Last spring frost
Apr 24
Frost Dates for Upper Elochoman, WA
First fall frost
Oct 24
Growing season
184 days
Hardiness zone
8b
In an average year around Upper Elochoman, WA, the last spring frost (32°F) is about Apr 24 and the first fall frost is about Oct 24, giving roughly a 184-day growing season. To be safe most years, wait until Mar 31 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 30 | May 11 | Apr 24 |
| Freeze (32°F) | May 9 | Apr 24 | Mar 31 |
| Hard (28°F) | Apr 20 | Mar 25 | Feb 25 |
| Severe (24°F) | Mar 18 | Feb 20 | Jan 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 30 | May 24 | May 19 | May 15 | May 11 | May 7 | May 4 | Apr 30 | Apr 24 |
| 32°F | May 9 | May 4 | May 1 | Apr 28 | Apr 24 | Apr 19 | Apr 14 | Apr 8 | Mar 31 |
| 28°F | Apr 20 | Apr 9 | Apr 4 | Mar 30 | Mar 25 | Mar 18 | Mar 12 | Mar 4 | Feb 25 |
| 24°F | Mar 18 | Mar 8 | Feb 28 | Feb 25 | Feb 20 | Feb 15 | Feb 6 | Jan 23 | Jan 3 |
| 20°F | Feb 26 | Feb 19 | Feb 13 | Feb 2 | Jan 22 | Jan 8 | Jan 1 | Dec 19 | Dec 6 |
| 16°F | Feb 18 | Feb 9 | Jan 26 | Jan 10 | Jan 1 | Dec 24 | Dec 14 | Dec 7 | Nov 29 |
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 24 | Oct 7 | Oct 27 |
| Freeze (32°F) | Oct 5 | Oct 24 | Nov 12 |
| Hard (28°F) | Oct 20 | Nov 9 | Dec 4 |
| Severe (24°F) | Nov 3 | Nov 30 | Jan 5 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 24 | Sep 29 | Oct 2 | Oct 4 | Oct 7 | Oct 10 | Oct 14 | Oct 19 | Oct 27 |
| 32°F | Oct 5 | Oct 9 | Oct 15 | Oct 20 | Oct 24 | Oct 27 | Nov 1 | Nov 6 | Nov 12 |
| 28°F | Oct 20 | Oct 26 | Oct 30 | Nov 5 | Nov 9 | Nov 14 | Nov 20 | Nov 26 | Dec 4 |
| 24°F | Nov 3 | Nov 11 | Nov 19 | Nov 24 | Nov 30 | Dec 5 | Dec 13 | Dec 23 | Jan 5 |
| 20°F | Nov 18 | Nov 29 | Dec 5 | Dec 11 | Dec 19 | Dec 29 | Jan 5 | Jan 21 | Feb 12 |
| 16°F | Nov 24 | Dec 3 | Dec 8 | Dec 15 | Dec 25 | Jan 1 | Jan 8 | Jan 26 | Feb 13 |
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: Clatskanie, Or, about 10.6 miles away@if(!empty($station['elevation_ft'])), at 22 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 Upper Elochoman, WA?
On average, the last spring frost (32°F) around Upper Elochoman, WA is about Apr 24. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 31.
When is the first frost in the fall?
The first fall frost around Upper Elochoman, WA typically arrives about Oct 24. 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 24 on average, or Mar 31 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 184 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 98612 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026