Last spring frost
Feb 20
Frost Dates for Rosedale, CA
First fall frost
Nov 23
Growing season
276 days
Hardiness zone
9b
In an average year around Rosedale, CA, the last spring frost (32°F) is about Feb 20 and the first fall frost is about Nov 23, giving roughly a 276-day growing season. To be safe most years, wait until Jan 17 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) | Apr 12 | Mar 20 | Feb 22 |
| Freeze (32°F) | Mar 9 | Feb 20 | Jan 17 |
| Hard (28°F) | Feb 22 | Jan 22 | Dec 22 |
| Severe (24°F) | Jan 31 | Dec 31 | Dec 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 12 | Apr 7 | Apr 1 | Mar 27 | Mar 20 | Mar 13 | Mar 7 | Mar 1 | Feb 22 |
| 32°F | Mar 9 | Mar 2 | Feb 27 | Feb 24 | Feb 20 | Feb 14 | Feb 8 | Jan 30 | Jan 17 |
| 28°F | Feb 22 | Feb 12 | Feb 6 | Jan 31 | Jan 22 | Jan 14 | Jan 5 | Dec 31 | Dec 22 |
| 24°F | Jan 31 | Jan 17 | Jan 8 | Jan 3 | Dec 31 | Dec 27 | Dec 23 | Dec 19 | Dec 13 |
| 20°F | Jan 12 | Jan 5 | Jan 1 | Dec 31 | Dec 28 | Dec 24 | Dec 20 | Dec 16 | 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 20 | Nov 7 | Nov 22 |
| Freeze (32°F) | Nov 5 | Nov 23 | Dec 9 |
| Hard (28°F) | Nov 21 | Dec 6 | Jan 5 |
| Severe (24°F) | Dec 1 | Dec 17 | Jan 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 20 | Oct 28 | Nov 1 | Nov 5 | Nov 7 | Nov 10 | Nov 13 | Nov 18 | Nov 22 |
| 32°F | Nov 5 | Nov 12 | Nov 16 | Nov 19 | Nov 23 | Nov 26 | Nov 29 | Dec 3 | Dec 9 |
| 28°F | Nov 21 | Nov 26 | Nov 30 | Dec 2 | Dec 6 | Dec 9 | Dec 13 | Dec 20 | Jan 5 |
| 24°F | Dec 1 | Dec 6 | Dec 10 | Dec 13 | Dec 17 | Dec 21 | Dec 26 | Jan 1 | Jan 13 |
| 20°F | Dec 5 | Dec 11 | Dec 16 | Dec 20 | Dec 24 | Dec 29 | Dec 31 | Jan 3 | Jan 7 |
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: Shafter 6E, Ca, about 8.5 miles away@if(!empty($station['elevation_ft'])), at 404 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 Rosedale, CA?
On average, the last spring frost (32°F) around Rosedale, CA is about Feb 20. In cooler years it can run later, so for a safer bet many gardeners wait until Jan 17.
When is the first frost in the fall?
The first fall frost around Rosedale, CA typically arrives about Nov 23. 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 Feb 20 on average, or Jan 17 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 276 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 93314 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026