We examine snowmobile use conflict in Yellowstone National Park to assess the effect of different winter management policies on heterogeneous visitors' welfare. Using a stated preference choice experiment we quantify welfare changes for snowmobile riders and non-riders under different snowmobile restrictions. A key determinant of welfare change is visitors' willingness to trade-off reduced snowmobile access for improved ambient conditions in the park. Our findings support the notion that welfare losses to snowmobile riders could be offset by welrare gains to non-riders, but net benefits will depend on the number of riders and non-riders and the specifics of the policy. © 2008 by the Board of Regents of the University of Wisconsin System.