Last spring frost
Apr 3
Frost Dates for Ravensdale, WA
First fall frost
Nov 11
Growing season
219 days
Hardiness zone
8b
In an average year around Ravensdale, WA, the last spring frost (32°F) is about Apr 3 and the first fall frost is about Nov 11, giving roughly a 219-day growing season. To be safe most years, wait until Mar 7 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 19 | May 1 | Apr 11 |
| Freeze (32°F) | May 2 | Apr 3 | Mar 7 |
| Hard (28°F) | Apr 2 | Feb 28 | Jan 28 |
| Severe (24°F) | Feb 27 | Feb 1 | Dec 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 19 | May 12 | May 8 | May 4 | May 1 | Apr 28 | Apr 23 | Apr 17 | Apr 11 |
| 32°F | May 2 | Apr 26 | Apr 19 | Apr 11 | Apr 3 | Mar 30 | Mar 24 | Mar 17 | Mar 7 |
| 28°F | Apr 2 | Mar 19 | Mar 11 | Mar 4 | Feb 28 | Feb 24 | Feb 18 | Feb 8 | Jan 28 |
| 24°F | Feb 27 | Feb 21 | Feb 16 | Feb 9 | Feb 1 | Jan 25 | Jan 13 | Jan 3 | Dec 19 |
| 20°F | Feb 21 | Feb 12 | Feb 2 | Jan 26 | Jan 16 | Jan 5 | Dec 31 | Dec 14 | Dec 6 |
| 16°F | Feb 18 | Feb 7 | Jan 31 | Jan 19 | Jan 10 | Dec 30 | Dec 19 | Dec 10 | 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 6 | Oct 23 | Nov 9 |
| Freeze (32°F) | Oct 25 | Nov 11 | Dec 3 |
| Hard (28°F) | Nov 7 | Dec 1 | Jan 1 |
| Severe (24°F) | Nov 21 | Dec 19 | Feb 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 6 | Oct 13 | Oct 16 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Nov 3 | Nov 9 |
| 32°F | Oct 25 | Oct 31 | Nov 4 | Nov 7 | Nov 11 | Nov 15 | Nov 21 | Nov 26 | Dec 3 |
| 28°F | Nov 7 | Nov 13 | Nov 20 | Nov 26 | Dec 1 | Dec 5 | Dec 11 | Dec 19 | Jan 1 |
| 24°F | Nov 21 | Nov 30 | Dec 6 | Dec 11 | Dec 19 | Dec 31 | Jan 5 | Jan 17 | Feb 1 |
| 20°F | Nov 29 | Dec 4 | Dec 9 | Dec 18 | Dec 29 | Jan 6 | Jan 16 | Jan 29 | Feb 10 |
| 16°F | Dec 1 | Dec 6 | Dec 11 | Dec 20 | Dec 30 | Jan 13 | Jan 22 | Feb 1 | Feb 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: Palmer 3 Ese, Wa, about 3.1 miles away@if(!empty($station['elevation_ft'])), at 920 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 Ravensdale, WA?
On average, the last spring frost (32°F) around Ravensdale, WA is about Apr 3. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 7.
When is the first frost in the fall?
The first fall frost around Ravensdale, WA typically arrives about Nov 11. 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 3 on average, or Mar 7 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 219 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 98051 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026