The top reported proficiency rate is 45% in English language arts. The lowest is 44% in Math.
Original Research by School Decision on Sage International School Middleton Llc
Sage International School Middleton is a single-school charter district in Idaho serving kindergarten through tenth grade, with publicly reported plans to add eleventh grade in the current year and grow toward a full K through 12 span. The school sits in the Middleton area, though the available data did not include a locale brief or community context for the town, so we can describe the setting only in broad terms. What families do have is a clear academic identity: Sage is an authorized International Baccalaureate World School, offering the Primary Years Programme for elementary grades, the Middle Years Programme for grades six through ten, and now the Diploma Programme for the upper high school grades. This IB framework across all grade bands is the school's defining feature, and it is free and public, which the school's own materials describe as distinctive for the Middleton area.
The enrollment is small for a district spanning this many grades. Each grade cohort is modest, which means classmates and teachers know each other well, but it also means the testing pools are small. Several proficiency results came back as ranges rather than exact figures, a pattern that commonly reflects small tested groups and privacy protections rather than anything about academic quality. Where exact proficiency was reported, the picture is mixed but leans toward moderate. In math, third and fourth graders showed roughly half or just under half of tested students reaching proficiency, while sixth grade was lower and seventh grade returned to the mid-range. Fifth grade math landed in a lower band. English language arts followed a similar pattern, with fifth, sixth, and eighth grades showing moderate proficiency while several other grades appeared only as wide ranges. Science was tested in fifth and eighth grades, both reported as ranges, making it hard to read clearly. No state testing data was available for kindergarten through second grade, which is expected because those grades are not tested. No graduation rate applies yet because the school has not served a graduating senior class, though the IB Diploma Programme expansion means that will change soon.
The student body is predominantly white, with a sizable Hispanic population and small numbers of students from other racial and ethnic backgrounds. Economic indicators were not available; free and reduced-price lunch data, special education rates, and English learner counts were all missing from what we received. A parent may want to ask the school directly about how it supports students receiving special education services and English learners, since the IB framework can be demanding and these supports matter. Staffing, discipline, attendance, and course access data were also absent, so we cannot describe class sizes, teacher credentials, or enrichment offerings beyond the IB structure itself.
No housing or economic context was provided, so we cannot speak to home values, rental costs, or commute patterns. No neighbor comparison or county-level positioning was available either, so we cannot place this district against nearby options. No civil rights data was included.
What is clear from the available evidence is that Sage International School Middleton offers a family something uncommon: a free, public charter pathway built around the IB continuum, letting students stay in one school from kindergarten through high school graduation with the option to earn an IB Diploma. The academic results so far are moderate and uneven across grades and subjects, consistent with a young school still building upward. The small size and IB identity will appeal to families who value continuity, international-mindedness, and a structured inquiry-based approach. A parent weighing this option would benefit from visiting and asking about supports for struggling students, the rigor transition into the Diploma Programme years, and how the school plans to sustain quality as it adds upper grades.
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