Frost dates for 93260Posey, CA
The average last spring frost in Posey is May 11 and the average first fall frost is October 17, giving a typical growing season of about 155 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 11
- Average first fall frost
- Oct 17
- Growing season
- 155 days
Safer after Jun 6 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 196 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 14 · Jun 3 · Jun 18 | Sep 13 · Oct 2 · Oct 19 | 119 days | 100% |
| Frost / freeze (32°F) | Apr 21 · May 11 · Jun 6 | Sep 30 · Oct 17 · Nov 4 | 155 days | 100% |
| Hard freeze (28°F) | Mar 28 · Apr 19 · May 11 | Oct 15 · Nov 2 · Nov 19 | 194 days | 100% |
Planting calendar for Posey
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 10 – Jun 16 |
| Tomatoes | Transplant outdoors | May 27 – Jun 27 |
| Peppers | Start seeds indoors | Apr 10 – May 11 |
| Peppers | Transplant outdoors | Jun 10 – Jul 11 |
| Eggplant | Start seeds indoors | Apr 27 – May 26 |
| Eggplant | Transplant outdoors | Jun 10 – Jul 11 |
| Cucumbers | Sow outdoors | Jun 10 – Jul 7 |
| Summer squash | Sow outdoors | May 27 – Jul 11 |
| Winter squash & pumpkins | Sow outdoors | Jun 10 – Jul 11 |
| Snap beans | Sow outdoors | May 27 – Jul 30 |
| Sweet corn | Sow outdoors | May 27 – Jun 27 |
| Watermelon & cantaloupe | Sow outdoors | Jun 10 – Jul 11 |
| Okra | Sow outdoors | Jun 3 – Jun 26 |
| Peas | Sow outdoors (spring) | Apr 10 – May 26 |
| Potatoes | Plant outdoors (spring) | Apr 10 – Jun 10 |
| Onions | Start seeds indoors (spring) | Feb 27 – Mar 26 |
| Onions | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (spring) | Mar 23 – Apr 26 |
| Broccoli | Transplant outdoors (spring) | Apr 27 – May 26 |
| Broccoli | Start seeds indoors (fall) | Jun 17 – Jun 27 |
| Broccoli | Transplant outdoors (fall) | Jul 17 – Jul 28 |
| Cabbage | Start seeds indoors (spring) | Mar 13 – Apr 10 |
| Cabbage | Transplant outdoors (spring) | Apr 10 – May 11 |
| Cabbage | Start seeds indoors (fall) | Jun 7 – Jul 7 |
| Cabbage | Transplant outdoors (fall) | Jul 7 – Aug 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 10 – Jun 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 7 – Aug 23 |
| Spinach | Sow outdoors (spring) | Apr 3 – May 17 |
| Spinach | Sow outdoors (fall) | Jul 24 – Aug 28 |
| Radishes | Sow outdoors (spring) | Apr 10 – May 31 |
| Radishes | Sow outdoors (fall) | Jul 7 – Sep 7 |
| Kale | Sow outdoors (spring) | Apr 27 – May 17 |
| Kale | Sow outdoors (fall) | Jun 30 – Aug 7 |
| Carrots | Sow outdoors (spring) | May 11 – Jun 26 |
| Carrots | Sow outdoors (fall) | Jun 7 – Jul 23 |
| Garlic | Plant outdoors (fall) | Oct 7 – Nov 7 |
Where these dates come from
ZIP code 93260 is matched to the NOAA station Glennville, CA, 10.2 km away, at 3,140 ft elevation (833 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Glennville, CA (used) | 3,140 ft | May 11 | Oct 17 |
| Kern River Ph 3, CA | 2,703 ft | Apr 7 | Nov 11 |
| S Lake Fs, CA | 2,654 ft | Apr 5 | Nov 3 |
| Porterville, CA | 393 ft | Jan 20 | Dec 13 |
Frost dates near Posey
- California Hot Springs, CA 93207 · last May 11, first Oct 17
- Glennville, CA 93226 · last May 11, first Oct 17
- Woody, CA 93287 · last May 11, first Oct 17
- Wofford Heights, CA 93285 · last May 11, first Oct 17
- Kernville, CA 93238 · last May 11, first Oct 17
- Lake Isabella, CA 93240 · last Apr 5, first Nov 3
- Bodfish, CA 93205 · last Apr 5, first Nov 3
- Ducor, CA 93218 · last Feb 20, first Nov 30
Frequently asked questions
- When is the last frost in Posey, CA?
- For ZIP code 93260, the average last spring frost (32°F) is May 11, based on NOAA 1991-2020 climate normals for the Glennville, CA weather station. There is a 1-in-10 chance of a frost after June 6.
- When is the first frost in Posey, CA?
- The average first fall frost (32°F) is October 17. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 93260?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 155 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.