The cold, windswept tundra hardly seems like the place to look for mushrooms. But a diverse array of fungi do indeed live above treeline. They can be found tucked under willows, nestled among mosses, lying exposed in meadows and grasslands, and surviving on mud flats. These hardy, cold-loving species have roles as decomposers and nutrient gatherers for plants, and are only found above treeline on high mountain tops and plateaus or at low elevations in the Arctic. Our survey of alpine mushrooms on the Beartooth Plateau has revealed over two hundred species of mushroom-producing fungi and we are connecting them via their DNA to their nearest relatives in Greenland, Iceland, Svalbard, Arctic Canada, the Alps and Scandinavia. Who knew?