Last spring frost
Apr 24
Frost Dates for Westfir, OR
First fall frost
Oct 24
Growing season
183 days
Hardiness zone
8b
In an average year around Westfir, OR, the last spring frost (32°F) is about Apr 24 and the first fall frost is about Oct 24, giving roughly a 183-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) | Jun 2 | May 12 | Apr 26 |
| Freeze (32°F) | May 11 | Apr 24 | Mar 31 |
| Hard (28°F) | Apr 18 | Mar 22 | Feb 22 |
| Severe (24°F) | Mar 12 | Feb 12 | Dec 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 2 | May 26 | May 20 | May 16 | May 12 | May 9 | May 6 | May 2 | Apr 26 |
| 32°F | May 11 | May 5 | May 1 | Apr 29 | Apr 24 | Apr 19 | Apr 13 | Apr 6 | Mar 31 |
| 28°F | Apr 18 | Apr 7 | Mar 31 | Mar 27 | Mar 22 | Mar 16 | Mar 9 | Mar 1 | Feb 22 |
| 24°F | Mar 12 | Mar 1 | Feb 25 | Feb 19 | Feb 12 | Feb 1 | Jan 22 | Jan 8 | Dec 29 |
| 20°F | Feb 17 | Jan 31 | Jan 22 | Jan 11 | Jan 5 | Dec 31 | Dec 23 | Dec 16 | Dec 7 |
| 16°F | Jan 24 | Jan 8 | Jan 2 | Dec 31 | Dec 26 | Dec 22 | Dec 17 | Dec 12 | Dec 8 |
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 11 | Oct 2 | Oct 22 |
| Freeze (32°F) | Oct 2 | Oct 24 | Nov 13 |
| Hard (28°F) | Oct 24 | Nov 13 | Dec 13 |
| Severe (24°F) | Nov 9 | Dec 9 | Jan 16 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 11 | Sep 19 | Sep 24 | Sep 29 | Oct 2 | Oct 6 | Oct 11 | Oct 16 | Oct 22 |
| 32°F | Oct 2 | Oct 10 | Oct 16 | Oct 20 | Oct 24 | Oct 27 | Oct 31 | Nov 5 | Nov 13 |
| 28°F | Oct 24 | Oct 30 | Nov 4 | Nov 9 | Nov 13 | Nov 20 | Nov 28 | Dec 3 | Dec 13 |
| 24°F | Nov 9 | Nov 18 | Nov 29 | Dec 4 | Dec 9 | Dec 18 | Dec 24 | Jan 1 | Jan 16 |
| 20°F | Nov 29 | Dec 5 | Dec 10 | Dec 16 | Dec 22 | Dec 28 | Jan 1 | Jan 13 | Feb 1 |
| 16°F | Dec 6 | Dec 9 | Dec 13 | Dec 20 | Dec 23 | Dec 28 | Dec 31 | Jan 4 | Jan 19 |
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: Oakridge Fish Hatchery, Or, about 15.4 miles away@if(!empty($station['elevation_ft'])), at 1,275 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 Westfir, OR?
On average, the last spring frost (32°F) around Westfir, OR 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 Westfir, OR 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 183 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 97434 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026