Kansas tree care calendar
A month-by-month planner for Kansas trees: when to prune (and when oak pruning must stop), when bagworms hatch, when to water through drought, when to plant, and how to prepare for storm season.
Most tree work here is not difficult. It is time-sensitive. The same cut that builds a sound oak in February is an open invitation to oak wilt in May, and a bagworm treatment that works in the first week of June accomplishes almost nothing by August. This page is the schedule the rest of the site runs on.
Start here
The whole year is below in order. If you only want the next four weeks, jump straight to it — every month has its own link, so you can send somebody a specific month rather than the whole calendar.
If you remember nothing else
Miss most of this calendar and your trees will be fine. Miss these three and you can lose an oak, waste a season of bagworm treatment, or plant into the worst month Kansas offers.
April 1
Structural pruning on oaks has to be finished before April. From April through July the beetles that spread oak wilt are flying, and a fresh cut is what draws them. The window reopens once the trees are dormant again in December.
Late May
Treatment works on caterpillars that are still small, which means late May into the first half of June and not later. By August the bags are obvious and spraying them accomplishes very little.
September
Fall is the stronger planting window in Kansas: the heat has broken, the soil is still warm enough to grow roots, and the tree gets a full cool season to establish before it is asked to hold leaves through a Kansas July.
The full year
Each month lists the jobs worth doing and the one thing worth looking for while you are out there. Dates shift a week or two between Liberal and Leavenworth, and further in an odd spring — treat them as the order of operations rather than appointments.
Dormant pruning season
Ice-loaded limbs. Never stand beneath them or try to shake ice off.
Finish major pruning
Sunscald cracks on the southwest side of young, thin-barked maples.
Mulch, plant, last call for oaks
Cedar-apple rust galls swelling orange on junipers in wet spells.
Prime planting — stop pruning oaks
Anthracnose browning on sycamore and ash in cool, wet springs — ugly, usually recoverable.
Pest scouting begins
Sticky honeydew under maples and lindens — aphids at work overhead.
Storm season peak
Cracked branch unions after wind — photograph and assess from the ground.
Heat and drought defense
Spider mite stippling on junipers and honey locust in hot, dry stretches.
Peak stress month
Fall webworm nests on branch tips — cosmetic; prune out or leave them.
Fall planting window opens
One branch turning color weeks early — a stress flag worth investigating.
Prime planting and cleanup
Bagworm bags on junipers — hand-pick through winter to cut next year's hatch.
Winterize
Rabbit and vole gnawing at the base — hardware-cloth guards stop girdling.
Dormant season returns
Heavy wet snow — let it melt off limbs; knocking it loose breaks more than it saves.
A calendar is built on averages, and no particular year is average. A warm February pulls buds forward; a wet spring turns anthracnose from a footnote into the whole story; a drought moves watering from a chore to the only job that matters.
Read the tree before you read the month. If the leaves are wilting in June, water it — the fact that the calendar says July is watering season does not buy you three weeks. And where a job needs a rope, a chainsaw above shoulder height, or a decision about whether a tree is sound, the honest answer is not a date on a page.
Kansas Tree Guide is an independent educational resource. Nothing on this site replaces an on-site assessment by a qualified arborist or tree-care professional. Last reviewed August 2026.
