Partly With the Current Schedule In ‘Eretz Yisra’el In Mind, And Entirely With Tanakh In Mind

(And I’ve been musing on this for a while)

If more schools and colleges alone followed the Hebrew calendar even with secular names (e.g., Friday, Saturday, fall break, spring break):

1) Friday and Saturday: the actual weekend 

2) The whole month of Aviv-Nisan up to Rosh Chodesh Iyar: spring break 

3) Shavu’ot: school closed

4) The four weeks (with the fasts going from 9 Tamuz through 10 Av): summer break

5) The whole month of Tishri: fall break 

6) The 10th of Tevet (which Karaites and other groups share): school closed

7) Purim: school closed (for walled cities and Yerushalayim, Shushan Purim)

8) Rosh Chodesh: school closed

In other words, one month for spring break, four weeks for summer break, one month for fall break (also partly to account for the differences in observing Tzom Gedalyah), school closed on regular Shabbatot, Rosh Chodesh and other special Yamei Shabbat, and Purim. As Chanukah (with the exception of regular Shabbat and Rosh Chodesh Tevet) requires no work restrictions, there wouldn’t need to be a winter break.