How Late Should You Mow Your Lawn in Illinois?
As summer turns into fall in Illinois, one question comes up every year:
When should I stop mowing my lawn?
If you live in Bourbonnais, Kankakee, Bradley, Manteno, or elsewhere in northern Illinois, there is not one specific date when the mower should be put away for the season.
The better rule is simple:
Keep mowing as long as your grass is actively growing.
For many lawns in the Bourbonnais and Kankakee County area, that means mowing continues through October. Depending on the weather, a final mowing may sometimes be needed even later.
At The Lawn Care Company, we would rather let the lawn and the weather determine when mowing season is finished instead of automatically stopping because the calendar says fall has arrived.
Here is how to know when your lawn is ready for its final cut.
When Does Grass Stop Growing in Illinois?
Most lawns in northern Illinois contain cool-season grasses such as Kentucky bluegrass, tall fescue, perennial ryegrass, or fine fescue.
These grasses actually prefer the cooler temperatures of spring and fall.
That means your lawn may slow down during the heat of July and August, then begin growing more actively again when temperatures moderate in September.
As fall progresses, shorter days and colder temperatures gradually slow that growth.
Eventually, the grass enters winter dormancy and mowing is no longer necessary.
That is why there is no universal "last mowing date" for Illinois.
One year, your lawn may need several cuts in October. Another year, colder weather may slow growth much sooner.
When Should I Stop Mowing My Lawn in Illinois?
Instead of choosing a date in advance, watch your grass.
If you mow the lawn and return a week or two later to find that it has barely grown, you are getting close to the end of mowing season.
Once the lawn has essentially stopped growing for the year, you can complete the final mowing and put the mower away.
In the Bourbonnais and Kankakee area, homeowners should generally expect lawn growth to slow significantly during October as temperatures fall.
However, an unusually mild fall can extend the mowing season.
The calendar is a guide. Your grass is the better indicator.
Does the First Frost Mean I Should Stop Mowing?
Not necessarily.
The first frost is a sign that colder weather is arriving, but it does not automatically mean your lawn is finished growing.
Northern Illinois can experience cold nights followed by stretches of mild fall weather. Cool-season grass may continue growing during those warmer periods.
Instead of treating the first frost as the official end of mowing season, continue watching the lawn.
If it is still growing, it can still be mowed.
If growth has essentially stopped, there is little reason to continue cutting it.
How high should the final cut be?
Keep a mowing height suited to your grass type. There is no single final-cut height for every Illinois lawn, and a drastic reduction can stress the turf.
Illinois Extension’s mowing guidance notes that a slightly shorter final cut is usually unnecessary. Avoid removing more than one-third of the grass blade at one mowing. If an adjustment is needed, make it gradually rather than taking several inches off at once.
Should I scalp the lawn before winter?
No. Continue ordinary maintenance while the lawn grows, and avoid cutting so low that soil or grass crowns become exposed.
What Happens If Grass Is Left Too Long Over Winter?
Allowing grass to become excessively tall before winter can create problems.
Long grass is more likely to bend over and become matted beneath snow, fallen leaves, or prolonged moisture.
Dense, matted turf can contribute to conditions favorable for winter lawn diseases such as snow mold.
Tall grass and excessive vegetation can also provide cover for rodents such as voles.
This is one reason we recommend continuing to mow until the lawn has actually stopped growing rather than abandoning mowing as soon as the weather begins cooling.
Should I Mow Fallen Leaves?
Absolutely, when conditions allow.
Fall mowing is not only about cutting grass. Your mower can also be useful for managing leaves.
A light to moderate layer of dry leaves can often be mulched directly into the lawn.
Repeatedly mowing over the leaves breaks them into smaller pieces that settle between the grass blades and decompose.
That returns organic material to the soil and can save you from bagging every leaf that falls.
There is an important limit, though.
If leaves become so thick that they completely cover the lawn, they should not simply be left in place. Heavy, wet layers of leaves can block sunlight, trap moisture, and smother the grass underneath.
For large accumulations, the lawn may need to be mulched several times or excess leaves may need to be removed as part of a fall cleanup.
Can I Mow Wet Grass in the Fall?
It is better to wait for the lawn to dry whenever possible.
