We know. Cranberries are a fall fruit and cherries dont come into season until late spring or early summer so what business do they have being in a pie together? Plenty of business. See, the cherries are syrupy and sweet while the cranberries bring in their signature tartness. Its a yin and yang kind of thing. And since both fruits freeze so very well, its a filling that works any time of year. (and its even easy. Really easy. You might even say easy as pie. ).