Summary:
Zip code 81301 in Durango, Colorado is home to two middle schools with distinctly different structures: Miller Middle School, a traditional public school in Durango School District No. 9-R serving 360 students in grades 6–8, and Mountain Middle School, a charter school authorized by the State Charter School Institute serving 302 students in grades 4–8. Both schools report zero student dropouts and rank above the statewide median, but they deliver very different academic experiences.
Mountain Middle School is the clear academic standout. It ranks 75th out of 469 Colorado middle schools (84th percentile, 4 stars), while Miller Middle School ranks 148th (68th percentile, 3 stars). On CMAS tests, Mountain posts 63.5% proficiency in English Language Arts and 63.3% in math, versus 47.8% and 33.6% at Miller. The state averages are 44.7% and 37.3%, so Mountain beats the state by roughly 19 and 26 points, while Miller is above average in ELA but below average in math. Chronic absenteeism is just as striking: 30.4% of Miller students are chronically absent, matching the 28.4% state average, while Mountain's rate is only 6.6%.
The most surprising insight is that Miller has a much lower student-teacher ratio (11.9) than Mountain (18.8), yet Mountain's test scores are far higher—a sign that curriculum, school culture, and instructional quality may matter more than class size. Miller serves a moderate share of economically disadvantaged students (35.3% free/reduced lunch), while Mountain's data are not reported. Trends show Mountain's rank has slipped from 27th in 2023–24 to 75th, while Miller has improved from the 60th to 68th percentile, narrowing the gap. Families here have two very different options: a high-performing charter with larger classes and excellent results, or a smaller-class traditional school with higher absenteeism and room for growth in math.
Thank you for your feedback!