When to Trim Trees in Washington State

Pruning at the right time of year does more than any other maintenance you can give a tree. In Western Washington, our wet winters and dry summers create a unique pruning calendar.

Late dormant season (January–early March) is the gold standard for most deciduous trees. Energy reserves are stored in the roots, the structure is visible without leaves, and disease pressure is low. Maple, oak, alder, and birch all respond well.

Spring (April–May) is the worst time for most pruning. Trees are actively pushing growth and wounds heal slowly. Sap-bleeders like maples and birches lose significant resources from cuts made now.

Summer (June–August) is best for light shaping, clearance work, and removing waterspouts. Pine and fir conifers respond well to summer pruning when the new candles have hardened off.

Fall (September–October) is generally a poor time to prune — decay fungi are sporulating and wounds don't close well before winter.

Year-round: deadwood removal and emergency hazard work can happen any time. Safety always trumps season.

Fruit trees follow their own calendar — most apples and pears want late winter, while cherries and plums prefer mid-summer to reduce silver leaf risk.

When in doubt, call. Our arborists can tell you exactly when each tree on your property should get attention.