Limber Pine (Pinus flexilis) populations in the southern Rocky Mountains are severely threatened by the combined impacts of mountain pine beetles and white pine blister rust. Limber pineʼs critical role in these high elevation ecosystems heightens the importance of mitigating these impacts. To develop forest-scale planting methods, six limber pine seedling planting trial sites were installed extending from the Medicine Bow National Forest in southern Wyoming to the Great Sand Dunes National Park and Preserve in southern Colorado. Seedlings came from the Colorado State Forest Service nursery and were 3 years old, container-grown, and originated from a Colorado seed source. A total of 2,160 seedlings were planted. Six plots within the sites were split between high and low density canopy conditions, with three in each canopy class.