Will That Tree Hit My Car? How to Tell

A leaning tree is not the same as a falling tree

Most trees that lean are not about to fall, and the lean alone tells you very little: a tree that has leaned since it grew that way is usually anchored by a root plate that formed around the lean, while a lean that appeared recently is the warning sign. So the question is not whether the trunk is crooked. It is whether the lean is new.

Here is the short version of what to check, in the order that matters most:

• Has the lean changed since you last looked? Compare against a fence line, a driveway edge, or a photo on your phone.
• Is the soil around the base heaved, cracked, or mounded on one side?
• Are there dead branches in the crown, or a fork with a crack running through it?
• Is the tree close enough that its height would reach your parking spot if it came down?

Those four checks take about five minutes and will tell you more than any general rule about species or age.

What a tree does before it fails

A tree that is about to fall almost always shows ground-level evidence first, so start at the base and work up. The root plate is what holds the tree upright, and when it starts to fail you see soil lifting or cracking in a ring or a crescent around the trunk, sometimes with a gap opening on the side away from the lean. Fresh cracks in the dirt near the trunk, after a stretch of wind or heavy rain, are the single most useful thing a property owner can spot.

Look at the trunk next. A vertical crack, a seam of bark that has split and is oozing, or a hollow you can see into are all signs the wood inside is no longer carrying the load it was built for. Conks, the shelf-shaped fungal growths on a trunk, mean decay is advanced enough to fruit. That does not mean the tree falls tomorrow, but it does mean the trunk is weaker than it looks.

Then check the crown. Dead branches hold on longer than people expect, but a branch that has died and is hanging without bark, or one that has dropped its small twigs while the rest of the tree is leafed out, is a candidate to come down on its own. A fork where two main stems meet at a narrow angle, with a crack or included bark running down the joint, is a common failure point in wind.

How close is too close to your car?

If a tree is taller than the distance from its trunk to your parking spot, it can reach your car when it falls, and that is the only distance calculation you need. Pace it out. A tree 60 feet tall that stands 40 feet from the driveway is within striking range, and one 30 feet from the car with a 70 foot crown is well past it.

Height is easy to estimate without tools. Hold a stick at arm's length so the visible length above your hand matches the distance from your eye to your hand, then walk backward until the top of the tree lines up with the top of the stick. The distance from you to the trunk is roughly the tree's height. It is not precise, but it does not need to be.

Direction matters as much as distance. Most trees in this region do not fall in a random direction. They fail toward the side with the weak roots, toward the side the lean has developed, or with the prevailing wind in a storm. If your car sits on the side the tree is already leaning toward, the risk is higher than the tape measure suggests. If the car sits on the opposite side, the tree still matters, but the odds are better.

Which trees are worth worrying about most

Trees with root damage, trunk decay, or a recent change in lean are the ones to act on, and the cause of that damage is usually something a property owner did or can see: grading, a new driveway, a trench for a utility line, or a patio poured within the root zone. Roots spread well beyond the canopy, and cutting them on one side removes the anchor on that side.

Species and setting change the odds too. Fast-growing trees with soft wood tend to fail more often in wind than slow-growing, dense-wooded ones. A tree that grew up in a stand and suddenly has open ground on one side, because a neighbor cleared or a building came down, has less shelter than it was shaped for. Trees on a slope, or in soil that stays saturated through the winter, hold less firmly than trees on level, well-drained ground.

One more thing worth saying plainly: a tree that has already dropped a large limb is telling you something about the rest of it. That is the tree to look at first, not the one that looks fine from the street.

Start at the soil, not the sky. The ground tells you what the crown cannot.

What to do when the tree is over your car and you are not sure

Move the car first, then decide about the tree. Parking somewhere out of reach costs you nothing and removes the question entirely while you sort out what the tree needs. If the tree is on a neighbor's property, that conversation belongs to the neighbor, but the car is yours to move today.

Then get eyes on it from the ground. Photograph the base, the lean, and any crack or fungal growth, and take a second set in a few weeks from the same angle. A lean that has visibly moved between two photos is a different situation from one that has not budged. If the trunk is cracked, the root plate is lifting, or the tree is leaning over a spot where people park or walk, that is the point to have it looked at rather than watched.

When we look at a tree like this, the work starts with the base and the load. A tree with a failing root plate is not climbed the way a healthy tree is, because the trunk is no longer a reliable anchor. It is often taken down in sections from the top, with rigging, so weight comes off in controlled pieces instead of all at once. A tree with a hollow trunk gets the same treatment. The harder the tree, the more the job is about controlling where the pieces land, and that is the part you want planned before anyone cuts.

What the job costs depends on height, how close the tree sits to the car, the house, or a fence, whether the wood has to be rigged down or can be dropped, and what happens to the debris. Those are the things to ask about when you call: how the tree will come down, where the pieces will land, and whether the stump is included. The number itself needs someone standing on the ground looking up.

The decision: move the car now, and have the tree assessed if any of these are true

Move the car out from under any tree that has a new lean, lifted soil at the base, a cracked trunk, or dead limbs overhead, and have the tree looked at before you park there again. If none of those are present and the tree has not changed since you last paid attention, watching it with a photo for comparison is reasonable.

Use this as your checklist before you call:

• Soil cracked, lifted, or mounded around the trunk.
• A lean that is new or has grown since you last looked.
• A vertical crack, split bark, hollow, or shelf fungus on the trunk.
• Dead limbs in the crown, or a narrow fork with a crack in the joint.
• Recent digging, grading, or paving within the root zone.
• The tree is tall enough to reach where you park.

Two or more of those together is enough reason to stop guessing and get the tree in front of someone who takes trees down for a living. If you are in Spokane and want a tree looked at, call us and describe what you are seeing at the base. That description tells us more than the height ever will.