Four conifer species [Douglas-fir(Pseudotsuga men-ziesiivar.glauca(Beissn.) Franco), ponderosa pine(Pinits pondero-saDougl. ex. Laws.), western larch(LarLx occidentalisNutt.), and western white pine(Pimts monticolaDougl. ex. D. Don)], growing on three different duff depths on burned and unburned seedbeds, were examined for germination, survival, height and diameter growth after three years on aThuja plicatajClintonia unijlorahabitat type (Cooper et al. 1991) in northern Idaho. Regeneration success increased as duff thickness decreased. Germination and seedling establishment were greater on mineral soil seedbeds than the three burned duff seedbeds. Significant differences in total height and basal . diameter appeared between burned and unburned seedbeds, with taller and thicker diametered individuals for all species on burned seedbeds. Based on these findings, prescribed burning should be the site preparation method for natural regeneration of these coniferous species on this habitat type in the northern Rocky Mountains.