Last spring frost
Mar 16
Frost Dates for Langlois, OR
First fall frost
Nov 29
Growing season
258 days
Hardiness zone
9a
In an average year around Langlois, OR, the last spring frost (32°F) is about Mar 16 and the first fall frost is about Nov 29, giving roughly a 258-day growing season. To be safe most years, wait until Feb 6 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 11 | Apr 24 | Mar 29 |
| Freeze (32°F) | Apr 15 | Mar 16 | Feb 6 |
| Hard (28°F) | Mar 6 | Jan 29 | Dec 12 |
| Severe (24°F) | Feb 18 | Dec 30 | Dec 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 11 | May 5 | May 1 | Apr 28 | Apr 24 | Apr 20 | Apr 14 | Apr 8 | Mar 29 |
| 32°F | Apr 15 | Apr 5 | Mar 30 | Mar 24 | Mar 16 | Mar 6 | Feb 28 | Feb 20 | Feb 6 |
| 28°F | Mar 6 | Feb 25 | Feb 17 | Feb 8 | Jan 29 | Jan 16 | Jan 4 | Dec 28 | Dec 12 |
| 24°F | Feb 18 | Jan 26 | Jan 9 | Jan 1 | Dec 30 | Dec 26 | Dec 20 | Dec 15 | Dec 9 |
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 | Nov 1 | Nov 26 |
| Freeze (32°F) | Nov 1 | Nov 29 | Jan 4 |
| Hard (28°F) | Nov 17 | Dec 21 | Feb 15 |
| Severe (24°F) | Dec 6 | Dec 25 | Feb 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 6 | Nov 11 | Nov 18 | Nov 26 |
| 32°F | Nov 1 | Nov 8 | Nov 14 | Nov 21 | Nov 29 | Dec 4 | Dec 11 | Dec 19 | Jan 4 |
| 28°F | Nov 17 | Dec 1 | Dec 7 | Dec 12 | Dec 21 | Dec 29 | Jan 8 | Jan 24 | Feb 15 |
| 24°F | Dec 6 | Dec 10 | Dec 16 | Dec 21 | Dec 25 | Dec 29 | Jan 3 | Jan 16 | Feb 12 |
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: Langlois #2, Or, about 4.1 miles away@if(!empty($station['elevation_ft'])), at 90 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 Langlois, OR?
On average, the last spring frost (32°F) around Langlois, OR is about Mar 16. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 6.
When is the first frost in the fall?
The first fall frost around Langlois, OR typically arrives about Nov 29. 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 6 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 258 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 97450 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026