Summary:
Zip code 80305 in Boulder, CO is home to two exceptional middle schools—Southern Hills Middle School and Summit Middle Charter School—both serving grades 6–8 and belonging to the top-ranked Boulder Valley School District No. Re2, which is rated 5 stars and ranked 5th out of 115 districts in Colorado.
Summit Middle Charter School is the strongest overall performer. It ranked 8th in Colorado for 2025–2026 (98th percentile) and has never placed lower than 8th over the past three years, while Southern Hills Middle School ranked 14th (97th percentile) after placing 9th and 10th in prior years. Summit outperforms Southern Hills in every subject and grade level, with a combined proficiency rate of roughly 82.5% versus 74.5%. The largest gap is in math: Summit's 85.9% proficiency versus Southern Hills' 71.7% in 2025–2026, while the ELA gap is just 4.9 points (83.0% vs 78.1%). Summit achieves these results with a slightly higher free/reduced lunch rate (13.39% vs 10.56%), a smaller enrollment (366 vs 502), and a lower student-teacher ratio (16.8 vs 19.3), along with a chronic absenteeism rate of only 3.6% versus 7.8% at Southern Hills.
Both schools are far above district and state averages. Southern Hills' lowest subject score is still 34.4 points above the state average, and Summit's lowest is 43.2 points above the state average. Both schools posted a 0.0% dropout rate. While both experienced similar year-over-year declines in ELA and science, their math scores remained strong and stable. Southern Hills offers a larger, more traditional middle school environment with excellent English Language Arts results, but for families seeking the absolute highest academic ceiling—especially in math—Summit is the standout. Either way, students in this zip code receive an education that is dramatically above the Colorado average.
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