Last spring frost
Mar 29
Frost Dates for Seabeck, WA
First fall frost
Nov 14
Growing season
227 days
Hardiness zone
8b
In an average year around Seabeck, WA, the last spring frost (32°F) is about Mar 29 and the first fall frost is about Nov 14, giving roughly a 227-day growing season. To be safe most years, wait until Mar 5 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 13 | Apr 25 | Apr 7 |
| Freeze (32°F) | Apr 24 | Mar 29 | Mar 5 |
| Hard (28°F) | Mar 27 | Feb 27 | Jan 24 |
| Severe (24°F) | Feb 24 | Jan 26 | Dec 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 13 | May 6 | May 2 | Apr 29 | Apr 25 | Apr 21 | Apr 17 | Apr 13 | Apr 7 |
| 32°F | Apr 24 | Apr 15 | Apr 7 | Apr 2 | Mar 29 | Mar 25 | Mar 20 | Mar 13 | Mar 5 |
| 28°F | Mar 27 | Mar 17 | Mar 9 | Mar 1 | Feb 27 | Feb 23 | Feb 16 | Feb 10 | Jan 24 |
| 24°F | Feb 24 | Feb 18 | Feb 13 | Feb 5 | Jan 26 | Jan 11 | Jan 2 | Dec 24 | Dec 9 |
| 20°F | Feb 16 | Feb 9 | Jan 29 | Jan 7 | Dec 31 | Dec 22 | Dec 13 | Dec 7 | Dec 2 |
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) | Oct 4 | Oct 27 | Nov 13 |
| Freeze (32°F) | Oct 26 | Nov 14 | Dec 1 |
| Hard (28°F) | Nov 10 | Nov 30 | Dec 24 |
| Severe (24°F) | Nov 23 | Dec 15 | Feb 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 13 | Oct 18 | Oct 23 | Oct 27 | Oct 30 | Nov 4 | Nov 8 | Nov 13 |
| 32°F | Oct 26 | Nov 2 | Nov 7 | Nov 10 | Nov 14 | Nov 17 | Nov 21 | Nov 25 | Dec 1 |
| 28°F | Nov 10 | Nov 17 | Nov 23 | Nov 26 | Nov 30 | Dec 3 | Dec 8 | Dec 16 | Dec 24 |
| 24°F | Nov 23 | Nov 28 | Dec 3 | Dec 8 | Dec 15 | Dec 23 | Dec 30 | Jan 7 | Feb 1 |
| 20°F | Nov 27 | Dec 3 | Dec 6 | Dec 11 | Dec 18 | Dec 25 | Jan 1 | Jan 23 | Feb 9 |
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: Bremerton, Wa, about 9.4 miles away@if(!empty($station['elevation_ft'])), at 110 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 Seabeck, WA?
On average, the last spring frost (32°F) around Seabeck, WA is about Mar 29. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 5.
When is the first frost in the fall?
The first fall frost around Seabeck, WA typically arrives about Nov 14. 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 Mar 29 on average, or Mar 5 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 227 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 98380 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026