Last spring frost
Apr 30
Frost Dates for Spray, OR
First fall frost
Oct 14
Growing season
167 days
Hardiness zone
7a
In an average year around Spray, OR, the last spring frost (32°F) is about Apr 30 and the first fall frost is about Oct 14, giving roughly a 167-day growing season. To be safe most years, wait until Apr 14 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 30 | May 13 | May 1 |
| Freeze (32°F) | May 14 | Apr 30 | Apr 14 |
| Hard (28°F) | Apr 29 | Apr 9 | Mar 13 |
| Severe (24°F) | Apr 11 | Mar 12 | Feb 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 30 | May 23 | May 19 | May 16 | May 13 | May 11 | May 8 | May 5 | May 1 |
| 32°F | May 14 | May 9 | May 5 | May 2 | Apr 30 | Apr 27 | Apr 25 | Apr 21 | Apr 14 |
| 28°F | Apr 29 | Apr 24 | Apr 19 | Apr 15 | Apr 9 | Apr 4 | Mar 31 | Mar 26 | Mar 13 |
| 24°F | Apr 11 | Apr 1 | Mar 26 | Mar 19 | Mar 12 | Mar 7 | Mar 3 | Feb 27 | Feb 19 |
| 20°F | Mar 16 | Mar 7 | Mar 2 | Feb 28 | Feb 24 | Feb 19 | Feb 14 | Feb 7 | Jan 31 |
| 16°F | Mar 2 | Feb 24 | Feb 19 | Feb 14 | Feb 8 | Feb 1 | Jan 23 | Jan 8 | Dec 26 |
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 14 | Oct 1 | Oct 15 |
| Freeze (32°F) | Oct 1 | Oct 14 | Oct 31 |
| Hard (28°F) | Oct 8 | Oct 28 | Nov 15 |
| Severe (24°F) | Oct 19 | Nov 9 | Nov 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 14 | Sep 21 | Sep 25 | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 10 | Oct 15 |
| 32°F | Oct 1 | Oct 4 | Oct 7 | Oct 11 | Oct 14 | Oct 17 | Oct 21 | Oct 24 | Oct 31 |
| 28°F | Oct 8 | Oct 16 | Oct 19 | Oct 24 | Oct 28 | Oct 31 | Nov 3 | Nov 7 | Nov 15 |
| 24°F | Oct 19 | Oct 27 | Nov 1 | Nov 5 | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 28 |
| 20°F | Oct 29 | Nov 6 | Nov 12 | Nov 16 | Nov 21 | Nov 25 | Nov 29 | Dec 4 | Dec 15 |
| 16°F | Nov 7 | Nov 14 | Nov 22 | Nov 27 | Dec 1 | Dec 6 | Dec 15 | Dec 24 | Jan 6 |
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: John Day 35 Wnw, Or, about 17.1 miles away@if(!empty($station['elevation_ft'])), at 2,245 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 Spray, OR?
On average, the last spring frost (32°F) around Spray, OR is about Apr 30. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 14.
When is the first frost in the fall?
The first fall frost around Spray, OR typically arrives about Oct 14. 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 30 on average, or Apr 14 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 167 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 97874 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026