September School
Boulder · CO · Private independent · K-12 combined
Similar nearby schools
Most similar nearby schools
Watershed School → Shining Mountain Waldorf School → Temple Grandin School → Joshua School-Boulder → Alexander Dawson School → Desiderata School → Devereux Cleo Wallace Center → Tara Performing Arts High School →How September School compares for families
What families should know about September School.
- ▸ LocallyCO students outperform the US average on NAEP 8th-grade math (+4 points).
- ▸ vs Similar SchoolsThe closest comparables nearby: Watershed School, Shining Mountain Waldorf School, Temple Grandin School and 5 more. See the sidebar to compare side-by-side.
For Parents
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🏛️ Your state's public flagship
University of Colorado Boulder
The in-state tuition gap is the flagship's biggest draw — most in-state families pay far less than the out-of-state sticker. Average net price after aid runs about $25,346/yr. Admission odds depend on your student's GPA and test scores, not which high school they attend.
Source: IPEDS admissions, tuition & enrollment + College Scorecard net price. Flagship = the state's primary public research university.
Enrollment trend & projection
Private school enrollment comes from the NCES Private School Universe Survey (PSS), which is collected every other year — not annually like public-school data. The most recent published collection is 2021–22; NCES targeted spring 2026 for the 2023–24 release — we'll load it as soon as it's published.
If the recent trend holds…
At its recent rate of +23.3%/year, projecting from 2022's 74 students:
An extrapolation of the recent trajectory, not a forecast of the school's plans; ignores one-off shocks.
Most similar nearby high schools
The schools most like this one — same type, blended on distance and size — and where their enrollment is heading. These are the schools families here weigh against each other.
| School | Type | Miles | HS enrollment | Trend |
|---|---|---|---|---|
| Watershed School Boulder |
Private | 1.6 | 111 | — |
| Shining Mountain Waldorf School Boulder |
Private | 3.0 | 199 | -19.4% |
| Temple Grandin School Boulder |
Private | 4.6 | 18 | — |
| Joshua School-Boulder Boulder |
Private | 7.2 | 18 | — |
| Alexander Dawson School Lafayette |
Private | 10.6 | 521 | +0.8% |
| Desiderata School Longmont |
Private | 12.7 | 18 | — |
| Devereux Cleo Wallace Center Westminster |
Private | 14.2 | 18 | — |
| Tara Performing Arts High School Boulder |
Private | 3.0 | 55 | — |