Middle School Boulder · Middle · Grades 6–8 | Public | 17.3 | 65.2 Top 50% | 50% Math proficiency | 483 |
| 16 | Summit Middle Charter School Boulder · Middle · Grades 6–8 | Charter | 17.4 | 86.8 Top 5% | 82% Math proficiency | 366 |
| 17 | Creekside Elementary School at Martin Park Boulder · Elementary · Grades PK–5 | Public | 18.0 | 62.7 Top 50% | 52% Math proficiency | 359 |
| 18 | New Vista High School Boulder · High · Grades 9–12 | Public | 18.2 | 65.4 Top 50% | 37% Math proficiency | 327 |
| 19 | Community Montessori School Boulder · Elementary · Grades PK–6 | Public | 18.5 | 55.3 Top 50% | 42% Math proficiency | 277 |
| 20 | Bear Creek Elementary School Boulder · Elementary · Grades PK–5 | Public | 18.7 | 84.1 Top 10% | 80% Math proficiency | 318 |
| 21 | Southern Hills Middle School Boulder · Middle · Grades 6–8 | Public | 19.3 | 81.6 Top 10% | 68% Math proficiency | 502 |
| 22 | Centennial Middle School Boulder · Middle · Grades 6–8 | Public | 19.9 | 57.2 Top 50% | 46% Math proficiency | 598 |
| 23 | Boulder High School Boulder · High · Grades 9–12 | Public | 21.3 | 70.7 Top 25% | 66% Math proficiency | 1,939 |
| 24 | Fairview High School Boulder · High · Grades 9–12 | Public | 23.3 | 80.3 Top 10% | 79% Math proficiency | 1,863 |
Casey Middle School in Boulder leads the 2025 list of lowest student–teacher ratio in Boulder with Students per teacher 13.0. Of the 24 schools shown, 23 are public, 1 are charter.
For the full picture see the wider Colorado lowest student–teacher ratio rankings, every school on the Boulder page, or the comparison tool to put a shortlist side by side.
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Frequently asked questions
What is the best ratio school in Boulder?
Casey Middle School in Boulder, Colorado ranks first among lowest student–teacher ratio in Boulder with Students per teacher 13.0 (Enrollment: 363).
How are lowest student–teacher ratio in Boulder ranked?
Schools with the fewest students per FTE teacher, among schools with at least 100 students. Only schools eligible for the Success Index (US) are included; the index is shown alongside for context.
Are these 2025 rankings official?
No. They are computed by Success Tutoring from official American data (Urban Institute Education Data Portal (NCES CCD, EDFacts); NCES Common Core of Data). States set their own assessments and proficiency cut scores, so proficiency rates are most comparable within a state. Use the state rankings for like-for-like comparisons.