Summary:
Zip code 20151 in Chantilly, Virginia, is served by two middle schools—Rocky Run Middle and Franklin Middle—both part of Fairfax County Public Schools and both serving grades 7–8. While both schools are strong choices compared to state averages, Rocky Run is the clear academic standout. It has ranked in the top 5% of all Virginia middle schools for three consecutive years—currently 21st out of 416 with a 5-star rating. Franklin is also high-performing, ranking 79th (81st percentile, 4 stars), but it consistently trails Rocky Run by roughly 7–8 percentage points in overall proficiency. Both schools benefit from being in a district rated in the top 70th percentile statewide.
Test results reinforce Rocky Run’s edge. In 2025–26, Rocky Run posted about 93% proficiency in 7th and 8th grade reading, versus 84–88% at Franklin. Science proficiency was 87% at Rocky Run and 79% at Franklin, both well above state averages. Both schools achieve 100% proficiency in 7th-grade Algebra I and 8th-grade Geometry, and Rocky Run also reports 100% in 8th-grade Algebra II. The notable weak spot is standard 8th-grade math: Rocky Run scored 49% and Franklin 37%, with Franklin falling below the state average of 47%. Chronic absenteeism is lower at Rocky Run (9.0%) than at Franklin (12.1%), which aligns with Rocky Run’s higher achievement.
Interestingly, Franklin actually spends more per student ($12,402 vs. $11,983) and has a lower student-teacher ratio (13.5 vs. 15.1), yet Rocky Run outperforms it in nearly every subject. The two schools have similar free/reduced lunch rates (about 20–21%), making the performance gap especially notable. Families in this area can feel confident in either school, but for those seeking the highest academic results, Rocky Run Middle is the standout choice. One caution: Rocky Run’s 8th-grade math proficiency dropped sharply from 79% to 49% year-over-year, a trend worth monitoring, but overall both schools remain excellent options in an already strong district.
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