Joliet, IL Lawn Care Calendar
In a typical year, put down crabgrass preventer in Joliet between Apr 18 and May 1. The best time to overseed is between Aug 13 and Oct 2. The last spring frost usually comes around Apr 24. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Joliet
| 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 18 – May 1 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Apr 24 – May 29 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Aug 13 – Oct 2 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Sep 8 – Nov 1 |
Median dates, 2016–2025, from NOAA weather data for Joliet. This year's dates can differ by a few weeks.
Month-by-month lawn care in Joliet
- 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
- JuneNo treatments due; mow as needed.
- JulyNo treatments due; mow as needed.
- AugustOverseeding & seeding
- SeptemberOverseeding & seedingFall fertilizer
- OctoberOverseeding & seedingFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Joliet by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 25°F and peaks in July at 75°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 18.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25°F | 28°F | 40°F | 48°F | 60°F | 71°F | 75°F | 73°F | 68°F | 56°F | 41°F | 31°F |
Joliet lawn timing, year by year
Over the last 10 years, soil in Joliet 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 24) and first fall frost (Oct 27), the growing season lasts about 186 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 18 | Apr 16 | Oct 24 |
| 2024 | Apr 11 | Apr 25 | Oct 17 |
| 2023 | Apr 11 | Apr 18 | Oct 30 |
| 2022 | May 8 | Apr 27 | Oct 8 |
| 2021 | Apr 6 | Apr 22 | Nov 1 |
| 2020 | Apr 29 | May 9 | Oct 16 |
| 2019 | Apr 21 | Apr 28 | Oct 31 |
| 2018 | May 1 | Apr 29 | Oct 16 |
| 2017 | Apr 10 | Apr 2 | Nov 7 |
| 2016 | Apr 17 | Apr 13 | Nov 12 |
Estimated from daily temperatures for Joliet. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Joliet?
In a typical year, between Apr 18 and May 1. 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 Joliet?
Early fall, typically Aug 13 – Oct 2, while soil cools from 65°F toward 50°F.
When is the last frost in Joliet?
The median last spring frost is Apr 24 and the median first fall frost is Oct 27 (2016–2025).
How long is the growing season in Joliet?
About 186 days, from the median last spring frost on Apr 24 to the median first fall frost on Oct 27 (2016–2025).
Lawn care guides
More Illinois lawn calendars
Nearby cities in other states
- South Bend, IN 95 miles away · crabgrass preventer Apr 19 – May 8
- Milwaukee, WI 105 miles away · crabgrass preventer Apr 21 – May 22
- Madison, WI 126 miles away · crabgrass preventer Apr 20 – May 16
- Davenport, IA 129 miles away · crabgrass preventer Apr 16 – Apr 27