The Best Time to Trim Trees in Missouri (By Season)

# The Best Time to Trim Trees in Missouri (By Season)

Missouri's four-season climate means the timing of tree work actually matters. While we can and do trim trees year-round, there are ideal windows for different types of work and different species.

Late Winter (February–March): The Gold Standard

For most deciduous trees — oaks, maples, elms, walnuts — late winter is the ideal trimming window. Here's why:

• ✓The tree is fully dormant, so trimming causes minimal stress
• ✓Without leaves, our crew can see the full structure clearly
• ✓Wounds seal faster when spring growth begins right after cuts
• ✓Fewer insects and pathogens are active to enter fresh cuts

Spring (April–May): Fine for Most, Avoid Oaks

Spring trimming is fine for most species once the risk of a hard freeze has passed. **Exception: oaks.** In Missouri, we avoid trimming oaks from April through June because this is peak activity season for the sap beetles that spread oak wilt — a devastating fungal disease. Wounds made during this period attract the beetles and can introduce the disease.

Summer (June–August): Corrective Work Only

Summer is the stress period for trees. We recommend limiting trimming to corrective work — removing obviously dead or broken branches, clearing structure conflicts, and addressing hazards. Avoid heavy pruning during extreme heat or drought.

Fall (September–November): Generally Avoid

Fall is the time when trees are drawing nutrients back from their leaves into their roots. Heavy pruning can interrupt this process. Fall wounds also tend to seal more slowly heading into winter. We save aggressive work for late winter.

Dead Wood: Any Season

Dead branches can and should be removed whenever you notice them. There's no bad season for deadwood removal.

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**Schedule your late-winter trim now before our calendar fills up.** Call BIG O TREE SERVICE LLC at 417-554-1212.