The answer to 'best time for tree trimming' is that the best time to trim trees is typically in the late winter or early spring, before new growth begins. This is the dormant season for most trees, which makes it an ideal time for trimming. Trimming during the dormant season helps the tree recover more quickly and minimizes the risk of disease or pest infestations.
Trimming during the dormant season also allows you to better see the tree's structure and identify any dead or damaged branches that need to be removed. Additionally, the cooler temperatures and reduced sap flow during this time of year make the trimming process less stressful for the tree.