The answer is, "it depends"

No two trees are the same and no two trees require the same type or frequency of tree trimming. 

That said, we offer some practical rules of thumb to help you decide what types of trees you should consider trimming at different points in the year. As always, we recommend getting in touch for a free on-site assessment from one of our ISA-certified arborists. Together, we can craft a custom pruning program or schedule through our Tree Maintenance Program.

Winter (Late Dormant Season)

Yes - we work in the winter! In fact, trimming your tree in the winter is one of the safest and best times to trim your tree. During winter, deciduous trees are in a state of dormancy. This means they are not actively growing, and their metabolic processes slow down. Trimming during dormancy minimizes stress on the tree, as it can allocate resources to wound healing without the demands of new growth.

• Deciduous Trees - Trim during late winter when the tree is dormant. This period allows for the identification of the tree's structure, and the lack of leaves provides a clear view of branches. 
• Fruit Trees - Late winter is often recommended for fruit trees, especially before the buds start to swell. 

Spring (Pre-Bloom)

While spring is suitable for certain trimming tasks, it's essential to consider the specific needs and characteristics of each tree species. Some trees, especially those susceptible to certain diseases or pests, may have optimal trimming times outside of the spring season.

• Flower Trees and Shrubs - Trim right after flowering to avoid removing buds that formed during the previous growing season. 
• Summer-Flowering Trees - Trim in late winter or early spring before new growth begins. 

Summer (After New Growth)

Contrary to popular belief, summer is not the optimal time for extensive trimming, as it can place stress on trees during their active growing season. However, there are specific situations and types of trimming that may be appropriate in the summer. We would advise you to get in touch to discuss your specific situation. 

• Deciduous Trees - Summer is suitable for corrective trimming, such as removing water sprouts or unwanted branches. Avoid heavy trimming during this time. 
• Evergreen Trees - Light trimming can be done in the summer. 

Fall (Late Season)

Fall can be a great time to perform certain types of trimming, with considerations for the specific goals of each tree species. Heavy trimming, especially on mature trees, should be approached with caution in the fall. Removing a significant portion of the canopy during this time may result in stress and reduced energy reserves for the tree - just as they are entering winter dormancy. 

• Deciduous Trees - Trim in late fall once leaves have dropped. This period allows for structural pruning and removal of dead or weak branches.
• Disease-Prone Trees - If your tree is susceptible to diseases spread by insects, fall trimming can be beneficial as pests are less active. For example, trimming Oak trees in the fall/winter is a perfect time due to Oak wilt.