Last spring frost
May 12
Frost Dates for Dufur, OR
First fall frost
Oct 7
Growing season
148 days
Hardiness zone
7b
In an average year around Dufur, OR, the last spring frost (32°F) is about May 12 and the first fall frost is about Oct 7, giving roughly a 148-day growing season. To be safe most years, wait until Apr 25 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 23 | Jun 5 | May 14 |
| Freeze (32°F) | May 31 | May 12 | Apr 25 |
| Hard (28°F) | May 10 | Apr 24 | Mar 30 |
| Severe (24°F) | Apr 18 | Mar 26 | Feb 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 23 | Jun 17 | Jun 13 | Jun 8 | Jun 5 | Jun 1 | May 29 | May 22 | May 14 |
| 32°F | May 31 | May 26 | May 20 | May 16 | May 12 | May 8 | May 4 | Apr 30 | Apr 25 |
| 28°F | May 10 | May 5 | May 1 | Apr 28 | Apr 24 | Apr 18 | Apr 13 | Apr 7 | Mar 30 |
| 24°F | Apr 18 | Apr 8 | Apr 2 | Mar 30 | Mar 26 | Mar 20 | Mar 14 | Mar 7 | Feb 28 |
| 20°F | Mar 22 | Mar 9 | Mar 1 | Feb 26 | Feb 20 | Feb 14 | Feb 7 | Jan 27 | Jan 12 |
| 16°F | Mar 1 | Feb 21 | Feb 13 | Feb 4 | Jan 30 | Jan 18 | Jan 11 | Jan 3 | Dec 22 |
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 4 | Sep 22 | Oct 6 |
| Freeze (32°F) | Sep 22 | Oct 7 | Oct 23 |
| Hard (28°F) | Oct 5 | Oct 24 | Nov 8 |
| Severe (24°F) | Oct 23 | Nov 5 | Nov 30 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 4 | Sep 10 | Sep 14 | Sep 19 | Sep 22 | Sep 25 | Sep 29 | Oct 1 | Oct 6 |
| 32°F | Sep 22 | Sep 28 | Oct 1 | Oct 4 | Oct 7 | Oct 10 | Oct 14 | Oct 18 | Oct 23 |
| 28°F | Oct 5 | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 3 | Nov 8 |
| 24°F | Oct 23 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 9 | Nov 14 | Nov 20 | Nov 30 |
| 20°F | Oct 30 | Nov 4 | Nov 9 | Nov 14 | Nov 19 | Nov 24 | Nov 30 | Dec 7 | Dec 19 |
| 16°F | Nov 5 | Nov 13 | Nov 22 | Nov 28 | Dec 5 | Dec 11 | Dec 19 | Dec 26 | Jan 8 |
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: Dufur, Or, about 4.8 miles away@if(!empty($station['elevation_ft'])), at 1,330 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 Dufur, OR?
On average, the last spring frost (32°F) around Dufur, OR is about May 12. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 25.
When is the first frost in the fall?
The first fall frost around Dufur, OR typically arrives about Oct 7. 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 May 12 on average, or Apr 25 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 148 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 97021 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026