For most species on the Peninsula, late fall through early spring – the dormant season – is ideal for heavy pruning. It minimizes stress, reduces disease exposure through fresh cuts, and lets the tree channel its energy into healthy spring growth. That said, dead wood, hazardous branches, and fire prevention clearance can and should be done any time of year – waiting until the “right season” is not worth the risk when a branch is a liability.

The big local exception: native California oaks prefer the dry season (July through October) – wet-season pruning invites the pathogen behind sudden oak death. If your yard mixes oaks and ornamentals, the honest schedule is two visits, not one.