When are your winter and summer sessions? Follow Winter and Summer SessionsWinter session is in January. Summer session is in June to July and July to August.To see a current schedule go to schedule.missioncollege.edu.To see a current Academic Calendar please go here. Related articles How can I determine if my credits will transfer? Do you offer weekend classes? Student Services at Mission College Where can I find a campus map? How do I get my class schedule?