Last spring frost
May 19
Frost Dates for Crooked River Ranch, OR
First fall frost
Oct 4
Growing season
136 days
Hardiness zone
7a
In an average year around Crooked River Ranch, OR, the last spring frost (32°F) is about May 19 and the first fall frost is about Oct 4, giving roughly a 136-day growing season. To be safe most years, wait until May 2 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 28 | Jun 10 | May 21 |
| Freeze (32°F) | Jun 7 | May 19 | May 2 |
| Hard (28°F) | May 20 | May 2 | Apr 20 |
| Severe (24°F) | May 5 | Apr 18 | Mar 30 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 28 | Jun 22 | Jun 17 | Jun 14 | Jun 10 | Jun 5 | Jun 1 | May 28 | May 21 |
| 32°F | Jun 7 | May 31 | May 28 | May 23 | May 19 | May 14 | May 11 | May 7 | May 2 |
| 28°F | May 20 | May 13 | May 8 | May 6 | May 2 | Apr 30 | Apr 28 | Apr 25 | Apr 20 |
| 24°F | May 5 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 15 | Apr 11 | Apr 6 | Mar 30 |
| 20°F | Apr 18 | Apr 9 | Apr 2 | Mar 29 | Mar 23 | Mar 15 | Mar 9 | Feb 28 | Feb 19 |
| 16°F | Mar 23 | Mar 11 | Mar 2 | Feb 27 | Feb 22 | Feb 16 | Feb 9 | Jan 31 | Jan 15 |
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 2 | Sep 19 | Oct 4 |
| Freeze (32°F) | Sep 20 | Oct 4 | Oct 18 |
| Hard (28°F) | Oct 1 | Oct 17 | Nov 1 |
| Severe (24°F) | Oct 16 | Oct 30 | Nov 20 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 2 | Sep 8 | Sep 12 | Sep 16 | Sep 19 | Sep 22 | Sep 25 | Sep 29 | Oct 4 |
| 32°F | Sep 20 | Sep 24 | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 9 | Oct 13 | Oct 18 |
| 28°F | Oct 1 | Oct 6 | Oct 10 | Oct 14 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Nov 1 |
| 24°F | Oct 16 | Oct 22 | Oct 25 | Oct 28 | Oct 30 | Nov 2 | Nov 7 | Nov 12 | Nov 20 |
| 20°F | Oct 26 | Oct 31 | Nov 5 | Nov 10 | Nov 14 | Nov 19 | Nov 23 | Nov 27 | Dec 3 |
| 16°F | Nov 1 | Nov 11 | Nov 16 | Nov 22 | Nov 26 | Dec 1 | Dec 5 | Dec 12 | Dec 22 |
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: Madras 2 N, Or, about 13 miles away@if(!empty($station['elevation_ft'])), at 2,443 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 Crooked River Ranch, OR?
On average, the last spring frost (32°F) around Crooked River Ranch, OR is about May 19. In cooler years it can run later, so for a safer bet many gardeners wait until May 2.
When is the first frost in the fall?
The first fall frost around Crooked River Ranch, OR typically arrives about Oct 4. 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 19 on average, or May 2 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 136 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 97734 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026