You can have your hair transplanted in all seasons. There is no reason to say that it can be done only in summer or in winter. The operation is performed in the same manner in all seasons. However, after having the transplant, it is best to protect the recipient area from too hot or too cold weather, from high and low temperatures in all seasons. Therefore, no matter in what season you had your hair transplantation operation, you should avoid too hot or too cold weather after your hair transplant.