Last spring frost
Apr 18
Frost Dates for Falls City, OR
First fall frost
Nov 7
Growing season
202 days
Hardiness zone
8b
In an average year around Falls City, OR, the last spring frost (32°F) is about Apr 18 and the first fall frost is about Nov 7, giving roughly a 202-day growing season. To be safe most years, wait until Mar 27 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 29 | May 9 | Apr 26 |
| Freeze (32°F) | May 6 | Apr 18 | Mar 27 |
| Hard (28°F) | Apr 5 | Mar 13 | Feb 15 |
| Severe (24°F) | Mar 10 | Feb 13 | Dec 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 29 | May 21 | May 17 | May 13 | May 9 | May 6 | May 3 | Apr 30 | Apr 26 |
| 32°F | May 6 | May 1 | Apr 27 | Apr 23 | Apr 18 | Apr 13 | Apr 7 | Apr 2 | Mar 27 |
| 28°F | Apr 5 | Mar 29 | Mar 24 | Mar 19 | Mar 13 | Mar 8 | Mar 1 | Feb 25 | Feb 15 |
| 24°F | Mar 10 | Mar 2 | Feb 25 | Feb 20 | Feb 13 | Feb 2 | Jan 24 | Jan 10 | Dec 29 |
| 20°F | Feb 23 | Feb 13 | Feb 2 | Jan 25 | Jan 15 | Jan 7 | Dec 31 | Dec 21 | Dec 8 |
| 16°F | Feb 15 | Feb 3 | Jan 25 | Jan 13 | Jan 3 | Dec 31 | Dec 24 | Dec 18 | 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 2 | Oct 21 | Nov 5 |
| Freeze (32°F) | Oct 21 | Nov 7 | Nov 24 |
| Hard (28°F) | Nov 3 | Nov 23 | Dec 20 |
| Severe (24°F) | Nov 13 | Dec 14 | Jan 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 2 | Oct 8 | Oct 13 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Nov 1 | Nov 5 |
| 32°F | Oct 21 | Oct 27 | Oct 31 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 18 | Nov 24 |
| 28°F | Nov 3 | Nov 9 | Nov 13 | Nov 18 | Nov 23 | Nov 28 | Dec 4 | Dec 10 | Dec 20 |
| 24°F | Nov 13 | Nov 23 | Dec 1 | Dec 7 | Dec 14 | Dec 20 | Dec 29 | Jan 6 | Jan 21 |
| 20°F | Nov 26 | Dec 8 | Dec 15 | Dec 23 | Dec 29 | Jan 3 | Jan 10 | Jan 21 | Feb 9 |
| 16°F | Dec 7 | Dec 14 | Dec 23 | Dec 27 | Jan 1 | Jan 6 | Jan 16 | Jan 31 | 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: Falls City 2 Ssw, Or, about 2.4 miles away@if(!empty($station['elevation_ft'])), at 690 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 Falls City, OR?
On average, the last spring frost (32°F) around Falls City, OR is about Apr 18. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 27.
When is the first frost in the fall?
The first fall frost around Falls City, OR typically arrives about Nov 7. 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 18 on average, or Mar 27 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 202 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 97344 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026