Rockford, IL Lawn Care Calendar
In a typical year, put down crabgrass preventer in Rockford between Apr 19 and May 6. The best time to overseed is between Aug 7 and Sep 26. The last spring frost usually comes around Apr 27. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Rockford
| Task | Typical window |
|---|---|
| Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens. | Apr 19 – May 6 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Apr 29 – Jun 3 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Aug 7 – Sep 26 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Aug 24 – Nov 1 |
Median dates, 2016–2025, from NOAA weather data for Rockford. This year's dates can differ by a few weeks.
Month-by-month lawn care in Rockford
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchNo treatments due; mow as needed.
- AprilCrabgrass preventer (pre-emergent)Spring fertilizer
- MayCrabgrass preventer (pre-emergent)Spring fertilizer
- JuneSpring fertilizer
- JulyNo treatments due; mow as needed.
- AugustOverseeding & seedingFall fertilizer
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Rockford by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 23°F and peaks in July at 75°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 19.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 23°F | 25°F | 38°F | 47°F | 60°F | 71°F | 75°F | 73°F | 67°F | 55°F | 40°F | 29°F |
Rockford lawn timing, year by year
Over the last 10 years, soil in Rockford reached 50°F, the signal for crabgrass preventer, as early as Apr 6 (2021) and as late as May 8 (2022): 32 days apart. A fixed calendar date can't follow that, which is why the report above uses this year's soil temperature. Between the typical last spring frost (Apr 27) and first fall frost (Oct 21), the growing season lasts about 177 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 23 | Apr 16 | Oct 24 |
| 2024 | Apr 11 | Apr 25 | Oct 16 |
| 2023 | Apr 11 | Apr 26 | Oct 11 |
| 2022 | May 8 | Apr 27 | Oct 8 |
| 2021 | Apr 6 | Apr 22 | Oct 24 |
| 2020 | Apr 28 | May 9 | Oct 16 |
| 2019 | Apr 21 | Apr 29 | Oct 26 |
| 2018 | May 1 | Apr 29 | Oct 13 |
| 2017 | Apr 10 | Apr 7 | Oct 29 |
| 2016 | Apr 16 | May 15 | Nov 12 |
Estimated from daily temperatures for Rockford. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Rockford?
In a typical year, between Apr 19 and May 6. Put it down when soil reaches 50°F, before it stays above 55°F and crabgrass starts sprouting. Early springs move this up by a week or more, so check this year's soil temperature above.
When is the best time to plant grass seed in Rockford?
Early fall, typically Aug 7 – Sep 26, while soil cools from 65°F toward 50°F.
When is the last frost in Rockford?
The median last spring frost is Apr 27 and the median first fall frost is Oct 21 (2016–2025).
How long is the growing season in Rockford?
About 177 days, from the median last spring frost on Apr 27 to the median first fall frost on Oct 21 (2016–2025).
Lawn care guides
More Illinois lawn calendars
Nearby cities in other states
- Madison, WI 57 miles away · crabgrass preventer Apr 20 – May 16
- Milwaukee, WI 80 miles away · crabgrass preventer Apr 21 – May 22
- Davenport, IA 93 miles away · crabgrass preventer Apr 16 – Apr 27
- Iowa City, IA 132 miles away · crabgrass preventer Apr 16 – Apr 30