Last spring frost
Apr 22
Frost Dates for Coeur d'Alene, ID
First fall frost
Oct 18
Growing season
179 days
Hardiness zone
6b
In an average year around Coeur d'Alene, ID, the last spring frost (32°F) is about Apr 22 and the first fall frost is about Oct 18, giving roughly a 179-day growing season. To be safe most years, wait until Apr 4 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 21 | May 7 | Apr 25 |
| Freeze (32°F) | May 6 | Apr 22 | Apr 4 |
| Hard (28°F) | Apr 21 | Apr 1 | Mar 13 |
| Severe (24°F) | Mar 29 | Mar 12 | Feb 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 21 | May 15 | May 12 | May 9 | May 7 | May 4 | May 1 | Apr 29 | Apr 25 |
| 32°F | May 6 | May 2 | Apr 29 | Apr 26 | Apr 22 | Apr 19 | Apr 14 | Apr 10 | Apr 4 |
| 28°F | Apr 21 | Apr 13 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 24 | Mar 20 | Mar 13 |
| 24°F | Mar 29 | Mar 22 | Mar 19 | Mar 15 | Mar 12 | Mar 8 | Mar 5 | Mar 1 | Feb 23 |
| 20°F | Mar 16 | Mar 12 | Mar 8 | Mar 4 | Mar 1 | Feb 26 | Feb 21 | Feb 14 | Feb 3 |
| 16°F | Mar 9 | Mar 3 | Feb 28 | Feb 22 | Feb 15 | Feb 9 | Feb 2 | Jan 22 | Jan 5 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 23 | Oct 6 | Oct 21 |
| Freeze (32°F) | Oct 4 | Oct 18 | Nov 5 |
| Hard (28°F) | Oct 15 | Nov 1 | Nov 20 |
| Severe (24°F) | Oct 24 | Nov 13 | Dec 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 23 | Sep 28 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 12 | Oct 16 | Oct 21 |
| 32°F | Oct 4 | Oct 8 | Oct 12 | Oct 15 | Oct 18 | Oct 22 | Oct 25 | Oct 30 | Nov 5 |
| 28°F | Oct 15 | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 8 | Nov 12 | Nov 20 |
| 24°F | Oct 24 | Nov 1 | Nov 6 | Nov 9 | Nov 13 | Nov 18 | Nov 22 | Nov 26 | Dec 2 |
| 20°F | Nov 2 | Nov 10 | Nov 17 | Nov 23 | Nov 26 | Nov 30 | Dec 4 | Dec 11 | Dec 23 |
| 16°F | Nov 15 | Nov 25 | Nov 30 | Dec 4 | Dec 8 | Dec 16 | Dec 23 | Dec 30 | Jan 12 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Coeur D'alene, Id, about 3.1 miles away@if(!empty($station['elevation_ft'])), at 2,133 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Coeur d'Alene, ID?
On average, the last spring frost (32°F) around Coeur d'Alene, ID is about Apr 22. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 4.
When is the first frost in the fall?
The first fall frost around Coeur d'Alene, ID typically arrives about Oct 18. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 22 on average, or Apr 4 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 179 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 83815 Planting calendar → Idaho frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026