Last spring frost
Jun 7
Frost Dates for Juntura, OR
First fall frost
Sep 6
Growing season
89 days
Hardiness zone
6b
In an average year around Juntura, OR, the last spring frost (32°F) is about Jun 7 and the first fall frost is about Sep 6, giving roughly a 89-day growing season. To be safe most years, wait until May 21 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 7 | May 21 |
| Hard (28°F) | Jun 10 | May 20 | May 2 |
| Severe (24°F) | May 28 | May 7 | Apr 18 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 28 | Jun 21 | Jun 15 | Jun 11 | Jun 7 | Jun 4 | Jun 1 | May 28 | May 21 |
| 28°F | Jun 10 | Jun 4 | May 30 | May 26 | May 20 | May 16 | May 13 | May 8 | May 2 |
| 24°F | May 28 | May 17 | May 13 | May 10 | May 7 | May 2 | Apr 30 | Apr 25 | Apr 18 |
| 20°F | May 10 | May 5 | Apr 30 | Apr 26 | Apr 21 | Apr 15 | Apr 10 | Apr 3 | Mar 26 |
| 16°F | Apr 25 | Apr 14 | Apr 6 | Apr 1 | Mar 26 | Mar 18 | Mar 10 | Feb 28 | Feb 19 |
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) | Aug 22 | Sep 6 | Sep 22 |
| Hard (28°F) | Sep 2 | Sep 19 | Oct 5 |
| Severe (24°F) | Sep 13 | Oct 1 | Oct 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Aug 22 | Aug 28 | Sep 1 | Sep 4 | Sep 6 | Sep 9 | Sep 12 | Sep 16 | Sep 22 |
| 28°F | Sep 2 | Sep 7 | Sep 12 | Sep 15 | Sep 19 | Sep 23 | Sep 26 | Oct 1 | Oct 5 |
| 24°F | Sep 13 | Sep 20 | Sep 25 | Sep 29 | Oct 1 | Oct 4 | Oct 8 | Oct 13 | Oct 19 |
| 20°F | Sep 26 | Oct 2 | Oct 5 | Oct 10 | Oct 14 | Oct 18 | Oct 22 | Oct 27 | Nov 3 |
| 16°F | Oct 8 | Oct 15 | Oct 20 | Oct 24 | Oct 29 | Nov 1 | Nov 5 | Nov 12 | Nov 21 |
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: Riverside 7 Ssw, Or, about 20.7 miles away@if(!empty($station['elevation_ft'])), at 3,380 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 Juntura, OR?
On average, the last spring frost (32°F) around Juntura, OR is about Jun 7. In cooler years it can run later, so for a safer bet many gardeners wait until May 21.
When is the first frost in the fall?
The first fall frost around Juntura, OR typically arrives about Sep 6. 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 7 on average, or May 21 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 89 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 97906 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026