Last spring frost
Apr 29
Frost Dates for Washougal, WA
First fall frost
Oct 22
Growing season
177 days
Hardiness zone
8b
In an average year around Washougal, WA, the last spring frost (32°F) is about Apr 29 and the first fall frost is about Oct 22, giving roughly a 177-day growing season. To be safe most years, wait until Apr 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) | Jun 3 | May 15 | Apr 30 |
| Freeze (32°F) | May 15 | Apr 29 | Apr 5 |
| Hard (28°F) | May 2 | Mar 28 | Feb 24 |
| Severe (24°F) | Mar 28 | Feb 20 | Dec 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 3 | May 29 | May 24 | May 20 | May 15 | May 12 | May 9 | May 6 | Apr 30 |
| 32°F | May 15 | May 9 | May 5 | May 2 | Apr 29 | Apr 26 | Apr 21 | Apr 15 | Apr 5 |
| 28°F | May 2 | Apr 22 | Apr 13 | Apr 1 | Mar 28 | Mar 23 | Mar 17 | Mar 5 | Feb 24 |
| 24°F | Mar 28 | Mar 13 | Mar 2 | Feb 26 | Feb 20 | Feb 13 | Feb 2 | Jan 18 | Dec 28 |
| 20°F | Feb 27 | Feb 20 | Feb 14 | Feb 6 | Jan 25 | Jan 13 | Jan 1 | Dec 22 | Dec 8 |
| 16°F | Feb 20 | Feb 14 | Feb 6 | Jan 27 | Jan 18 | Jan 5 | Dec 26 | Dec 14 | Dec 4 |
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 2 | Oct 1 | Oct 20 |
| Freeze (32°F) | Sep 27 | Oct 22 | Nov 15 |
| Hard (28°F) | Oct 18 | Nov 14 | Dec 14 |
| Severe (24°F) | Nov 2 | Dec 5 | Jan 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 2 | Sep 12 | Sep 19 | Sep 26 | Oct 1 | Oct 3 | Oct 7 | Oct 13 | Oct 20 |
| 32°F | Sep 27 | Oct 4 | Oct 10 | Oct 16 | Oct 22 | Oct 26 | Oct 31 | Nov 6 | Nov 15 |
| 28°F | Oct 18 | Oct 27 | Nov 1 | Nov 7 | Nov 14 | Nov 20 | Nov 28 | Dec 5 | Dec 14 |
| 24°F | Nov 2 | Nov 13 | Nov 22 | Nov 29 | Dec 5 | Dec 13 | Dec 21 | Dec 29 | Jan 10 |
| 20°F | Nov 18 | Dec 1 | Dec 9 | Dec 17 | Dec 25 | Dec 31 | Jan 9 | Jan 27 | Feb 16 |
| 16°F | Nov 27 | Dec 6 | Dec 14 | Dec 22 | Jan 1 | Jan 10 | Jan 22 | Feb 4 | Feb 15 |
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: Skamania Fish Hatchery, Wa, about 2.9 miles away@if(!empty($station['elevation_ft'])), at 435 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 Washougal, WA?
On average, the last spring frost (32°F) around Washougal, WA is about Apr 29. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 5.
When is the first frost in the fall?
The first fall frost around Washougal, WA typically arrives about Oct 22. 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 29 on average, or Apr 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 177 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 98671 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026