"How long is this going to go on?" is the question, and the person asking is usually standing in a yard with cotton stuck to everything. The honest answer is one they do not expect: the cotton is the short part.
A mature cottonwood drops something onto your lawn in most months of the year. Sticky bud scales in March. Red catkins in April. Cotton for about two weeks around Memorial Day. Twigs after every windy afternoon. A whole canopy of leaves inside about three weeks in October. None of that means the tree is sick — it is simply what the species does. But knowing which month brings which mess is genuinely useful, because it tells you when a cleanup is worth doing, when it is a wasted Saturday, and when to get on a tree crew's schedule before everyone else does.
Here is the calendar we work from, written for south-central Kansas.
The Short Answer: Two Weeks of Cotton, Nine Months of Everything Else
If you mean the cotton specifically: a single female cottonwood typically releases its cotton over about one to two weeks, usually starting somewhere between mid-May and early June here. Because trees on the same block do not ripen in lockstep, the neighborhood-wide cotton season runs longer — commonly three to four weeks from the first drift to the last. If there are several cottonwoods within a few hundred yards of you, expect to be in it for the better part of a month even though no individual tree is shedding that whole time.
If you mean shedding in the broader sense — anything that lands on your lawn and needs picking up — a cottonwood is dropping something roughly nine months out of twelve. That is the version of the question worth planning around.
Six Things a Cottonwood Drops
Before the month-by-month, it helps to know the cast of characters. Nearly every cottonwood complaint we hear is one of these six:
- Bud scales. The resinous coverings that protected the buds all winter. They fall in early spring, and they are tacky — they stick to shoes, windshields, and patio furniture.
- Catkins. The flowering structures. Males drop theirs all at once after shedding pollen; females hold on and turn theirs into seed capsules.
- Cotton. The seed fluff, from female trees only. Late spring, about two weeks, then done for the year.
- Twigs and small branchlets. Year-round background litter, heaviest after wind. Cottonwood self-prunes shaded interior twigs and simply lets them go.
- Leaves. A very large volume, dropped fast in fall, plus a partial drop in a hot dry summer.
- Deadwood and, occasionally, live limbs. The one item on this list that is a safety matter rather than a cleanup chore.
The Month-by-Month Cottonwood Drop Calendar
January – February: deadwood and bark
Nothing biological is happening, but wind and ice are. What comes down in these two months is material the tree was already carrying dead: brittle twigs, small dead branches out of the interior canopy, and slabs of loose outer bark off an old trunk. After an ice event, expect a bigger pile — and expect some of it to be live wood.
This is also the best working window for the tree. With the leaves off, the entire framework is visible, and this is when structural problems get found and fixed. If a cottonwood is on your list for pruning this year, this is the season it should happen — our guide to the best time to prune trees in Kansas covers the timing logic species by species.
March: the bud scales let go
The first real shed of the year, and the one nobody expects. As the buds swell, the resin-coated scales that sealed them all winter drop off — small, brown, and sticky enough to track indoors. On a driveway under a big tree it looks like someone scattered gravel. It lasts a couple of weeks, and there is nothing to do but sweep.
Catkins are hanging by now too, which gives you the one clean chance each year to answer the question that governs everything else: is the tree male or female? Short, thick, reddish catkins mean male — that tree will never make cotton. Longer green ones that stay put and start beading up mean female. If you have never checked, check in March; our field guide to identifying the Kansas state tree walks through the catkin difference along with the rest of the ID.
April: the catkin drop
Male trees finish shedding pollen and then release every catkin more or less at once. For a few days you get what people describe as red caterpillars all over the sidewalk, the deck, and the pool. It is startling the first time, and it is completely over inside a week.
Female trees do not do this. Theirs are swelling into strings of small green capsules that will not open for another six weeks. Leaves come out through April as well, so the yard finally starts looking like something.
May: the countdown
Most of May is quiet on the ground. What matters is happening overhead — those capsules are ripening, and late in the month they start splitting.
By the last week of May in a normal year, the first cotton is moving. A cool, wet spring pushes it later; a warm dry one pulls it forward. The start date shifts by a week or two from year to year, which is why nobody can hand you a fixed calendar date.
Late May to mid-June: cotton
The main event, and the shortest one. An individual tree runs about one to two weeks. Across a neighborhood with several female trees, three to four weeks is typical.
