Last spring frost
Mar 29
Frost Dates for Aberdeen, WA
First fall frost
Nov 15
Growing season
234 days
Hardiness zone
8b
In an average year around Aberdeen, WA, the last spring frost (32°F) is about Mar 29 and the first fall frost is about Nov 15, giving roughly a 234-day growing season. To be safe most years, wait until Feb 25 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 11 | Apr 23 | Apr 4 |
| Freeze (32°F) | Apr 20 | Mar 29 | Feb 25 |
| Hard (28°F) | Mar 20 | Feb 18 | Dec 27 |
| Severe (24°F) | Feb 20 | Jan 5 | Dec 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 11 | May 5 | Apr 30 | Apr 27 | Apr 23 | Apr 19 | Apr 15 | Apr 10 | Apr 4 |
| 32°F | Apr 20 | Apr 12 | Apr 5 | Apr 1 | Mar 29 | Mar 23 | Mar 15 | Mar 6 | Feb 25 |
| 28°F | Mar 20 | Mar 7 | Feb 28 | Feb 24 | Feb 18 | Feb 10 | Jan 31 | Jan 16 | Dec 27 |
| 24°F | Feb 20 | Feb 10 | Jan 29 | Jan 14 | Jan 5 | Dec 29 | Dec 20 | Dec 11 | Dec 2 |
| 20°F | Jan 14 | Jan 1 | Dec 31 | Dec 23 | Dec 20 | Dec 16 | Dec 11 | Dec 7 | Dec 1 |
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 11 | Oct 27 | Nov 14 |
| Freeze (32°F) | Oct 27 | Nov 15 | Dec 10 |
| Hard (28°F) | Nov 11 | Dec 6 | Jan 26 |
| Severe (24°F) | Nov 26 | Dec 19 | Feb 8 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 11 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 2 | Nov 7 | Nov 14 |
| 32°F | Oct 27 | Nov 1 | Nov 6 | Nov 11 | Nov 15 | Nov 21 | Nov 26 | Dec 1 | Dec 10 |
| 28°F | Nov 11 | Nov 21 | Nov 27 | Dec 1 | Dec 6 | Dec 13 | Dec 23 | Jan 2 | Jan 26 |
| 24°F | Nov 26 | Dec 1 | Dec 7 | Dec 13 | Dec 19 | Dec 27 | Jan 4 | Jan 16 | Feb 8 |
| 20°F | Dec 1 | Dec 5 | Dec 9 | Dec 12 | Dec 17 | Dec 20 | Dec 28 | Jan 1 | Jan 10 |
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: Aberdeen, Wa, about 1.6 miles away@if(!empty($station['elevation_ft'])), at 10 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 Aberdeen, WA?
On average, the last spring frost (32°F) around Aberdeen, WA is about Mar 29. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 25.
When is the first frost in the fall?
The first fall frost around Aberdeen, WA typically arrives about Nov 15. 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 Feb 25 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 234 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 98520 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026