How long can I leave the top of my tree is dying before it becomes dangerous?
Slow, and the slowness is the trap — this is a two-to-five-season story, so it is easy to keep not calling. What changes while you wait is the wood itself. Dead branches lose flexibility and lose their grip on the parent limb, and after a season or two the dead sections begin shedding on their own, which converts a tree-health problem into a falling-objects problem. If the dead wood stands over a driveway, a deck, a walkway, or a play area, removing that deadwood becomes a this-month job even while the tree's own future remains a this-year decision.
Whether it can still be saved
It turns on how much crown is already gone and whether the cause is findable. As a working rule, below about a quarter of the crown dead, with the cause identified and corrected, a tree can rebuild. Past roughly half you are managing a decline rather than reversing one. The interventions that actually help are soil-side, not saw-side: relieve compaction, mulch the root zone out toward the drip line, water properly through dry spells, and stop whatever keeps damaging roots. Pruning removes dead wood for safety — it does not treat the cause, and heavy pruning of an already-stressed tree makes matters worse. Insist on a diagnosis before buying any treatment, because injections aimed at a vascular disease do nothing for a compacted root plate, and vice versa.
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