Coeur d'Alene, ID Lawn Care Calendar
In a typical year, put down crabgrass preventer in Coeur d'Alene between Apr 27 and May 18. The best time to overseed is between Aug 7 and Sep 26. The last spring frost usually comes around Apr 23. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Coeur d'Alene
| 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 27 – May 18 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | May 11 – Jun 15 |
| 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 17 – Oct 31 |
Median dates, 2016–2025, from NOAA weather data for Coeur d'Alene. This year's dates can differ by a few weeks.
Month-by-month lawn care in Coeur d'Alene
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchNo treatments due; mow as needed.
- AprilCrabgrass preventer (pre-emergent)
- MayCrabgrass preventer (pre-emergent)Spring fertilizer
- JuneSpring fertilizer
- JulyNo treatments due; mow as needed.
- AugustOverseeding & seedingFall fertilizer
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberNo treatments due; mow as needed.
- DecemberNo treatments due; mow as needed.
Soil temperature in Coeur d'Alene by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 31°F and peaks in August at 72°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 27.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31°F | 32°F | 39°F | 46°F | 56°F | 63°F | 71°F | 72°F | 63°F | 50°F | 39°F | 32°F |
Coeur d'Alene lawn timing, year by year
Over the last 10 years, soil in Coeur d'Alene reached 50°F, the signal for crabgrass preventer, as early as Apr 8 (2016) and as late as May 24 (2022): 46 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 23) and first fall frost (Oct 21), the growing season lasts about 181 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 26 | Apr 24 | Oct 17 |
| 2024 | May 10 | Apr 23 | Nov 6 |
| 2023 | Apr 28 | Apr 21 | Oct 24 |
| 2022 | May 24 | Apr 28 | Nov 5 |
| 2021 | Apr 29 | Apr 22 | Oct 11 |
| 2020 | Apr 25 | Apr 17 | Oct 23 |
| 2019 | Apr 22 | Apr 30 | Oct 2 |
| 2018 | Apr 26 | Apr 24 | Oct 11 |
| 2017 | May 4 | Apr 17 | Oct 31 |
| 2016 | Apr 8 | Mar 31 | Oct 12 |
Estimated from daily temperatures for Coeur d'Alene. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Coeur d'Alene?
In a typical year, between Apr 27 and May 18. 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 Coeur d'Alene?
Early fall, typically Aug 7 – Sep 26, while soil cools from 65°F toward 50°F.
When is the last frost in Coeur d'Alene?
The median last spring frost is Apr 23 and the median first fall frost is Oct 21 (2016–2025).
How long is the growing season in Coeur d'Alene?
About 181 days, from the median last spring frost on Apr 23 to the median first fall frost on Oct 21 (2016–2025).
Lawn care guides
More Idaho lawn calendars
Nearby cities in other states
- Spokane, WA 30 miles away · crabgrass preventer Apr 26 – May 15
- Missoula, MT 142 miles away · crabgrass preventer May 10 – May 27
- Kennewick, WA 151 miles away · crabgrass preventer Mar 31 – May 3
- Yakima, WA 191 miles away · crabgrass preventer Apr 18 – May 6