In the USA, sales and use of “fat bikes” have increased dramatically in the past five years. These bikes are designed to open new terrain to cyclists, including snow-covered trails and softer ground surfaces impossible to ride with a standard mountain bike. This study found that conflicts among winter trail users appear to be common, with cyclists reporting issues with both cross country skiers and snowmobilers. One rapidly developing approach for mitigating these conflicts is the development of winter trails specifically for fat bikes.