Fall weather in Illinois can make that challenging. Cooler temperatures, morning dew, rain, and shorter days mean lawns often stay wet longer than they did during summer.
Mowing saturated ground can create ruts and soil compaction, particularly when using heavier equipment.
Wet grass also tends to clump rather than discharge evenly.
If the lawn is wet but mowing is necessary, waiting until later in the day can sometimes provide enough drying time for better conditions.
What If My Grass Is Still Growing in November?
Then it may still need to be mowed.
There is nothing wrong with mowing a northern Illinois lawn in November if temperatures remain mild and the grass continues growing.
This is especially important after a warm fall.
Stopping simply because October ended can leave the lawn excessively tall going into winter.
On the other hand, there is no benefit to mowing dormant grass simply because you traditionally mow every week.
As temperatures fall, your schedule should change from mowing on a fixed calendar to mowing as needed.
Your weekly mowing schedule might become every 10 days, then every two weeks, and eventually stop altogether.
Should I Bag Grass Clippings During the Final Mow?
Usually, no.
Normal grass clippings can generally be left on the lawn as long as you are mowing frequently enough that the clippings are small.
They break down and return nutrients to the soil.
The situation changes if you are dealing with excessive leaves, unusually long grass, disease problems, or large clumps of wet material.
If the mower is leaving piles that cover the turf, those piles should be spread out, remulched, or removed.
The goal is to avoid leaving anything on the lawn that can mat down and smother the grass over winter.
What Should I Do After the Final Mowing?
Once the grass has stopped growing and you have completed the final cut, take a few minutes to prepare both the lawn and your equipment for winter.
Make sure excessive leaves and debris have been removed from the property.
Avoid leaving piles of grass, leaves, branches, toys, hoses, or other items sitting on the turf throughout the winter.
This is also a good time to clean the underside of the mower deck and inspect the mower blade. A sharp blade will give you a cleaner cut when mowing season begins again in spring.
If you use battery-powered lawn equipment, follow the manufacturer's recommendations for winter battery storage. Gas-powered equipment should also be winterized according to the manufacturer's instructions.
A little work at the end of the season can make spring startup much easier.
When Is the Last Mow in Bourbonnais and Kankakee County?
For lawns around Bourbonnais, Bradley, Kankakee, Manteno, and surrounding Kankakee County communities, there is no exact date.
A typical fall may look something like this:
September: Grass is still actively growing and regular mowing usually continues.
October: Growth begins slowing. Mowing intervals often become longer as temperatures fall.
Late October into November: Watch the lawn rather than the calendar. When grass has stopped actively growing, complete the final mowing.
Weather can shift that timeline earlier or later from one year to the next.
The most important rule is to avoid stopping too soon simply because fall has arrived.
Don't Forget About Fall Lawn Cleanup
The final mow is only one part of preparing your property for winter.
Fall is also a good time to address:
Fallen leaves
Sticks and storm debris
Overgrown lawn edges
Compacted soil
Thin or damaged turf
Leaves collecting around landscaping
Debris accumulating along fences and buildings
Taking care of these issues before winter can make your property look better now and reduce the amount of cleanup needed when spring arrives.
If your soil is compacted, fall may also be an appropriate time to consider core aeration.
Professional Fall Lawn Care in Bourbonnais, Illinois
Knowing when to stop mowing sounds simple, but Illinois weather rarely follows a perfect schedule.
At The Lawn Care Company, we provide lawn mowing and seasonal property maintenance for homes and businesses in Bourbonnais, Bradley, Kankakee, Manteno, and nearby Kankakee County communities. Availability depends on your property location and our current routes.
Our services include:
Lawn mowing
Trimming
Edging
Yard cleanup
Seasonal cleanup
Core aeration
Whether you need regular lawn maintenance or help getting your property ready for winter, we can help keep your lawn looking clean and well maintained through the end of the season.
If your lawn is still growing, mowing season probably isn't over yet.
Request a fall lawn-care estimate from The Lawn Care Company for mowing, cleanup, or core aeration.
For more on preparing lawns for cold weather, see Illinois Extension’s winter lawn-care guidance.
Featured image: illustrative autumn lawn scene created with AI.
