Summary:
Timberlane Regional High School is the only high school in the Timberlane Regional School District, serving grades 9–12 in Plaistow, New Hampshire. The school enrolls 944 students and has a reported student–teacher ratio of 11.3:1. Because it is the district’s only high school, there is no second local high school for parents to compare directly.
The school’s strongest results are its graduation and student-retention measures. The graduation rate is 92.4%, compared with 87.0% statewide, while the dropout rate is 0.7%, below New Hampshire’s 2.3% rate. Reading is the strongest tested subject: 56% of students reached proficiency on the latest NH SAS assessment, slightly above the state and four percentage points above the district. The school’s 11th-grade SAT results match the district’s results, with 19% proficient in mathematics and 56% in reading, although both figures trail statewide results.
Academic performance is uneven, with mathematics the clearest area of concern. Only 19% of students were proficient in NH SAS mathematics, compared with 42% in the district and 44% statewide. Science proficiency was 28%, below both the district’s 32% and the state’s 38%. Results also declined from the prior year in mathematics, reading, and science. The school’s statewide ranking fell from the 46th percentile in 2023–2024 to the 28th percentile in 2025–2026, suggesting growing academic challenges despite strong graduation outcomes. For parents, the main takeaway is that the school appears successful at keeping students enrolled through graduation, but families should look closely at mathematics and science support, intervention programs, course offerings, and recent improvement efforts.
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