Champaign, IL Lawn Care Calendar
In a typical year, put down crabgrass preventer in Champaign between Apr 10 and Apr 26. The best time to overseed is between Aug 6 and Sep 25. The last spring frost usually comes around Apr 22. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Champaign
| 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 10 – Apr 26 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Apr 19 – May 24 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Aug 6 – Sep 25 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Sep 3 – Nov 5 |
Median dates, 2016–2025, from NOAA weather data for Champaign. This year's dates can differ by a few weeks.
Month-by-month lawn care in Champaign
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchNo treatments due; mow as needed.
- AprilCrabgrass preventer (pre-emergent)Spring fertilizer
- MaySpring fertilizer
- JuneNo treatments due; mow as needed.
- JulyNo treatments due; mow as needed.
- AugustOverseeding & seeding
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Champaign by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 27°F and peaks in July at 75°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 10.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 27°F | 30°F | 41°F | 51°F | 63°F | 73°F | 75°F | 73°F | 69°F | 58°F | 42°F | 33°F |
Champaign lawn timing, year by year
Over the last 10 years, soil in Champaign reached 50°F, the signal for crabgrass preventer, as early as Feb 21 (2017) and as late as Apr 24 (2020): 62 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 22) and first fall frost (Oct 20), the growing season lasts about 181 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 14 | Apr 12 | Oct 23 |
| 2024 | Apr 9 | Apr 25 | Oct 16 |
| 2023 | Apr 9 | Apr 24 | Oct 31 |
| 2022 | Apr 22 | Apr 20 | Oct 8 |
| 2021 | Apr 6 | Apr 23 | Nov 1 |
| 2020 | Apr 24 | May 9 | Oct 5 |
| 2019 | Apr 8 | Apr 15 | Oct 12 |
| 2018 | Apr 23 | Apr 29 | Oct 12 |
| 2017 | Feb 21 | Mar 24 | Nov 1 |
| 2016 | Mar 14 | Apr 13 | Nov 12 |
Estimated from daily temperatures for Champaign. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Champaign?
In a typical year, between Apr 10 and Apr 26. 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 Champaign?
Early fall, typically Aug 6 – Sep 25, while soil cools from 65°F toward 50°F.
When is the last frost in Champaign?
The median last spring frost is Apr 22 and the median first fall frost is Oct 20 (2016–2025).
How long is the growing season in Champaign?
About 181 days, from the median last spring frost on Apr 22 to the median first fall frost on Oct 20 (2016–2025).
Lawn care guides
More Illinois lawn calendars
Nearby cities in other states
- Bloomington, IN 112 miles away · crabgrass preventer Apr 1 – Apr 24
- Carmel, IN 113 miles away · crabgrass preventer Apr 11 – Apr 26
- Indianapolis, IN 113 miles away · crabgrass preventer Mar 30 – Apr 22
- St. Louis, MO 147 miles away · crabgrass preventer Mar 15 – Apr 16