Fall lawn fertilizer timing in the Midwest
Updated October 21, 2026. Live numbers refresh hourly.
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In the Midwest, give cool-season lawns about 1 pound of nitrogen per 1,000 sq ft in mid-September and a second round in late October or early November at the last mowing while grass is still green, as Iowa State and Purdue recommend; stop once soil falls below about 40°F or freezes. Today the 0–4 inch soil around Des Moines, IA averages 63°F and is warming.
- Soil today
- 63°F
- +14.5°F over 7 days
Live data for Des Moines, IA. Check your own ZIP below for local numbers.
Our picks
Chosen from the research below and the makers' own listings. We haven't lab-tested them.
- Best for most city lawns
Scotts Turf Builder EdgeGuard Mini Broadcast Spreader (76121B)
5,000sq ft per fill (Scotts)
A small walk-behind broadcast spreader is the easiest way to put down about 1 lb of nitrogen per 1,000 sq ft (Iowa State) evenly. This one covers a typical city lot in one fill and can block one side of its pattern along drives and walks.
- Best for big lawns
EarthWay 40 lb Residential Broadcast Spreader (2600A-Plus)
40 lbHopper (EarthWay)
On larger lots, a 40 lb hopper on pneumatic tires means fewer refills, and EarthWay's side-spread control does the same job as an edge guard along beds and sidewalks.
- Best for small yards and side strips
Scotts Whirl Hand-Powered Spreader (71074B)
1,500sq ft per fill (Scotts)
For a townhouse yard or a strip along the drive, a hand-crank spreader is enough, and it doubles as an ice-melt spreader in winter, per Scotts.
Side by side
| Pick | Best for | What it is | Holds | Assembly | Warranty | Retailer link |
|---|---|---|---|---|---|---|
| Scotts Turf Builder EdgeGuard Mini Broadcast Spreader (76121B) | Most city lawns | Walk-behind broadcast spreader | Up to 5,000 sq ft of Scotts product | Fully assembled, pre-calibrated | No mechanical warranty; 1-year satisfaction refund | Check price at Scotts |
| EarthWay 40 lb Residential Broadcast Spreader (2600A-Plus) | Big lawns | Walk-behind broadcast spreader | 40 lb hopper | Required | 1-year limited | Check price at EarthWay |
| Scotts Whirl Hand-Powered Spreader (71074B) | Small yards and side strips | Hand-crank broadcast spreader | Up to 1,500 sq ft of Scotts product | – | No mechanical warranty; 1-year satisfaction refund | Check price at Scotts |
Capacities, assembly and warranty terms are from each maker's product page. A dash means the maker doesn't list it.
Scotts Turf Builder EdgeGuard Mini Broadcast Spreader (76121B)
Best for most city lawns
A small walk-behind broadcast spreader is the easiest way to put down about 1 lb of nitrogen per 1,000 sq ft (Iowa State) evenly. This one covers a typical city lot in one fill and can block one side of its pattern along drives and walks.
Why we picked it
- Scotts says a full hopper covers up to 5,000 sq ft of Scotts product, sized for small to medium lawns.
- Ships fully assembled and pre-calibrated; the setting for each Scotts product is printed on the back of the bag.
- EdgeGuard blocks the right side of the spread pattern to keep product off sidewalks, driveways and beds (Scotts).
Downsides
- No mechanical warranty. Scotts backs it with a refund within one year if you're not satisfied.
- Settings are published for Scotts products. With another brand, look for a setting for this spreader on that bag.
- Larger lawns mean refilling; see the EarthWay below.
- What it is
- Walk-behind broadcast spreader
- Holds
- Up to 5,000 sq ft of Scotts product
- Assembly
- Fully assembled, pre-calibrated
- Edge control
- EdgeGuard (blocks right side)
- Warranty
- No mechanical warranty; 1-year satisfaction refund
- Model
- Scotts 76121B
EarthWay 40 lb Residential Broadcast Spreader (2600A-Plus)
Best for big lawns
On larger lots, a 40 lb hopper on pneumatic tires means fewer refills, and EarthWay's side-spread control does the same job as an edge guard along beds and sidewalks.
Why we picked it
- 40 lb rustproof poly hopper on an epoxy-coated chassis (EarthWay).
- EVEN-SPREAD three-hole drop system and side-spread control to protect sidewalks and garden beds.
- 9-inch pneumatic tires and solid-linkage rate control; a rate-setting matrix is included.
Downsides
- It needs assembly; EarthWay posts an assembly video and manual on the product page.
