Last spring frost
Mar 16
Frost Dates for Mulino, OR
First fall frost
Nov 19
Growing season
247 days
Hardiness zone
8b
In an average year around Mulino, OR, the last spring frost (32°F) is about Mar 16 and the first fall frost is about Nov 19, giving roughly a 247-day growing season. To be safe most years, wait until Feb 24 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 4 | Apr 15 | Mar 26 |
| Freeze (32°F) | Apr 12 | Mar 16 | Feb 24 |
| Hard (28°F) | Mar 10 | Feb 14 | Jan 2 |
| Severe (24°F) | Feb 20 | Jan 10 | Dec 6 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 4 | Apr 30 | Apr 26 | Apr 20 | Apr 15 | Apr 10 | Apr 5 | Apr 1 | Mar 26 |
| 32°F | Apr 12 | Apr 1 | Mar 27 | Mar 21 | Mar 16 | Mar 12 | Mar 7 | Mar 2 | Feb 24 |
| 28°F | Mar 10 | Mar 2 | Feb 26 | Feb 20 | Feb 14 | Feb 6 | Jan 29 | Jan 17 | Jan 2 |
| 24°F | Feb 20 | Feb 9 | Feb 1 | Jan 22 | Jan 10 | Jan 3 | Dec 28 | Dec 17 | Dec 6 |
| 20°F | Feb 15 | Feb 1 | Jan 19 | Jan 6 | Dec 31 | Dec 24 | Dec 17 | Dec 11 | Dec 3 |
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 16 | Nov 1 | Nov 19 |
| Freeze (32°F) | Oct 31 | Nov 19 | Dec 9 |
| Hard (28°F) | Nov 13 | Dec 6 | Jan 12 |
| Severe (24°F) | Nov 23 | Dec 19 | Feb 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 16 | Oct 22 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 19 |
| 32°F | Oct 31 | Nov 7 | Nov 11 | Nov 14 | Nov 19 | Nov 23 | Nov 28 | Dec 2 | Dec 9 |
| 28°F | Nov 13 | Nov 20 | Nov 26 | Dec 1 | Dec 6 | Dec 12 | Dec 19 | Dec 28 | Jan 12 |
| 24°F | Nov 23 | Dec 1 | Dec 7 | Dec 12 | Dec 19 | Dec 28 | Jan 3 | Jan 14 | Feb 2 |
| 20°F | Nov 30 | Dec 7 | Dec 12 | Dec 18 | Dec 25 | Dec 31 | Jan 8 | Jan 26 | 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: Molalla 7Ne, Or, about 2.5 miles away@if(!empty($station['elevation_ft'])), at 647 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 Mulino, OR?
On average, the last spring frost (32°F) around Mulino, OR is about Mar 16. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 24.
When is the first frost in the fall?
The first fall frost around Mulino, OR typically arrives about Nov 19. 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 16 on average, or Feb 24 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 247 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 97042 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026