Last spring frost
Apr 6
Frost Dates for Roosevelt, WA
First fall frost
Oct 21
Growing season
196 days
Hardiness zone
7a
In an average year around Roosevelt, WA, the last spring frost (32°F) is about Apr 6 and the first fall frost is about Oct 21, giving roughly a 196-day growing season. To be safe most years, wait until Mar 22 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 10 | Apr 27 | Apr 9 |
| Freeze (32°F) | Apr 28 | Apr 6 | Mar 22 |
| Hard (28°F) | Apr 8 | Mar 19 | Mar 1 |
| Severe (24°F) | Mar 20 | Mar 1 | Feb 8 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 10 | May 5 | May 2 | Apr 29 | Apr 27 | Apr 24 | Apr 20 | Apr 15 | Apr 9 |
| 32°F | Apr 28 | Apr 21 | Apr 16 | Apr 11 | Apr 6 | Apr 3 | Mar 31 | Mar 27 | Mar 22 |
| 28°F | Apr 8 | Apr 1 | Mar 27 | Mar 23 | Mar 19 | Mar 14 | Mar 10 | Mar 6 | Mar 1 |
| 24°F | Mar 20 | Mar 13 | Mar 8 | Mar 4 | Mar 1 | Feb 27 | Feb 23 | Feb 16 | Feb 8 |
| 20°F | Mar 4 | Feb 28 | Feb 24 | Feb 19 | Feb 14 | Feb 8 | Jan 31 | Jan 15 | Jan 4 |
| 16°F | Feb 26 | Feb 18 | Feb 11 | Feb 4 | Jan 26 | Jan 15 | Jan 8 | Dec 31 | Dec 11 |
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 29 | Oct 11 | Oct 25 |
| Freeze (32°F) | Oct 6 | Oct 21 | Nov 7 |
| Hard (28°F) | Oct 18 | Nov 3 | Nov 22 |
| Severe (24°F) | Oct 26 | Nov 17 | Dec 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 29 | Oct 3 | Oct 5 | Oct 8 | Oct 11 | Oct 14 | Oct 16 | Oct 19 | Oct 25 |
| 32°F | Oct 6 | Oct 11 | Oct 15 | Oct 18 | Oct 21 | Oct 25 | Oct 28 | Nov 1 | Nov 7 |
| 28°F | Oct 18 | Oct 23 | Oct 27 | Oct 30 | Nov 3 | Nov 6 | Nov 10 | Nov 15 | Nov 22 |
| 24°F | Oct 26 | Nov 1 | Nov 6 | Nov 12 | Nov 17 | Nov 22 | Nov 26 | Dec 1 | Dec 12 |
| 20°F | Nov 4 | Nov 13 | Nov 22 | Nov 28 | Dec 3 | Dec 9 | Dec 18 | Dec 31 | Jan 12 |
| 16°F | Nov 13 | Nov 27 | Dec 4 | Dec 9 | Dec 17 | Dec 27 | Jan 3 | Jan 12 | Jan 29 |
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: Arlington, Or, about 10.5 miles away@if(!empty($station['elevation_ft'])), at 277 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 Roosevelt, WA?
On average, the last spring frost (32°F) around Roosevelt, WA is about Apr 6. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 22.
When is the first frost in the fall?
The first fall frost around Roosevelt, WA typically arrives about Oct 21. 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 6 on average, or Mar 22 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 196 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 99356 Planting calendar → Washington frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026