In the subalpine zone at Davos, Switzerland, a trial plot of seven tree species was kept artificially snow free during two winter periods and compared with a plot under natural snow cover. During the winter period, there is a higher water stress in the snow free plants, especially Norway spruce (Picea abies [L.] Karst), and deciduous species, including European larch (Larix decidua Mill.). Seedlings of these species showed serious desiccation and an increased mortality compared with the snow-covered seedlings. Desiccation occurred predominantly on the parts of the snow-free seedlings that were exposed to the sun. Flushing in spring was retarded in the snow-free plot. All measured growth parameters showed more favorable results in the snow-covered plot. Sufficient snow cover is therefore a very important factor for the success of young seedlings in the subalpine zone, especially for Norway spruce, European larch, and deciduous broadleaf species.