Two things drive how bad it feels. First, whether the release lands in a dry, breezy stretch — wind is what turns a manageable two weeks into fluff piled against the fence. Second, how many female trees are actually within range, which is often more than people think, because cotton travels a long way on the wind. That is why so many homeowners are convinced their own tree is the culprit when it is not.
Nothing sprayed, pruned, or applied stops cotton on a mature tree. What works during the window is damping it down: a sprinkler pass in the morning so the cotton mats instead of drifting, a hose across hard surfaces, and mesh over the AC condenser intake, shaken out every few days. Our main guide to cottonwoods in Wichita goes further into why some springs are far worse than others, and what does not work.
Mid-June: the aftermath
Once the fluff is gone, the spent capsules and their stems come down — a fine brown litter for a week or so. It is the tail end of the reproductive cycle and the last of it until next spring. This is the point at which a cleanup is worth paying for, not two weeks earlier while cotton is still landing.
July – August: twigs, drip, and the limb nobody saw coming
Three separate things overlap here.
- Twig litter. Steady all summer, with a noticeable pile after any of our afternoon storms. Normal.
- Sticky drip. If a car parked under the tree comes out spotted, that is honeydew from aphids feeding in the canopy, sometimes followed by a dark sooty mold on whatever it lands on. It is a nuisance rather than a threat to a big healthy tree, but heavy repeat infestations on a stressed one are worth a look from plant health care.
- Summer limb drop. The one that matters. Cottonwood is among the species prone to dropping a large lateral limb on a hot, still afternoon — no storm, no warning, no visible defect beforehand. July and August are the peak. If the canopy reaches over a roof, a driveway, or where people park, this is the risk to plan around, not the cotton.
Deep watering through a drought stretch genuinely helps, both with limb-drop risk and with the next item on the calendar.
September: the drought drop
In a dry, hot late summer — which is most of them here — a cottonwood starts dumping leaves early to cut its own water losses. Yellow leaves coming down in early September is usually water stress, not disease and not death. A wet spring can also leave leaf-spot fungi in the canopy that cause a partial midsummer drop.
Different, and worth a professional look: leaves that brown and stay hanging on one section of the canopy, a limb that leafed out noticeably thin, or dieback in the upper crown that gets worse year over year. Our list of signs a tree needs removal covers where that line sits.
October: everything, at once
Clear yellow for a week or two, then the whole canopy comes down over roughly two to three weeks. The volume surprises people who moved in during winter. A mature cottonwood carries a great deal of leaf area, and it does not let go gradually the way an oak does.
The practical version: gutters are the real issue, not the lawn. Clean them once the drop finishes rather than in the middle of it, or you will be doing it twice.
November – December: twigs, then ice
Leaf drop wraps up in early November. After that it is back to twigs and deadwood, with the first hard freeze and the first ice of the winter shaking loose whatever was already dead up there. The structure is fully visible again, which makes late fall the right time to look up and decide what needs doing.
What to Know Before You Book
The calendar above is not trivia — it changes what a job costs, how long it takes, and how far out you will be scheduled. Four things worth knowing.
Book structural pruning for the dormant window, and book it early
Late fall through early spring is when a cottonwood should be pruned: the framework is visible, the cuts close well, and the crew is not working around a full canopy. The catch is that everyone wants that window. Calls placed in October and November get the January and February slots; calls placed in January are competing with storm work. If you already know a limb has to come off this winter, get the estimate on the books in the fall.
What should never happen to a cottonwood in any month is topping. The species responds to it about as badly as anything in Kansas — fast decay at the cuts and weakly attached regrowth carrying more weight higher up. We made the full case in our piece on tree topping in Wichita.
Do not schedule cleanup in the middle of a drop
This is the most common scheduling mistake we see, and it costs homeowners money. Booking a yard cleanup during the cotton release, or gutter work in mid-October, means paying for work that gets undone within days. Wait for the tail end: mid-June for the spring cycle, early to mid-November for the fall one.
The season changes a removal, not just the price
A cottonwood can be removed in any month. But a tree in full leaf produces substantially more debris volume than the same tree bare, and debris volume is a real component of what a removal costs. Dormant-season removals also give the crew better sightlines into the structure, which matters on a species that hollows out from the inside. If a removal is not urgent, winter is usually the better booking. Our breakdown of tree removal costs in Wichita covers the other factors that move a quote.
