Babylonian Talmud, Baba Metzia 101b

If one rents a house to one’s fellow in the winter [note: “winter” here is considered to start after Sukkot ends in the late fall], one cannot evict the tenant from Sukkot through Passover [around six months, the duration of the winter]. In the summer, [one cannot evict the tenant for] thirty days. [In other words, the landlord must give 30 days’ notice.] In large cities, whether in summer or winter, [the period is] twelve months [notice].