Last spring frost
Mar 6
Frost Dates for Moskowite Corner, CA
First fall frost
Nov 30
Growing season
266 days
Hardiness zone
9b
In an average year around Moskowite Corner, CA, the last spring frost (32°F) is about Mar 6 and the first fall frost is about Nov 30, giving roughly a 266-day growing season. To be safe most years, wait until Jan 31 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 27 | Apr 9 | Mar 15 |
| Freeze (32°F) | Apr 6 | Mar 6 | Jan 31 |
| Hard (28°F) | Feb 26 | Jan 22 | Dec 24 |
| Severe (24°F) | Jan 25 | Dec 31 | Dec 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 27 | Apr 21 | Apr 17 | Apr 13 | Apr 9 | Apr 5 | Apr 1 | Mar 26 | Mar 15 |
| 32°F | Apr 6 | Mar 29 | Mar 21 | Mar 13 | Mar 6 | Feb 28 | Feb 22 | Feb 11 | Jan 31 |
| 28°F | Feb 26 | Feb 13 | Feb 4 | Jan 29 | Jan 22 | Jan 15 | Jan 6 | Dec 31 | Dec 24 |
| 24°F | Jan 25 | Jan 17 | Jan 11 | Jan 5 | Dec 31 | Dec 31 | Dec 27 | Dec 22 | Dec 12 |
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 27 | Nov 12 | Nov 26 |
| Freeze (32°F) | Nov 12 | Nov 30 | Dec 19 |
| Hard (28°F) | Nov 29 | Dec 15 | Jan 19 |
| Severe (24°F) | Dec 5 | Dec 26 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 27 | Nov 1 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 22 | Nov 26 |
| 32°F | Nov 12 | Nov 18 | Nov 23 | Nov 27 | Nov 30 | Dec 2 | Dec 5 | Dec 11 | Dec 19 |
| 28°F | Nov 29 | Dec 2 | Dec 6 | Dec 10 | Dec 15 | Dec 20 | Dec 27 | Jan 3 | Jan 19 |
| 24°F | Dec 5 | Dec 11 | Dec 16 | Dec 21 | Dec 26 | Dec 31 | Jan 2 | Jan 8 | Jan 19 |
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: Markley Cove, Ca, about 7.9 miles away@if(!empty($station['elevation_ft'])), at 480 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 Moskowite Corner, CA?
On average, the last spring frost (32°F) around Moskowite Corner, CA is about Mar 6. In cooler years it can run later, so for a safer bet many gardeners wait until Jan 31.
When is the first frost in the fall?
The first fall frost around Moskowite Corner, CA typically arrives about Nov 30. 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 6 on average, or Jan 31 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 266 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 94558 Planting calendar → California frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026