Last spring frost
May 12
Frost Dates for Cusick, WA
First fall frost
Sep 21
Growing season
130 days
Hardiness zone
6a
In an average year around Cusick, WA, the last spring frost (32°F) is about May 12 and the first fall frost is about Sep 21, giving roughly a 130-day growing season. To be safe most years, wait until Apr 28 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) | Jun 26 | Jun 1 | May 14 |
| Freeze (32°F) | May 29 | May 12 | Apr 28 |
| Hard (28°F) | May 14 | Apr 30 | Apr 13 |
| Severe (24°F) | May 2 | Apr 10 | Mar 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 26 | Jun 16 | Jun 10 | Jun 5 | Jun 1 | May 29 | May 25 | May 19 | May 14 |
| 32°F | May 29 | May 23 | May 18 | May 14 | May 12 | May 9 | May 6 | May 3 | Apr 28 |
| 28°F | May 14 | May 9 | May 6 | May 3 | Apr 30 | Apr 27 | Apr 23 | Apr 19 | Apr 13 |
| 24°F | May 2 | Apr 26 | Apr 20 | Apr 16 | Apr 10 | Apr 5 | Mar 31 | Mar 28 | Mar 19 |
| 20°F | Apr 9 | Apr 1 | Mar 29 | Mar 24 | Mar 19 | Mar 15 | Mar 10 | Mar 5 | Feb 28 |
| 16°F | Mar 21 | Mar 15 | Mar 10 | Mar 7 | Mar 4 | Mar 1 | Feb 26 | Feb 20 | Feb 10 |
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) | Aug 24 | Sep 6 | Sep 21 |
| Freeze (32°F) | Sep 5 | Sep 21 | Oct 5 |
| Hard (28°F) | Sep 18 | Oct 2 | Oct 26 |
| Severe (24°F) | Sep 30 | Oct 22 | Nov 14 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 24 | Aug 30 | Sep 1 | Sep 4 | Sep 6 | Sep 9 | Sep 12 | Sep 16 | Sep 21 |
| 32°F | Sep 5 | Sep 10 | Sep 15 | Sep 18 | Sep 21 | Sep 24 | Sep 27 | Oct 1 | Oct 5 |
| 28°F | Sep 18 | Sep 23 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 10 | Oct 18 | Oct 26 |
| 24°F | Sep 30 | Oct 4 | Oct 8 | Oct 15 | Oct 22 | Oct 27 | Nov 1 | Nov 6 | Nov 14 |
| 20°F | Oct 7 | Oct 19 | Oct 27 | Nov 2 | Nov 6 | Nov 11 | Nov 16 | Nov 22 | Nov 29 |
| 16°F | Oct 21 | Nov 2 | Nov 9 | Nov 14 | Nov 19 | Nov 24 | Nov 29 | Dec 5 | Dec 16 |
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: Newport, Wa, about 14.6 miles away@if(!empty($station['elevation_ft'])), at 2,162 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 Cusick, WA?
On average, the last spring frost (32°F) around Cusick, WA is about May 12. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 28.
When is the first frost in the fall?
The first fall frost around Cusick, WA typically arrives about Sep 21. 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 May 12 on average, or Apr 28 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 130 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 99180 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026