The Methow Valley starts at the east end of the Cascades, at the headwaters of the Methow River. It includes the towns of Twisp and Winthrop, as well as the unincorporated community of Mazama. Residents of the valley experience the same four seasons most of us do — spring, summer, fall, and winter. But in the last ten years, a fifth season has crept into Methow Valley life: smoke season.