Dears,
I know that this is something I should not be thinking about, but for a 1st timer studying in the abroad and US specially, that is an issue. So please i would like to know a general knowledge of the schedule - calendar regarding vacations and days off. e.g: summer break, spring break...etc.
Thank you :)

Google is your friend.

Usually:

End of August - mid-December: fall semester
Mid-December - early-Jan: winter break
January - mid-March: Spring semester
March - end of May: Spring semester
May - August: summer break/internship

A very generous reply.