- A rain cover is sold separately (EarthWay part 77001).
- 1-year limited manufacturer defect warranty.
- What it is
- Walk-behind broadcast spreader
- Holds
- 40 lb hopper
- Assembly
- Required
- Edge control
- Side-spread control
- Tires
- 9 in pneumatic
- Warranty
- 1-year limited
- Model
- EarthWay 2600A-Plus
Scotts Whirl Hand-Powered Spreader (71074B)
Best for small yards and side strips
For a townhouse yard or a strip along the drive, a hand-crank spreader is enough, and it doubles as an ice-melt spreader in winter, per Scotts.
Why we picked it
- Scotts says it holds enough product for up to 1,500 sq ft, right-sized for a small lawn.
- Adjustable arm support, and an orange dial you set from the back of the Scotts bag.
- Scotts lists feeding, seeding and ice melt as its year-round jobs.
Downsides
- Scotts says combination weed or insect products get better results from a non-hand-crank broadcast spreader.
- You have to keep a steady walking and cranking rhythm for even coverage (Scotts).
- No mechanical warranty; Scotts offers a refund within one year if you're not satisfied.
- What it is
- Hand-crank broadcast spreader
- Holds
- Up to 1,500 sq ft of Scotts product
- Warranty
- No mechanical warranty; 1-year satisfaction refund
- Model
- Scotts 71074B
Why fall is the main event
Purdue's AY-13 calls mid-September the most important fertilization of the year for cool-season lawns. Iowa State says the September round promotes moderate shoot growth and thickens turf, while the late round at the last mowing promotes root growth and early green-up the next spring. Minnesota's program shifts earlier, with August and September applications, reflecting a shorter fall.
| Source | Main fall round | Late round |
|---|---|---|
| Purdue AY-13 | Mid-September (most important of the year) | After last mowing, while green; 1.0–1.25 lb soluble N |
| Iowa State | Mid-September, 1 lb N | Late Oct/early Nov at last mowing, 1 lb N |
| University of Minnesota | August and September | Early October for high-maintenance lawns with clippings removed |
Timing the late round by soil temperature
The late round depends on grass that's still green and roots that are still active. Purdue notes turf growth slows sharply once soil drops below about 40°F and that fertilizer shouldn't go on frozen soil. The live soil reading above, and on pages like Des Moines, Chicago and Columbus, shows when you're getting close. In a mild fall, the late round can slide into November; after an early cold snap, apply sooner.
- Sweep fertilizer off driveways and sidewalks; UMN warns it washes into lakes and streams.
- Only add phosphorus if a soil test calls for it (UMN).
- Water in after applying unless the label says otherwise.
- Fall is also the time for broadleaf weeds; see fall broadleaf control.
Is "winterizer" a special product?
In these extension programs the late round is about timing, not a special formula. Purdue specifies soluble nitrogen at 1.0–1.25 lb per 1,000 sq ft, and Iowa State simply says 1 lb of actual nitrogen. A bag labeled "winterizer" works if it supplies that nitrogen; check the first number on the analysis, which UMN explains is the nitrogen percentage.
Questions
When should I fertilize my lawn in the fall in Iowa?
Iowa State recommends mid-September and late October/early November, about 1 lb of actual nitrogen per 1,000 sq ft each time.
What is the most important lawn fertilization?
Purdue's AY-13 calls mid-September the most important application of the year for cool-season lawns.
Is it too late to fertilize in November?
Not if grass is still green and soil isn't frozen. Purdue notes growth slows below about 40°F soil.
Bottom line
Make mid-September your main feeding and add a late round at the last mowing while grass is still green, about 1 lb of nitrogen per 1,000 sq ft each time (Iowa State, Purdue). Spread with an edge guard or side-spread control on, and sweep any granules off pavement so they don't wash into lakes and streams (UMN).
Check price at ScottsScotts Turf Builder EdgeGuard Mini Broadcast Spreader (76121B)
Sources
- Purdue Extension AY-13: Lawn Improvement Programs
- Iowa State University Extension: When should I fertilize the lawn in the fall?
- University of Minnesota Extension: Fertilizing lawns
- Purdue University: Fall fertilization for home lawns
- Scotts: Turf Builder EdgeGuard Mini Broadcast Spreader (76121B) product page
- EarthWay: 40 lb Residential Broadcast Spreader (2600A-Plus) product page
- Scotts: Whirl Hand-Powered Spreader (71074B) product page
Soil temperatures: NOAA GFS model, 0–10 cm layer. Snow: NOAA and National Weather Service. See how we measure.