Signs Your Tree Is Dying — and What to Do About It

A tree rarely dies overnight. It usually slides downhill over several seasons as stresses pile up faster than the tree can recover — what arborists call a decline spiral. The good news for Denver South Metro homeowners is that many struggling trees are still savable if you catch the warning signs early. Here’s what to watch for across your yard in Denver, Aurora, Littleton, Englewood, Centennial and Highlands Ranch, and how to tell a stressed-but-fixable tree from a genuine hazard.

What does a dying tree actually look like?

Start with the canopy, because that’s where trouble shows first. Look for dieback — branches at the top or outer edges that leaf out thin, or not at all. A few dead twigs are normal; large sections of bare or brittle branches, especially spreading from the top down, suggest the tree can no longer supply its whole crown.

Watch the leaves through the season, too. Early color change and premature leaf drop in mid or late summer, scorched brown margins, or yellowing (chlorosis) are classic stress signals. One useful clue: if damage looks uniform across the whole tree, the cause is usually environmental — drought, heat, salt, root problems. If it’s patchy and uneven, a pest or disease is more likely.

Signs of trouble in the trunk and roots

Move down to the trunk and base. Several defects raise real concern:

• Conks and mushrooms on the trunk or roots. A firm bracket-shaped fungus attached to the wood is a strong sign of internal decay. White-rot fungi break down the material that stiffens wood, while brown rot leaves wood dry and crumbly. Keep in mind a tree can be decayed inside with no conk showing, so absence of one isn’t a clean bill of health.
• Peeling bark, cankers, and cracks. Sunken dead patches (cankers), bark sloughing off in sheets, and vertical cracks all point to underlying damage.
• Epicormic sprouts (watersprouts). A sudden flush of skinny shoots along the trunk or major limbs is often a stress response — the tree reacting to injury or decline.
• Lean or heaving roots. A new lean, or soil lifting and cracking on one side of the base, can mean the root plate is losing its grip.
• Woodpecker activity and small exit holes. Heavy woodpecker feeding and tiny round or D-shaped holes with sawdust-like frass suggest wood-boring insects. Borers tunnel under the bark and cut off the tree’s water and nutrient flow, producing crown thinning and branch death — and they tend to attack trees already weakened by other stress.

Colorado stresses that push trees over the edge

Front Range trees face a specific set of hardships. Drought and our dry, windy air cause leaf scorch even when soil moisture seems fine. Hailstorms shred foliage and wound bark. Late spring frosts hit trees that have already leafed out, and heavy wet spring and fall snow overloads branches still holding leaves, snapping limbs and splitting forks.

The big one for ash trees is the emerald ash borer (EAB), now established in the metro area. It’s specific to ash, and infested trees show thinning canopies, dieback, sprouting low on the trunk, and D-shaped exit holes. Untreated ash almost always decline and die once infested, so if you have an ash, get it evaluated for a treat-or-remove decision.

Stressed-but-savable, or a hazard?

Here’s the honest framing. A tree that’s savable typically has a full or mostly full canopy, healthy new growth, and a single correctable problem — it needs deeper watering, a wound left to heal, or a treatable pest addressed. Intervene early: the sooner you relieve the stress, the better the odds.

A hazard tree shows a combination of defects plus something for wind or snow to push against — significant decay, a large dead limb, a new lean, or major cracks over a target like your house, driveway, or a walkway. Most tree failures happen when a structural defect meets a loading event like a storm. That combination is what turns a sick tree into a safety problem.

When to call a professional

Call a certified arborist right away if you see any of these near people or structures:

• A new or worsening lean, or soil heaving at the base
• Large dead limbs hanging over your house, cars, or where people walk
• Cracks in the trunk or a fork, especially with decay
• Conks on the trunk with dead branches above
• A known ash tree with dieback and sprouting

For less urgent cases — thinning canopy, odd leaf drop, sprouting — a professional inspection still pays off, because secondary pests and fungi often mask the real underlying cause. Our team offers straightforward, no-pressure assessments across the Denver South Metro; see our tree services to learn how we can help you decide whether to save or remove a tree before the next storm makes the choice for you.