If a large removal is happening on your property, ask about debris handling up front. A big cottonwood generates a lot of material, and grapple truck hauling is often what turns a multi-day cleanup into a single afternoon.
Emergency work does not follow this calendar
Everything above assumes you are planning ahead. Summer limb drop and storm failures are not planned, and they cluster in exactly the months when scheduled crews are busiest. If a limb is already down or a tree has come apart onto a structure, that is a call to 24/7 emergency tree service, not a request for next month's schedule. Our checklist for preparing trees for storm season is the version of this to read in February.
Planning the Year at a Glance
- Want to know whether you will get cotton this year? Check the catkins in March.
- Want the pruning done right? Get the estimate in fall; the work happens January through early March.
- Want the spring mess cleaned up once? Mid-June, after the capsules finish dropping.
- Worried about a limb over the house? Deal with it before July, not during it.
- Gutters? Early to mid-November, after the leaves finish.
- Considering removal? Get the assessment any time; schedule the work for the dormant season if it is not urgent.
"People think the cotton is the problem because it is the part they can see. Two weeks of cotton has never hurt anybody. The limb that comes off on a still afternoon in July is the one I want homeowners thinking about."
— Joe Kohnen, Owner, Kohnen's Tree Service
Frequently Asked Questions
How long does a cottonwood shed cotton? A single female cottonwood usually releases its cotton over about one to two weeks, most often between mid-May and early June in south-central Kansas. Because nearby trees do not ripen at the same time, the cotton season across a whole neighborhood commonly runs three to four weeks. Weather shifts the start date by a week or two in either direction each year.
When do cottonwood trees drop cotton in Kansas? Late May through mid-June is the usual window. A cool, wet spring delays the release and a warm, dry one pulls it earlier. Cotton comes out when the seed capsules dry and split, so a stretch of warm, breezy days is what turns a gradual release into a heavy one.
Do all cottonwood trees shed cotton? No. Only female trees produce cotton — it is seed fluff, not pollen. Male cottonwoods shed pollen catkins in April and then produce nothing else all year. Most named cottonwood cultivars sold in recent decades are male clones chosen specifically to avoid the cotton.
Why is my cottonwood dropping leaves in August? Usually water stress. Cottonwoods shed part of the canopy early in a hot, dry late summer to reduce water loss, and yellow leaves coming down in August or early September are generally that rather than disease. Deep, infrequent watering during drought reduces it. Browning leaves that stay attached, thin growth on one limb, or worsening dieback in the top of the crown are a different matter and worth an inspection.
How long does cottonwood leaf drop last in fall? About two to three weeks, typically through October and wrapping up in early November. Cottonwood turns yellow and then drops fast, so the full volume arrives in a much shorter period than with an oak. Clean gutters after the drop finishes rather than during it.
Can anything stop a cottonwood from making cotton? Not practically, on a mature tree. There is no spray, pruning approach, or growth regulator that reliably prevents seed production on a large cottonwood without harming the tree. Managing the two-week window — wetting surfaces down, screening the AC condenser, running the pool skimmer — is the realistic option. Removal is a decision that should turn on the tree's structure, location, and health, not on the cotton alone.
Is a cottonwood dropping twigs all summer a sign it is dying? Usually not. Cottonwoods self-prune shaded interior twigs and let them go throughout the growing season, and any windy afternoon adds to the pile. What is worth attention is larger dead branches held in the upper canopy, a fork low on the trunk with a tight pinched seam where two stems meet, or mushrooms and shelf conks at the base.
Want the Year Mapped Out for Your Tree?
Every cottonwood is a little different, and a calendar cannot tell you whether the limb over your garage should come off this winter. That takes someone standing under it. Joe Kohnen is an ISA Certified Arborist and will walk the property, tell you what the tree is likely to do over the next twelve months, and give you a straight answer on whether that means pruning, removal, or leaving it be for now. Kohnen's Tree Service is family-owned and owner-operated, fully insured, and rated 4.9 from 130+ Google reviews.
We serve Wichita and communities within roughly 40 miles of our Park City base, including Derby, Bel Aire, Andover, Goddard, Maize, Newton, Valley Center, and El Dorado.
Request a free in-person estimate, or call (316) 207-4740. We respond the same day.