Monitoring finds dense regeneration across treated parcels; Summit County staff recommends targeted thinning

Jordan Mead, Open Space and Trails Senior Resource Specialist, presented the 2025 tree regeneration monitoring report to the Summit County Open Space Advisory Council on Jan. 7. Monitoring covered 13 Open Space parcels that had hazardous-fuels treatments between 2008 and 2013.

Mead said staff found all sampled sites to be overstocked, with densities exceeding 1,500 trees per acre and a dominance of seedlings generally under 4.5 feet in height. He explained that management typically targets thinning when trees reach the sapling stage (about 6–15 feet tall) because earlier thinning risks encouraging new seedling establishment; later thinning helps staff select the most vigorous trees and can preserve beneficial self-pruning.

Three lower-elevation sites were identified for immediate thinning: Iron Springs (treated in 2008), portions of Mesa Cortina where staff and volunteers have already begun thinning, and Willowbrook, where aspen stands were dominant and lodgepole occurred in small dense patches. Mead noted some Golden Horseshoe sites were approaching sapling densities that would warrant thinning and that future monitoring will include tree-height measurements to better time future treatments.

Council members asked about lower-labor treatment alternatives; staff noted lodgepole pine is prolific and often requires active management because of its tendency toward large, stand-replacing disturbances such as beetle infestations and crown fire.

The monitoring results will guide future thinning priorities and timing for treated parcels across the county.