Yes, students utilizing their Federal Work Study awards may also work during the summer, winter recess, any holiday, or spring break. You will need to rehire them in the summer due to the fringe benefit attached to Summer FWS.
Summer FWSP Note: Especially for summer, because Federal Work Study is a form of financial aid, make sure the student FAFSA is completed as soon as possible, and apply for financial aid through Harvard. Undergrads will also have to complete a short form indicating their interest in Summer Federal Work Study. Learn more about Summer Federal Work Study