Last spring frost
Mar 19
Frost Dates for Roseburg, OR
First fall frost
Nov 20
Growing season
245 days
Hardiness zone
8b
In an average year around Roseburg, OR, the last spring frost (32°F) is about Mar 19 and the first fall frost is about Nov 20, giving roughly a 245-day growing season. To be safe most years, wait until Feb 18 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 5 | Apr 18 | Mar 28 |
| Freeze (32°F) | Apr 13 | Mar 19 | Feb 18 |
| Hard (28°F) | Mar 12 | Feb 13 | Dec 24 |
| Severe (24°F) | Feb 23 | Jan 13 | Dec 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 14 | Apr 9 | Apr 3 | Mar 28 |
| 32°F | Apr 13 | Apr 3 | Mar 30 | Mar 25 | Mar 19 | Mar 11 | Mar 2 | Feb 26 | Feb 18 |
| 28°F | Mar 12 | Feb 28 | Feb 23 | Feb 18 | Feb 13 | Feb 4 | Jan 24 | Jan 10 | Dec 24 |
| 24°F | Feb 23 | Feb 17 | Feb 6 | Jan 26 | Jan 13 | Jan 2 | Dec 26 | Dec 14 | Dec 3 |
| 20°F | Jan 30 | Jan 9 | Dec 31 | Dec 29 | Dec 24 | Dec 21 | Dec 14 | Dec 8 | Dec 2 |
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 12 | Oct 29 | Nov 21 |
| Freeze (32°F) | Oct 27 | Nov 20 | Dec 17 |
| Hard (28°F) | Nov 9 | Dec 11 | Jan 27 |
| Severe (24°F) | Nov 20 | Dec 26 | Feb 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 18 | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 13 | Nov 21 |
| 32°F | Oct 27 | Nov 1 | Nov 8 | Nov 14 | Nov 20 | Nov 25 | Dec 1 | Dec 7 | Dec 17 |
| 28°F | Nov 9 | Nov 19 | Nov 28 | Dec 4 | Dec 11 | Dec 18 | Dec 26 | Jan 5 | Jan 27 |
| 24°F | Nov 20 | Dec 1 | Dec 7 | Dec 17 | Dec 26 | Jan 1 | Jan 12 | Jan 28 | Feb 15 |
| 20°F | Dec 1 | Dec 6 | Dec 12 | Dec 17 | Dec 21 | Dec 26 | Dec 30 | Jan 2 | Jan 27 |
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: Roseburg Rgnl Ap, Or, about 5.7 miles away@if(!empty($station['elevation_ft'])), at 525 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, OR?
On average, the last spring frost (32°F) around Roseburg, OR is about Mar 19. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 18.
When is the first frost in the fall?
The first fall frost around Roseburg, OR typically arrives about Nov 20. 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 19 on average, or Feb 18 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 245 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 97470 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026