Estimation methods of snow depths by tree forms of Japanese cedar and Japanese larch were studied.The absolute maximum depth of snow (H) in 10 years can be estimated by the following formulaH=H1H=H2+0.5H=H3+0.4 (unit : meter) where H1; hight of drooping branches of Japanese cedar caused by the settling force of snowH2 ; height of scars of tree trunks of Japanese cedar caused by bending of treetop under snow cover at an early ageH3; height of scars on the trunks of Japanese larch caused by the settling force of snow at the time of the breaking off of branchThe drooping branch method is applicable on steep slopes and the smallest sample numbers are required for the estimation. When the branches of Japanese cedar have been pruned off or the boundary of the drooping branches is not clear, then the trunk scar method or the broken branch method is applicable.