Growing season
70 days
Frost Dates for Plush, OR
Hardiness zone
6b
Frost normals for this location are limited (the nearest long-term weather station may not report all thresholds). The available data is shown below.
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%) |
|---|---|---|---|
| Hard (28°F) | Jun 27 | Jun 6 | May 13 |
| Severe (24°F) | Jun 13 | May 13 | Apr 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 28°F | Jun 27 | Jun 20 | Jun 16 | Jun 11 | Jun 6 | Jun 1 | May 27 | May 21 | May 13 |
| 24°F | Jun 13 | Jun 2 | May 25 | May 18 | May 13 | May 9 | May 5 | May 1 | Apr 27 |
| 20°F | May 19 | May 9 | May 4 | Apr 30 | Apr 27 | Apr 24 | Apr 21 | Apr 15 | Apr 7 |
| 16°F | Apr 28 | Apr 22 | Apr 17 | Apr 12 | Apr 6 | Apr 2 | Mar 28 | Mar 20 | Mar 10 |
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%) |
|---|---|---|---|
| Hard (28°F) | Aug 28 | Sep 17 | Oct 6 |
| Severe (24°F) | Sep 8 | Oct 4 | Oct 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 28°F | Aug 28 | Sep 4 | Sep 9 | Sep 13 | Sep 17 | Sep 22 | Sep 26 | Oct 1 | Oct 6 |
| 24°F | Sep 8 | Sep 16 | Sep 25 | Oct 1 | Oct 4 | Oct 8 | Oct 12 | Oct 16 | Oct 23 |
| 20°F | Oct 1 | Oct 7 | Oct 13 | Oct 16 | Oct 20 | Oct 24 | Oct 28 | Nov 1 | Nov 8 |
| 16°F | Oct 12 | Oct 17 | Oct 22 | Oct 27 | Oct 31 | Nov 3 | Nov 8 | Nov 14 | Nov 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: Hart Mtn Refuge, Or, about 22.7 miles away@if(!empty($station['elevation_ft'])), at 5,618 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
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 70 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 97620 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026