Late September brings the first significant fall rains to Pacific Northwest lowlands, triggering explosive chanterelle fruiting that transforms forest floors into golden treasure troves. After months of summer drought, the first substantial precipitation events (typically 1-3 inches over several days) stimulate chanterelle mushrooms to push through the forest duff in massive numbers. Pacific golden chanterelles (Cantharellus formosus) and other species fruit prolifically in coniferous forests, with experienced mushroom hunters reporting pounds to tens of pounds of mushrooms in productive locations. The sudden abundance creates a gold rush atmosphere as commercial and recreational foragers head to the woods. Chanterelles continue fruiting through November and into December, but the late September flush following first rains represents one of the most productive and exciting periods for mushroom hunters throughout the Pacific Northwest.