Mark Your Calendars!

Sessions & Breaks At A Glance

  • Session 1, 2017: 7 weeks, Aug. 28-Oct. 13
    • No OSA classes Sept. 4
    • Session break, no OSA classes: Oct. 16-20
  • Session 2, 2017: 8 weeks, Oct. 23-Dec. 22
    • No OSA classes on Friday, Nov. 10th
    • Mid-session break, No OSA classes Nov. 20-24
    • Winter break, no classes: Dec. 25-Jan. 15
  • Session 3, 2018: 9 weeks, Jan. 16 (Tuesday)-March 23
    • No OSA classes on Monday, Jan. 15
    • Mid-Session break, no OSA classes: February 12-19
    • Session break, No OSA classes March 26-April 6
    • Outdoor education with NatureBridge, April 2-7
  • Session 4, 2018: 8 weeks, April 9-June 1
    • No OSA classes Monday, May 28
  • “Session 5” Imaginession 2018: June 4-7

Upcoming Dates to Remember

Please check back frequently as this page is updated regularly.

The session schedule for One Spark Academy (a “Learning Center”) follows the calendar for the local district, CVUSD, due to our rental agreement for use of the Teen Center during non-operational hours. Classes for OSA are closed on national or observed legal holidays, not necessarily religious holidays.

The full calendar of Calendar of Sessions and Breaks as a PDF download: OSA School-Calendar-2017-2018


  • Thursday, 22nd: Women in History Night at TO Library, 6:00-8:00 PM. Please join us and support our girls! For event details, go here.
  • Friday, 23rd: Session 3 ends.
  • Session Break: March 26th-April 6th, NO OSA classes.


  • Monday, 2nd-Saturday, 7th: Yosemite with NatureBridge!
  • Monday, 10th: Session 4 begins
  • Pre-Registration for 2018-2019 begins.
  • Saturday, 28th: Ignite a Spark Spring Fundraiser! Our biggest community event of the year. This incredible adult-only evening at Art Trek will include a fabulous dinner, wine bar, silent auction, and art stations. Click here for details and tickets.


  • Tues/Thurs, 1st & 3rd: Parent Tours
  • Monday, 14th: General registration for Imaginession (June 4-7). This special mini-session for the arts and sciences is a great way to kick off summer.
  • Monday, 28th: Memorial Day observed. No OSA classes.


  • Friday, 1st: Last day of Session 4
  • 4th-7th: Imaginession! (“Session 5”, a mini session of imagination!)
  • Friday, 8th: the OSA Launch, our ceremonial lunch honoring those in 8th grade and older leaving OSA.
  • Fall Orientation Parent Meeting! Date in mid-June TBA soon.