Last spring frost
Jun 11
Frost Dates for Hines, OR
First fall frost
Sep 28
Growing season
107 days
Hardiness zone
6a
In an average year around Hines, OR, the last spring frost (32°F) is about Jun 11 and the first fall frost is about Sep 28, giving roughly a 107-day growing season. To be safe most years, wait until May 18 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%) |
|---|---|---|---|
| Freeze (32°F) | Jun 28 | Jun 11 | May 18 |
| Hard (28°F) | Jun 18 | May 24 | Apr 27 |
| Severe (24°F) | May 29 | Apr 28 | Apr 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 28 | Jun 21 | Jun 17 | Jun 14 | Jun 11 | Jun 7 | Jun 3 | May 29 | May 18 |
| 28°F | Jun 18 | Jun 10 | Jun 4 | May 31 | May 24 | May 17 | May 9 | May 2 | Apr 27 |
| 24°F | May 29 | May 14 | May 5 | May 1 | Apr 28 | Apr 24 | Apr 19 | Apr 13 | Apr 4 |
| 20°F | May 1 | Apr 26 | Apr 17 | Apr 12 | Apr 7 | Apr 1 | Mar 26 | Mar 18 | Mar 8 |
| 16°F | Apr 13 | Apr 4 | Mar 27 | Mar 17 | Mar 10 | Mar 6 | Mar 2 | Feb 24 | Feb 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%) |
|---|---|---|---|
| Freeze (32°F) | Sep 3 | Sep 28 | Oct 13 |
| Hard (28°F) | Sep 22 | Oct 13 | Oct 28 |
| Severe (24°F) | Oct 10 | Oct 27 | Nov 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Sep 3 | Sep 12 | Sep 20 | Sep 25 | Sep 28 | Oct 1 | Oct 4 | Oct 7 | Oct 13 |
| 28°F | Sep 22 | Oct 1 | Oct 5 | Oct 9 | Oct 13 | Oct 16 | Oct 19 | Oct 23 | Oct 28 |
| 24°F | Oct 10 | Oct 17 | Oct 20 | Oct 24 | Oct 27 | Oct 29 | Nov 1 | Nov 5 | Nov 10 |
| 20°F | Oct 21 | Oct 27 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 22 |
| 16°F | Oct 29 | Nov 4 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 23 | Nov 28 | Dec 4 |
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: Squaw Butte-Northern Great Bas, Or, about 3.5 miles away@if(!empty($station['elevation_ft'])), at 4,660 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 Hines, OR?
On average, the last spring frost (32°F) around Hines, OR is about Jun 11. In cooler years it can run later, so for a safer bet many gardeners wait until May 18.
When is the first frost in the fall?
The first fall frost around Hines, OR typically arrives about Sep 28. 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 Jun 11 on average, or May 18 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 107 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 97758 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026