Tree Health Assessments in Boise, ID

Tree health assessments answer the question most homeowners actually have: is this tree all right? In Boise the usual triggers are a crown that has gone thin, a top that leafed out late or not at all, mushrooms at the base, a new crack, or a big shade tree that started dropping limbs. Some of those trees just need dead wood taken out. Some are in a slow decline that care can slow down. A few are failing and should come down before a storm makes the choice. A walk-around assessment sorts them out and ends with a plain recommendation.

Water is the usual suspect

Boise gets about 12 inches of precipitation a year, mostly outside the summer, while the city sees around 55 days at 90 degrees or more. Large trees here live on irrigation. When a lawn is converted to rock, a sprinkler zone is capped, a new patio or addition cuts across the roots, or an irrigation schedule is cut back, the tree loses water it has counted on for decades. The damage tends to show a year or more later as thinning and dieback from the top down, which is why we ask about changes to the yard as well as looking up.

What we look at

We start at the ground: the root flare, soil heaving, girdling roots, fungal growth and wounds at the base. Then the trunk, for cracks, cavities, seams, loose bark and old pruning wounds. Then the crown, for dead and hanging limbs, weak forks with bark pressed between the stems, the density and color of the leaves, and how much of the canopy is leafing out. We also note what the tree would hit if part of it failed, because the same defect matters far more over a bedroom than over a back fence.

Pests worth knowing about

Most insect damage on Boise trees is minor and seasonal, but one regional pest is being watched closely. The Idaho State Department of Agriculture has been treating an established Japanese beetle infestation in Caldwell since the first beetle was trapped there in 2021, after an earlier find in Pocatello in 2018. The beetle's adults skeletonize leaves on a long list of hosts that includes linden, birch, maple, elm, willow and fruit trees. If you see metallic green and copper beetles feeding in clusters, ISDA's Japanese beetle program can be reached at (208) 332-8620. Pesticide applications are regulated in Idaho through ISDA's applicator licensing program; we tell you when treatment is worth pursuing and when it is not.

What you get

After the look, we tell you what we found and what we would do: leave the tree alone, prune out the problem, change watering or protect the roots, have the tree checked further, or remove it. If you want a deeper diagnosis, or a formal written risk assessment for an insurer, an HOA or a dispute with a neighbor, an ISA Certified Arborist with the Tree Risk Assessment Qualification is the credential to ask for; it can be checked on the International Society of Arboriculture's website.

Public trees are inspected for free

If the tree is in Boise's public right-of-way, you do not need to pay anyone to look at it. Community Forestry's forestry specialists, who are ISA certified arborists, inspect public trees at no charge on request at (208) 608-7700 or through the city's online form. The city does not inspect trees on private property.