Summary:
Monticello Montessori Charter School Inc. is a single-school charter district in Ammon, Idaho, serving grades PK through 8 at Monticello Montessori Charter School, a small elementary school with 185 students that earned a 1-star rating and ranked 76th out of 101 Idaho districts in the 2025-2026 school year.
The school stands out for its remarkably low chronic absenteeism rate of just 5.8% in 2025-2026, compared to the state average of 13.8%. This indicates a highly engaged student body and strong family-school connection, a hallmark of the Montessori model's emphasis on autonomy and parental involvement. English Language Arts is the school's relative strength, with 51.0% proficiency versus the state's 54.0%. Math and Science remain growth areas, at 30.2% and 34.8% proficiency respectively, compared to state averages of 43.1% and 42.7%. However, 7th-grade Math is a clear bright spot, with 45.5% proficiency beating the state's 43.6%, and Science proficiency improved dramatically from 22.7% to 34.8% year over year.
The district's rank has trended slightly downward, from the 25th percentile in 2023-2024 to the 22nd percentile in 2025-2026, though the 1-star rating has remained consistent. With a 20.6:1 student-teacher ratio and only 185 students, grade-level scores can fluctuate dramatically due to small cohorts; notably, 5th-grade Math and 8th-grade test scores were not reported despite the school serving those grades. Per-student spending from 2018-2019 was $6,869, though no current figure is available, and free/reduced lunch data is not reported, making socio-economic contextualization difficult. Overall, this Montessori charter offers an excellent attendance culture and a strong sense of community, but families should expect that standardized test performance in Math and Science lags state averages while ELA is more competitive.
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