Last spring frost
Apr 13
Frost Dates for Alsea, OR
First fall frost
Nov 3
Growing season
202 days
Hardiness zone
8b
In an average year around Alsea, OR, the last spring frost (32°F) is about Apr 13 and the first fall frost is about Nov 3, giving roughly a 202-day growing season. To be safe most years, wait until Mar 17 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 28 | May 7 | Apr 23 |
| Freeze (32°F) | May 3 | Apr 13 | Mar 17 |
| Hard (28°F) | Mar 31 | Feb 28 | Jan 5 |
| Severe (24°F) | Feb 27 | Jan 12 | Dec 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 28 | May 19 | May 14 | May 10 | May 7 | May 4 | May 1 | Apr 28 | Apr 23 |
| 32°F | May 3 | Apr 29 | Apr 23 | Apr 18 | Apr 13 | Apr 8 | Apr 3 | Mar 29 | Mar 17 |
| 28°F | Mar 31 | Mar 23 | Mar 15 | Mar 6 | Feb 28 | Feb 21 | Feb 14 | Jan 31 | Jan 5 |
| 24°F | Feb 27 | Feb 18 | Feb 4 | Jan 24 | Jan 12 | Jan 3 | Dec 24 | Dec 14 | Dec 4 |
| 20°F | Feb 19 | Feb 1 | Jan 13 | Jan 3 | Dec 30 | Dec 24 | Dec 18 | Dec 13 | 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 22 | Oct 11 | Nov 3 |
| Freeze (32°F) | Oct 9 | Nov 3 | Dec 3 |
| Hard (28°F) | Oct 31 | Nov 28 | Jan 4 |
| Severe (24°F) | Nov 15 | Dec 18 | Feb 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 22 | Sep 29 | Oct 2 | Oct 6 | Oct 11 | Oct 15 | Oct 21 | Oct 27 | Nov 3 |
| 32°F | Oct 9 | Oct 17 | Oct 24 | Oct 30 | Nov 3 | Nov 8 | Nov 13 | Nov 21 | Dec 3 |
| 28°F | Oct 31 | Nov 9 | Nov 14 | Nov 20 | Nov 28 | Dec 2 | Dec 9 | Dec 19 | Jan 4 |
| 24°F | Nov 15 | Nov 28 | Dec 5 | Dec 10 | Dec 18 | Dec 27 | Jan 3 | Jan 18 | Feb 10 |
| 20°F | Dec 3 | Dec 9 | Dec 13 | Dec 19 | Dec 25 | Dec 31 | Jan 5 | Jan 21 | Feb 17 |
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: Alsea Fh (Fall Creek), Or, about 7.7 miles away@if(!empty($station['elevation_ft'])), at 230 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 Alsea, OR?
On average, the last spring frost (32°F) around Alsea, OR is about Apr 13. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 17.
When is the first frost in the fall?
The first fall frost around Alsea, OR typically arrives about Nov 3. 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 13 on average, or Mar 17 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 202 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 97324 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026