Last spring frost
Apr 22
Frost Dates for Pendleton, OR
First fall frost
Oct 9
Growing season
170 days
Hardiness zone
7a
In an average year around Pendleton, OR, the last spring frost (32°F) is about Apr 22 and the first fall frost is about Oct 9, giving roughly a 170-day growing season. To be safe most years, wait until Apr 3 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 20 | May 7 | Apr 24 |
| Freeze (32°F) | May 8 | Apr 22 | Apr 3 |
| Hard (28°F) | Apr 21 | Mar 31 | Mar 10 |
| Severe (24°F) | Mar 31 | Mar 9 | Feb 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 20 | May 16 | May 13 | May 10 | May 7 | May 4 | May 1 | Apr 29 | Apr 24 |
| 32°F | May 8 | May 2 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 14 | Apr 10 | Apr 3 |
| 28°F | Apr 21 | Apr 14 | Apr 8 | Apr 3 | Mar 31 | Mar 28 | Mar 23 | Mar 17 | Mar 10 |
| 24°F | Mar 31 | Mar 23 | Mar 17 | Mar 13 | Mar 9 | Mar 6 | Mar 1 | Feb 26 | Feb 19 |
| 20°F | Mar 11 | Mar 5 | Mar 1 | Feb 27 | Feb 23 | Feb 18 | Feb 13 | Feb 4 | Jan 23 |
| 16°F | Mar 2 | Feb 26 | Feb 20 | Feb 15 | Feb 8 | Feb 1 | Jan 22 | Jan 10 | Dec 28 |
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 15 | Sep 29 | Oct 12 |
| Freeze (32°F) | Sep 27 | Oct 9 | Oct 26 |
| Hard (28°F) | Oct 7 | Oct 24 | Nov 11 |
| Severe (24°F) | Oct 19 | Nov 5 | Nov 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 15 | Sep 20 | Sep 23 | Sep 26 | Sep 29 | Oct 1 | Oct 3 | Oct 6 | Oct 12 |
| 32°F | Sep 27 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 13 | Oct 16 | Oct 20 | Oct 26 |
| 28°F | Oct 7 | Oct 12 | Oct 17 | Oct 20 | Oct 24 | Oct 27 | Oct 31 | Nov 4 | Nov 11 |
| 24°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 11 | Nov 15 | Nov 21 | Nov 27 |
| 20°F | Oct 29 | Nov 4 | Nov 11 | Nov 17 | Nov 21 | Nov 26 | Dec 1 | Dec 7 | Dec 21 |
| 16°F | Nov 6 | Nov 15 | Nov 25 | Dec 1 | Dec 5 | Dec 12 | Dec 20 | Dec 30 | Jan 12 |
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: Pendleton Dwtn, Or, about 1.3 miles away@if(!empty($station['elevation_ft'])), at 1,040 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 Pendleton, OR?
On average, the last spring frost (32°F) around Pendleton, OR is about Apr 22. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 3.
When is the first frost in the fall?
The first fall frost around Pendleton, OR typically arrives about Oct 9. 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 22 on average, or Apr 3 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 170 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 97801 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026