If your garden is in a climate similar to York, PA, early spring plants will
likely need protection at first.
Plant protectors of various types (hot caps or row covers) protect the transplanted
plants from wind, sun, cold as well as animals and insects in early spring.
The added protection also enables the plant to establish itself better and hastens
growth.
Some ventilation is essential, even at first. Ventilation should be increased
gradually until the top is completely open.
Plant protectors, if done correctly, can shorten crop time by at least one week.
(Especially true of melons and other heat loving vine crops.)