Last spring frost
Mar 31
Frost Dates for Roseburg North, OR
First fall frost
Nov 5
Growing season
215 days
Hardiness zone
8b
In an average year around Roseburg North, OR, the last spring frost (32°F) is about Mar 31 and the first fall frost is about Nov 5, giving roughly a 215-day growing season. To be safe most years, wait until Mar 5 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 15 | Apr 28 | Apr 6 |
| Freeze (32°F) | Apr 26 | Mar 31 | Mar 5 |
| Hard (28°F) | Mar 31 | Feb 26 | Jan 11 |
| Severe (24°F) | Feb 24 | Jan 20 | Nov 30 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 15 | May 9 | May 4 | May 1 | Apr 28 | Apr 24 | Apr 20 | Apr 14 | Apr 6 |
| 32°F | Apr 26 | Apr 18 | Apr 10 | Apr 4 | Mar 31 | Mar 27 | Mar 22 | Mar 14 | Mar 5 |
| 28°F | Mar 31 | Mar 19 | Mar 9 | Mar 3 | Feb 26 | Feb 20 | Feb 13 | Feb 1 | Jan 11 |
| 24°F | Feb 24 | Feb 17 | Feb 5 | Jan 29 | Jan 20 | Jan 6 | Dec 30 | Dec 18 | Nov 30 |
| 20°F | Feb 15 | Jan 25 | Jan 13 | Jan 1 | Dec 30 | Dec 25 | Dec 20 | Dec 13 | Dec 5 |
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 2 | Oct 20 | Nov 6 |
| Freeze (32°F) | Oct 16 | Nov 5 | Dec 3 |
| Hard (28°F) | Oct 29 | Dec 1 | Jan 10 |
| Severe (24°F) | Nov 12 | Dec 21 | Feb 8 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 2 | Oct 8 | Oct 13 | Oct 17 | Oct 20 | Oct 23 | Oct 27 | Oct 31 | Nov 6 |
| 32°F | Oct 16 | Oct 23 | Oct 28 | Nov 1 | Nov 5 | Nov 9 | Nov 15 | Nov 24 | Dec 3 |
| 28°F | Oct 29 | Nov 7 | Nov 14 | Nov 24 | Dec 1 | Dec 6 | Dec 16 | Dec 25 | Jan 10 |
| 24°F | Nov 12 | Nov 30 | Dec 5 | Dec 14 | Dec 21 | Dec 30 | Jan 6 | Jan 23 | Feb 8 |
| 20°F | Dec 1 | Dec 8 | Dec 16 | Dec 21 | Dec 25 | Dec 30 | Jan 4 | Jan 19 | Feb 11 |
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: Winchester, Or, about 2 miles away@if(!empty($station['elevation_ft'])), at 460 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 Roseburg North, OR?
On average, the last spring frost (32°F) around Roseburg North, OR is about Mar 31. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 5.
When is the first frost in the fall?
The first fall frost around Roseburg North, OR typically arrives about Nov 5. 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 31 on average, or Mar 5 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 215 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 97495 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026