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After School Programs

PTSA-Coordinated Programs

Spring 2020

Registration begins: March 9, 7:00 PM
Registration closes: March 24, 11:59 PM
Contact Us:
Phone #: (240) 654-0877
Class Descriptions: Spring 2020 Flex Descriptions PDF

Girls on the Run

Tuesday and Thursday at CJMS after school until 4:30 starting Tuesday, March 10 and ending May 19. Girls need to register online at

All After School Programs

For a comprehensive list of after-school Sports, and CJMS-sponsored, PTSA-sponsored and Parent-sponsored Clubs and Activities, visit the Cabin John MS pages. (Previews below)


Clubs and Activities

PTSA-Coordinated Programs

Winter 2020

Where: CJMS Room Assignments PDF
Registration began: December 5, 9:00 AM
Registration closed on: January 8, 5:00 PM
Contact Us:
Phone #: (240) 654-0877
Class Descriptions: Winter 2020 Flex Descriptions PDF

Fall 2019

Registration begins: September 4, 7:00 PM
Registration closes: September 16, 5:00 PM
Registration link:
Contact Us: (240) 654-0877

Parent Sponsored Academic & Competition Activities

Model UN
October – June
First LEGO League
Dale Yuzuki
(301) 326-6112

First LEGO League is a fantastic international robotics and research project competition where students “develop critical-thinking and team-building skills, build STEM self-confidence, and gain valuable perspective on the importance of failure in the learning process.” (More information)

Parental involvement and contribution is expected, and an in-person interview is required – we want to have a great experience for everyone.

We will start our first meeting on Friday, Sept 13 from 310pm-415pm and will meet weekly through January or February when the state-wide competitions begin.