משנה אויף ישעיהו 44:13

[If he says,] “Until the summer,” or, “Until the summer shall be,” [he is forbidden] until people begin to bring [the figs] home in baskets. “Until the summer [harvest] is past,” [he is forbidden] until the knives are folded up [and put away]. [If he vows,] “Until the harvest,” [he is forbidden] until the people begin reaping the wheat harvest, but not the barley harvest. It all depends on the place where he vowed: if in hill-country, the hill-country [harvest]; if in the valley, the valley harvest.