Olathe, KS Lawn Care Calendar
In a typical year, put down crabgrass preventer in Olathe between Mar 21 and Apr 19. The best time to overseed is between Aug 14 and Oct 3. The last spring frost usually comes around Apr 12. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Olathe
| Task | Typical window |
|---|---|
| Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens. | Mar 21 – Apr 19 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Apr 12 – May 17 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Aug 14 – Oct 3 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Sep 18 – Nov 11 |
Median dates, 2016–2025, from NOAA weather data for Olathe. This year's dates can differ by a few weeks.
Month-by-month lawn care in Olathe
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchCrabgrass preventer (pre-emergent)
- 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
- OctoberOverseeding & seedingFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Olathe by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 30°F and peaks in July at 79°F. Crabgrass preventer goes down when it reaches 50°F, usually around Mar 21.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30°F | 34°F | 45°F | 54°F | 64°F | 76°F | 79°F | 77°F | 72°F | 59°F | 46°F | 36°F |
Olathe lawn timing, year by year
Over the last 10 years, soil in Olathe reached 50°F, the signal for crabgrass preventer, as early as Feb 19 (2017) and as late as Apr 23 (2018): 63 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 12) and first fall frost (Oct 28), the growing season lasts about 199 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Mar 12 | Apr 9 | Nov 2 |
| 2024 | Mar 13 | Mar 28 | Oct 16 |
| 2023 | Apr 3 | Apr 23 | Oct 28 |
| 2022 | Apr 11 | Apr 10 | Oct 18 |
| 2021 | Mar 9 | Apr 22 | Nov 3 |
| 2020 | Mar 27 | Apr 18 | Oct 26 |
| 2019 | Apr 6 | Apr 13 | Oct 12 |
| 2018 | Apr 23 | Apr 17 | Oct 15 |
| 2017 | Feb 19 | Mar 16 | Oct 28 |
| 2016 | Mar 7 | Apr 9 | Nov 13 |
Estimated from daily temperatures for Olathe. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Olathe?
In a typical year, between Mar 21 and Apr 19. 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 Olathe?
Early fall, typically Aug 14 – Oct 3, while soil cools from 65°F toward 50°F.
When is the last frost in Olathe?
The median last spring frost is Apr 12 and the median first fall frost is Oct 28 (2016–2025).
How long is the growing season in Olathe?
About 199 days, from the median last spring frost on Apr 12 to the median first fall frost on Oct 28 (2016–2025).
Lawn care guides
More Kansas lawn calendars
Nearby cities in other states
- Kansas City, MO 20 miles away · crabgrass preventer Mar 20 – Apr 16
- Joplin, MO 126 miles away · crabgrass preventer Mar 11 – Apr 13
- Columbia, MO 134 miles away · crabgrass preventer Mar 15 – Apr 17
- Springfield, MO 142 miles away · crabgrass preventer Mar 18 – Apr 18