Last spring frost
Apr 14
Frost Dates for The Dalles, OR
First fall frost
Oct 23
Growing season
191 days
Hardiness zone
7b
In an average year around The Dalles, OR, the last spring frost (32°F) is about Apr 14 and the first fall frost is about Oct 23, giving roughly a 191-day growing season. To be safe most years, wait until Mar 27 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 14 | Apr 30 | Apr 18 |
| Freeze (32°F) | May 1 | Apr 14 | Mar 27 |
| Hard (28°F) | Apr 9 | Mar 20 | Feb 28 |
| Severe (24°F) | Mar 15 | Feb 27 | Jan 31 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 14 | May 8 | May 5 | May 2 | Apr 30 | Apr 28 | Apr 25 | Apr 22 | Apr 18 |
| 32°F | May 1 | Apr 26 | Apr 21 | Apr 18 | Apr 14 | Apr 9 | Apr 6 | Apr 1 | Mar 27 |
| 28°F | Apr 9 | Apr 2 | Mar 29 | Mar 25 | Mar 20 | Mar 15 | Mar 11 | Mar 7 | Feb 28 |
| 24°F | Mar 15 | Mar 10 | Mar 5 | Mar 2 | Feb 27 | Feb 23 | Feb 18 | Feb 12 | Jan 31 |
| 20°F | Mar 4 | Feb 27 | Feb 22 | Feb 16 | Feb 9 | Feb 1 | Jan 19 | Jan 8 | Dec 30 |
| 16°F | Feb 26 | Feb 17 | Feb 8 | Jan 31 | Jan 20 | Jan 10 | Jan 2 | Dec 25 | Dec 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%) |
|---|---|---|---|
| Light (36°F) | Sep 25 | Oct 8 | Oct 26 |
| Freeze (32°F) | Oct 5 | Oct 23 | Nov 9 |
| Hard (28°F) | Oct 19 | Nov 5 | Nov 26 |
| Severe (24°F) | Oct 30 | Nov 22 | Dec 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 25 | Oct 1 | Oct 3 | Oct 5 | Oct 8 | Oct 12 | Oct 16 | Oct 20 | Oct 26 |
| 32°F | Oct 5 | Oct 11 | Oct 16 | Oct 19 | Oct 23 | Oct 27 | Oct 30 | Nov 3 | Nov 9 |
| 28°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 9 | Nov 13 | Nov 19 | Nov 26 |
| 24°F | Oct 30 | Nov 5 | Nov 11 | Nov 16 | Nov 22 | Nov 26 | Dec 1 | Dec 9 | Dec 21 |
| 20°F | Nov 8 | Nov 17 | Nov 24 | Dec 1 | Dec 7 | Dec 15 | Dec 23 | Jan 1 | Jan 13 |
| 16°F | Nov 14 | Nov 28 | Dec 6 | Dec 12 | Dec 20 | Dec 27 | Jan 1 | Jan 12 | Jan 31 |
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: The Dalles, Or, about 4.5 miles away@if(!empty($station['elevation_ft'])), at 150 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 The Dalles, OR?
On average, the last spring frost (32°F) around The Dalles, OR is about Apr 14. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 27.
When is the first frost in the fall?
The first fall frost around The Dalles, OR typically arrives about Oct 23. 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 14 on average, or Mar 27 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 191 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 97058 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026