Last spring frost
Mar 7
Frost Dates for Jasper, OR
First fall frost
Nov 27
Growing season
263 days
Hardiness zone
8b
In an average year around Jasper, OR, the last spring frost (32°F) is about Mar 7 and the first fall frost is about Nov 27, giving roughly a 263-day growing season. To be safe most years, wait until Feb 4 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 9 | Apr 16 | Mar 20 |
| Freeze (32°F) | Apr 2 | Mar 7 | Feb 4 |
| Hard (28°F) | Mar 5 | Feb 2 | Dec 21 |
| Severe (24°F) | Feb 19 | Jan 7 | Dec 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 9 | May 2 | Apr 28 | Apr 22 | Apr 16 | Apr 10 | Apr 3 | Mar 29 | Mar 20 |
| 32°F | Apr 2 | Mar 25 | Mar 18 | Mar 11 | Mar 7 | Feb 28 | Feb 23 | Feb 16 | Feb 4 |
| 28°F | Mar 5 | Feb 25 | Feb 17 | Feb 9 | Feb 2 | Jan 25 | Jan 12 | Jan 2 | Dec 21 |
| 24°F | Feb 19 | Feb 12 | Jan 31 | Jan 20 | Jan 7 | Jan 1 | Dec 27 | Dec 18 | Dec 10 |
| 20°F | Feb 8 | Jan 24 | Jan 8 | Dec 31 | Dec 28 | Dec 24 | Dec 19 | Dec 15 | 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) | Oct 19 | Nov 9 | Nov 29 |
| Freeze (32°F) | Nov 1 | Nov 27 | Dec 21 |
| Hard (28°F) | Nov 18 | Dec 16 | Feb 1 |
| Severe (24°F) | Dec 3 | Dec 30 | Feb 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 19 | Oct 26 | Oct 31 | Nov 5 | Nov 9 | Nov 13 | Nov 18 | Nov 24 | Nov 29 |
| 32°F | Nov 1 | Nov 9 | Nov 16 | Nov 22 | Nov 27 | Dec 1 | Dec 6 | Dec 12 | Dec 21 |
| 28°F | Nov 18 | Dec 1 | Dec 6 | Dec 12 | Dec 16 | Dec 24 | Jan 1 | Jan 11 | Feb 1 |
| 24°F | Dec 3 | Dec 10 | Dec 16 | Dec 24 | Dec 30 | Jan 3 | Jan 14 | Jan 29 | Feb 12 |
| 20°F | Dec 7 | Dec 12 | Dec 16 | Dec 22 | Dec 26 | Dec 30 | Jan 6 | Jan 21 | Feb 1 |
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: Lookout Pt Dam, Or, about 8.8 miles away@if(!empty($station['elevation_ft'])), at 712 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 Jasper, OR?
On average, the last spring frost (32°F) around Jasper, OR is about Mar 7. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 4.
When is the first frost in the fall?
The first fall frost around Jasper, OR typically arrives about Nov 27. 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 Mar 7 on average, or Feb 4 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 263 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 97455 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026