Garrison Mill Elementary School, 4111 Wesley Chapel Road, Marietta: K-5, 662 students in 2025, CCRPI 90.8. Zone, report card and bell times.
Last checked Oct. 6, 2026. Sources: the Garrison Mill Elementary website, the Cobb County School District’s attendance zones, feeder pattern chart, bell schedule and 2026-27 calendar, the Governor’s Office of Student Achievement’s 2025 School Grades data and the federal NCES school directory.
Garrison Mill Elementary School is a Cobb County School District elementary school on Wesley Chapel Road in East Cobb. Its about page says it has been part of the district since 1984; its mascot is the Greyhounds. Its mailing address says Marietta, but the address sits outside any city’s limits, in unincorporated Cobb County, according to the Census Bureau’s geocoder.
- Address: 4111 Wesley Chapel Road, Marietta, GA 30062
- Phone: 770-642-5600
- Grades: kindergarten to 5 (the state’s 2025 data also counts pre-K students)
- Website: cobbk12.org/garrisonmill
Who to call
- Garrison Mill Elementary front office: 770-642-5600
- Enroll a student: the district’s enrollment page; families who need an interpreter can call the International Welcome Center at 678-331-3086
- Bus routes and transportation: the district’s Transportation Department, 678-594-8000, and its bus route finder
- Cobb County School District main line: 770-426-3300
- Is this your school? Enter an address in the school and bus locator
Principal
Principal Ruth Martin, according to the school’s website.
Enrollment and teachers
The state counted 662 students at Garrison Mill Elementary in its 2025 School Grades data, against 661 in 2024. The most recent federal figure, from the NCES directory for the 2023-24 school year, is 646 students and 45 full-time-equivalent teachers, about 14.4 students per teacher.
State report card
Garrison Mill Elementary’s 2025 CCRPI single score was 90.8, according to the state’s School Grades data. The Georgia average for elementary schools was 78.6 and the Cobb County School District’s was 76.0. The school scored 85.3 in 2023 and 94.9 in 2024. Scores can move a lot from one year to the next at a single school. The full report card, with subgroups and the parts of the score, is on the state’s Garrison Mill Elementary report card.
CCRPI is the Georgia Department of Education’s “comprehensive school improvement, accountability, and communication platform,” according to GaDOE. The single score runs from 0 to 100 and is built from content mastery, progress, closing gaps and readiness, plus graduation rate for high schools. Georgia does not publish an A-to-F letter grade for schools in its 2025 data.
Georgia Milestones end-of-grade tests, 2025, share of tested students scoring Proficient and Distinguished, the two upper achievement levels:
| Subject | Proficient | Distinguished |
|---|---|---|
| English language arts | 44.1% | 21.9% |
| Math | 37.4% | 32.7% |
| Science | 37.4% | 29% |
The same data put 69% of third graders and 84% of fifth graders reading at or above grade level.
Attendance zone
Zones are set by the district and do not follow ZIP codes. Check any address with the district’s school and bus locator, or open the district’s Garrison Mill zone map (PDF) from its attendance zones page. The district says its posted maps “do not preclude any future changes” and asks families not to make a home purchase based on them alone.
The district’s feeder pattern chart, updated June 30, 2024, sends all of the Garrison Mill zone to Mabry Middle. From there, students go on to Lassiter High, according to the same chart.
We found no rezoning approved by the Board of Education that changes the Garrison Mill zone for 2026-27; the district’s posted zone maps are labeled 2022-23 for high schools and 2023-24 for middle and elementary schools.
Calendar and bell times
The district’s 2026-27 bell schedule (PDF) has Garrison Mill Elementary starting at 7:50 a.m. and dismissing at 2:20 p.m..
From the district’s 2026-27 calendar (PDF):
- Monday, Oct. 12: digital learning day
- Tuesday, Oct. 13, to Friday, Oct. 16: conference week, early release for elementary and middle schools only
- Tuesday, Nov. 3: Election Day, student holiday
- Nov. 23-27: Thanksgiving break
- Thursday, Dec. 17, and Friday, Dec. 18: early release, all schools
- Dec. 21 to Jan. 1: winter break; Monday, Jan. 4, is a student holiday
- Wednesday, May 19, 2027: last day of school
More
- The school’s website
- The state’s report card for Garrison Mill Elementary
- Every public school in East Cobb, with zones and scores: our East Cobb public schools guide
- District calendar, registration and the Board of Education: our East Cobb schools guide
Frequently asked questions
What grades does Garrison Mill Elementary serve?
Kindergarten through fifth grade. The state counted 662 students in 2025. The state’s data also counts pre-K students at the school.
What is Garrison Mill Elementary’s CCRPI score?
90.8 in 2025, according to the state’s School Grades data, against a Georgia elementary school average of 78.6 and a Cobb County School District average of 76.0.
Which high school does Garrison Mill Elementary feed into?
Mabry Middle and then Lassiter High, according to the district’s feeder pattern chart.
What time does Garrison Mill Elementary start?
The district’s 2026-27 bell schedule has Garrison Mill Elementary starting at 7:50 a.m. and dismissing at 2:20 p.m.
Who is the principal of Garrison Mill Elementary?
Ruth Martin, according to the school’s website on Oct. 6, 2026.
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