Frost dates for 93592Trona, CA
The average last spring frost in Trona is February 15 and the average first fall frost is November 28, giving a typical growing season of about 285 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 15
- Average first fall frost
- Nov 28
- Growing season
- 285 days
Safer after Mar 4 (1-in-10 risk)
Possible by Nov 11 (1-in-10 risk)
First frost typically in 27 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) | Feb 12 · Mar 4 · Apr 4 | Nov 3 · Nov 17 · Dec 2 | 257 days | 100% |
| Frost / freeze (32°F) | Jan 21 · Feb 15 · Mar 4 | Nov 11 · Nov 28 · Dec 16 | 285 days | 100% |
| Hard freeze (28°F) | Dec 29 · Jan 23 · Feb 19 | Nov 18 · Dec 10 · Jan 2 | 321 days | 97% |
Planting calendar for Trona
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 | Jan 15 – Mar 23 |
| Tomatoes | Transplant outdoors | Mar 3 – Aug 8 |
| Peppers | Start seeds indoors | Jan 15 – Feb 15 |
| Peppers | Transplant outdoors | Mar 17 – Apr 17 |
| Eggplant | Start seeds indoors | Feb 1 – Mar 2 |
| Eggplant | Transplant outdoors | Mar 17 – Apr 17 |
| Cucumbers | Sow outdoors | Mar 17 – Aug 18 |
| Summer squash | Sow outdoors | Mar 3 – Apr 17 |
| Winter squash & pumpkins | Sow outdoors | Mar 17 – Apr 17 |
| Snap beans | Sow outdoors | Mar 3 – Sep 10 |
| Sweet corn | Sow outdoors | Mar 3 – Aug 8 |
| Watermelon & cantaloupe | Sow outdoors | Mar 17 – Apr 17 |
| Okra | Sow outdoors | Mar 10 – Apr 2 |
| Peas | Sow outdoors (spring) | Jan 15 – Mar 2 |
| Potatoes | Plant outdoors (spring) | Jan 15 – Mar 17 |
| Onions | Start seeds indoors (spring) | Dec 4 – Dec 31 |
| Onions | Transplant outdoors (spring) | Feb 1 – Mar 2 |
| Broccoli | Start seeds indoors (spring) | Dec 28 – Jan 31 |
| Broccoli | Transplant outdoors (spring) | Feb 1 – Mar 2 |
| Broccoli | Start seeds indoors (fall) | Jul 29 – Aug 8 |
| Broccoli | Transplant outdoors (fall) | Aug 28 – Sep 8 |
| Cabbage | Start seeds indoors (spring) | Dec 18 – Jan 15 |
| Cabbage | Transplant outdoors (spring) | Jan 15 – Feb 15 |
| Cabbage | Start seeds indoors (fall) | Jul 19 – Aug 18 |
| Cabbage | Transplant outdoors (fall) | Aug 18 – Sep 18 |
| Leaf lettuce | Sow outdoors (spring) | Jan 15 – Apr 2 |
| Leaf lettuce | Sow outdoors (fall) | Aug 18 – Oct 4 |
| Spinach | Sow outdoors (spring) | Jan 8 – Feb 21 |
| Spinach | Sow outdoors (fall) | Sep 4 – Oct 9 |
| Radishes | Sow outdoors (spring) | Jan 15 – Mar 7 |
| Radishes | Sow outdoors (fall) | Aug 18 – Oct 19 |
| Kale | Sow outdoors (spring) | Feb 1 – Feb 21 |
| Kale | Sow outdoors (fall) | Aug 11 – Sep 18 |
| Carrots | Sow outdoors (spring) | Feb 15 – Apr 2 |
| Carrots | Sow outdoors (fall) | Jul 19 – Sep 3 |
| Garlic | Plant outdoors (fall) | Nov 18 – Dec 19 |
Where these dates come from
ZIP code 93592 is matched to the NOAA station Trona, CA, 1.6 km away, at 1,695 ft elevation (48 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Trona, CA (used) | 1,695 ft | Feb 15 | Nov 28 |
| China Lake Naf, CA | 2,230 ft | Mar 11 | Nov 12 |
| Inyokern, CA | 2,430 ft | Mar 9 | Nov 20 |
| Randsburg, CA | 3,570 ft | Mar 19 | Nov 25 |
Frost dates near Trona
- Trona, CA 93562 · last Feb 15, first Nov 28
- Ridgecrest, CA 93555 · last Mar 11, first Nov 12
- Inyokern, CA 93527 · last Mar 9, first Nov 20
- Johannesburg, CA 93528 · last Mar 19, first Nov 25
- Red Mountain, CA 93558 · last Mar 19, first Nov 25
- Little Lake, CA 93542 · last Apr 17, first Nov 1
- Randsburg, CA 93554 · last Mar 11, first Nov 12
- Darwin, CA 93522 · last Apr 17, first Nov 1
Frequently asked questions
- When is the last frost in Trona, CA?
- For ZIP code 93592, the average last spring frost (32°F) is February 15, based on NOAA 1991-2020 climate normals for the Trona, CA weather station. There is a 1-in-10 chance of a frost after March 4.
- When is the first frost in Trona, CA?
- The average first fall frost (32°F) is November 28. There is a 1-in-10 chance of frost by November 11, so tender plants are at risk from that point on.
- How long is the growing season in 93592?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 285 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.