Last spring frost
Apr 26
Frost Dates for Scio, OR
First fall frost
Oct 24
Growing season
184 days
Hardiness zone
8b
In an average year around Scio, OR, the last spring frost (32°F) is about Apr 26 and the first fall frost is about Oct 24, giving roughly a 184-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 14 | Apr 30 |
| Freeze (32°F) | May 11 | Apr 26 | Apr 4 |
| Hard (28°F) | Apr 19 | Mar 24 | Feb 21 |
| Severe (24°F) | Mar 19 | Feb 16 | Dec 31 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 1 | May 26 | May 21 | May 17 | May 14 | May 11 | May 8 | May 4 | Apr 30 |
| 32°F | May 11 | May 5 | May 1 | Apr 29 | Apr 26 | Apr 22 | Apr 17 | Apr 11 | Apr 4 |
| 28°F | Apr 19 | Apr 7 | Apr 1 | Mar 29 | Mar 24 | Mar 17 | Mar 10 | Feb 28 | Feb 21 |
| 24°F | Mar 19 | Mar 3 | Feb 27 | Feb 21 | Feb 16 | Feb 9 | Jan 31 | Jan 16 | Dec 31 |
| 20°F | Feb 26 | Feb 17 | Feb 4 | Jan 26 | Jan 14 | Jan 5 | Dec 29 | Dec 17 | Dec 5 |
| 16°F | Feb 17 | Feb 1 | Jan 20 | Jan 6 | Dec 31 | Dec 27 | Dec 19 | Dec 11 | Dec 4 |
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 15 | Oct 5 | Oct 27 |
| Freeze (32°F) | Oct 5 | Oct 24 | Nov 14 |
| Hard (28°F) | Oct 22 | Nov 12 | Dec 12 |
| Severe (24°F) | Nov 4 | Dec 5 | Jan 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 15 | Sep 23 | Sep 28 | Oct 1 | Oct 5 | Oct 8 | Oct 13 | Oct 18 | Oct 27 |
| 32°F | Oct 5 | Oct 12 | Oct 17 | Oct 20 | Oct 24 | Oct 28 | Nov 1 | Nov 7 | Nov 14 |
| 28°F | Oct 22 | Oct 29 | Nov 2 | Nov 8 | Nov 12 | Nov 18 | Nov 25 | Dec 3 | Dec 12 |
| 24°F | Nov 4 | Nov 13 | Nov 23 | Nov 30 | Dec 5 | Dec 11 | Dec 21 | Dec 28 | Jan 13 |
| 20°F | Nov 17 | Dec 1 | Dec 7 | Dec 14 | Dec 23 | Dec 29 | Jan 5 | Jan 18 | Feb 10 |
| 16°F | Dec 1 | Dec 8 | Dec 12 | Dec 20 | Dec 26 | Dec 30 | Jan 8 | Jan 23 | Feb 10 |
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: Lacomb 3 Nne, Or, about 5.4 miles away@if(!empty($station['elevation_ft'])), at 520 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 Scio, OR?
On average, the last spring frost (32°F) around Scio, OR is about Apr 26. 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 Scio, OR typically arrives about Oct 24. 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 26 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 184 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 97374 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026