Last spring frost
Apr 16
Frost Dates for Yoncalla, OR
First fall frost
Oct 25
Growing season
193 days
Hardiness zone
8b
In an average year around Yoncalla, OR, the last spring frost (32°F) is about Apr 16 and the first fall frost is about Oct 25, giving roughly a 193-day growing season. To be safe most years, wait until Mar 23 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 26 | May 8 | Apr 23 |
| Freeze (32°F) | May 8 | Apr 16 | Mar 23 |
| Hard (28°F) | Apr 4 | Mar 10 | Feb 1 |
| Severe (24°F) | Mar 8 | Feb 4 | Dec 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 19 | May 15 | May 12 | May 8 | May 4 | May 1 | Apr 28 | Apr 23 |
| 32°F | May 8 | May 2 | Apr 28 | Apr 22 | Apr 16 | Apr 11 | Apr 5 | Mar 31 | Mar 23 |
| 28°F | Apr 4 | Mar 28 | Mar 22 | Mar 16 | Mar 10 | Mar 2 | Feb 25 | Feb 16 | Feb 1 |
| 24°F | Mar 8 | Feb 27 | Feb 20 | Feb 14 | Feb 4 | Jan 25 | Jan 10 | Dec 30 | Dec 10 |
| 20°F | Feb 21 | Feb 13 | Feb 1 | Jan 14 | Jan 2 | Dec 28 | Dec 20 | Dec 10 | Dec 1 |
| 16°F | Feb 11 | Jan 7 | Dec 30 | Dec 23 | Dec 20 | Dec 16 | Dec 12 | Dec 7 | Nov 30 |
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 12 | Oct 3 | Oct 26 |
| Freeze (32°F) | Oct 2 | Oct 25 | Nov 25 |
| Hard (28°F) | Oct 21 | Nov 21 | Dec 29 |
| Severe (24°F) | Nov 2 | Dec 14 | Feb 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 12 | Sep 21 | Sep 26 | Sep 30 | Oct 3 | Oct 7 | Oct 13 | Oct 18 | Oct 26 |
| 32°F | Oct 2 | Oct 9 | Oct 16 | Oct 20 | Oct 25 | Oct 30 | Nov 4 | Nov 14 | Nov 25 |
| 28°F | Oct 21 | Oct 29 | Nov 4 | Nov 12 | Nov 21 | Nov 29 | Dec 6 | Dec 16 | Dec 29 |
| 24°F | Nov 2 | Nov 14 | Nov 27 | Dec 4 | Dec 14 | Dec 22 | Jan 1 | Jan 15 | Feb 3 |
| 20°F | Nov 13 | Nov 30 | Dec 7 | Dec 14 | Dec 21 | Dec 28 | Jan 3 | Jan 20 | Feb 13 |
| 16°F | Nov 30 | Dec 5 | Dec 9 | Dec 12 | Dec 17 | Dec 21 | Dec 25 | Dec 31 | Feb 1 |
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: Drain, Or, about 6.4 miles away@if(!empty($station['elevation_ft'])), at 292 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 Yoncalla, OR?
On average, the last spring frost (32°F) around Yoncalla, OR is about Apr 16. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 23.
When is the first frost in the fall?
The first fall frost around Yoncalla, OR typically arrives about Oct 25. 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 16 on average, or Mar 23 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 193 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 97499 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026