Last spring frost
Apr 27
Frost Dates for Scotts Mills, OR
First fall frost
Nov 4
Growing season
190 days
Hardiness zone
8b
In an average year around Scotts Mills, OR, the last spring frost (32°F) is about Apr 27 and the first fall frost is about Nov 4, giving roughly a 190-day growing season. To be safe most years, wait until Apr 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) | Jun 1 | May 17 | Apr 30 |
| Freeze (32°F) | May 17 | Apr 27 | Apr 4 |
| Hard (28°F) | Apr 25 | Mar 25 | Feb 10 |
| Severe (24°F) | Mar 26 | Feb 10 | Dec 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 1 | May 29 | May 25 | May 21 | May 17 | May 14 | May 9 | May 5 | Apr 30 |
| 32°F | May 17 | May 9 | May 5 | May 1 | Apr 27 | Apr 23 | Apr 17 | Apr 11 | Apr 4 |
| 28°F | Apr 25 | Apr 13 | Apr 4 | Mar 30 | Mar 25 | Mar 16 | Mar 9 | Feb 28 | Feb 10 |
| 24°F | Mar 26 | Mar 10 | Feb 28 | Feb 20 | Feb 10 | Jan 28 | Jan 13 | Jan 2 | Dec 15 |
| 20°F | Mar 1 | Feb 21 | Feb 12 | Feb 1 | Jan 18 | Jan 8 | Dec 31 | Dec 17 | Dec 4 |
| 16°F | Feb 20 | Feb 14 | Feb 8 | Jan 31 | Jan 16 | Jan 2 | Dec 25 | Dec 14 | Dec 7 |
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 18 | Nov 2 |
| Freeze (32°F) | Oct 18 | Nov 4 | Nov 23 |
| Hard (28°F) | Nov 1 | Nov 24 | Dec 23 |
| Severe (24°F) | Nov 17 | Dec 16 | Feb 5 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 2 | Oct 8 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Nov 2 |
| 32°F | Oct 18 | Oct 24 | Oct 27 | Oct 31 | Nov 4 | Nov 8 | Nov 12 | Nov 17 | Nov 23 |
| 28°F | Nov 1 | Nov 9 | Nov 14 | Nov 19 | Nov 24 | Nov 29 | Dec 3 | Dec 9 | Dec 23 |
| 24°F | Nov 17 | Nov 27 | Dec 3 | Dec 8 | Dec 16 | Dec 24 | Jan 1 | Jan 12 | Feb 5 |
| 20°F | Nov 28 | Dec 5 | Dec 12 | Dec 21 | Dec 30 | Jan 7 | Jan 19 | Feb 5 | Feb 19 |
| 16°F | Dec 5 | Dec 12 | Dec 19 | Dec 30 | Jan 6 | Jan 23 | Feb 4 | Feb 11 | Feb 18 |
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: Scotts Mills 9 Se, Or, about 4.5 miles away@if(!empty($station['elevation_ft'])), at 2,315 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 Scotts Mills, OR?
On average, the last spring frost (32°F) around Scotts Mills, OR is about Apr 27. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 4.
When is the first frost in the fall?
The first fall frost around Scotts Mills, OR typically arrives about Nov 4. 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 27 on average, or Apr 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 190 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 97375 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026