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sunset over west by Cos Cob School
girl and 4 teachers
students high fiving a runner
students at library holding book bags
girl and boy building a cardboard marble run

Welcome to Cos Cob School


Cos Cob School is a collaborative community of learners dedicated to academic excellencepersonal integrity, and interpersonal responsibility.

GPS Norms:

  • Be Here
  • Be Safe
  • Be Honest
  • Care for Self and Others
  • Let Go and Move On

Summer reading isn't just for summer! Go to Cos Cob School's Summer Reading page for suggestions and recommendations!

Bulletin board that says welcome to your new chapter

By the Numbers


In 2016, CCS opened a state-of-the art maker space in the media center. It was the first one in the district!


359 students call CCS home.


CCS teachers have been recognized as Distinguished Teachers on five occasions.


Every Cos Cob Student receives an iPad.

School News

GPS Presents the 2024 Community Service Awards

GPS have announced that the 2024 Community Service Awards will be held on Wednesday, April 24, at 5:00 PM at Greenwich High School’s Performing Arts Center to recognize student participation in service activities that help to improve both their school and the community.

Exterior view of CMS gymnasium with scaffolding and netting

There has been no new structural damage due to Friday’s earthquake, the new cracks (or widening of existing cracks) that were noticed do not impact the integrity of the building, and because the engineer had conducted inspections of CMS in the past and knows the building very well, we are extremely confident in his findings and the continued safety of the building for our students and staff. A copy of the full report can be found online.

School Calendar