FPInnovations conducted a study of pre-commercial strip thinning treatments in a very high density, naturally regenerated (age class 1) lodgepole pine stand. Semi-mechanized treatments combined mechanized strip-mulching and motor-manual thinning. Both, semi-mechanized and fully mechanized treatments were less costly than conventional motor-manual thinning. Semi-mechanized treatments preserved enough trees to meet post-thinning density objectives. Fully mechanized treatments produced tree densities above provincial minimum stocking standard densities, but below target spacing densities. Even though sufficient trees were preserved, it is unclear whether fully mechanized treatments will be able to meet the long-term stocking objectives.