Corona, CA planting zone & frost dates
Corona is in USDA hardiness zone 10a. The last spring frost usually comes around January 17 and the first fall frost around December 19, for a growing season of about 335 days.
Planting calendar for Corona
Dates are counted from the average last spring frost (January 17) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Nov 22 – Dec 6 Transplant outdoors: Jan 24 – Jan 31 |
| Peppers | Start seeds indoors: Nov 8 – Nov 22 Transplant outdoors: Jan 31 – Feb 7 |
| Eggplant | Start seeds indoors: Nov 8 – Nov 22 Transplant outdoors: Jan 31 – Feb 7 |
| Broccoli | Start seeds indoors: Nov 8 – Nov 22 Transplant outdoors: Dec 20 – Jan 3 |
| Cabbage | Start seeds indoors: Nov 8 – Nov 22 Transplant outdoors: Dec 20 – Jan 3 |
| Onions (sets) | Plant outdoors: Dec 20 – Jan 3 |
| Peas | Sow outdoors: Dec 6 – Dec 20 |
| Spinach | Sow outdoors: Dec 6 – Dec 20 |
| Lettuce | Sow outdoors: Dec 20 – Jan 3 |
| Carrots | Sow outdoors: Dec 20 – Jan 3 |
| Potatoes | Plant outdoors: Dec 20 – Jan 3 |
| Beans | Sow outdoors: Jan 24 – Jan 31 |
| Sweet corn | Sow outdoors: Jan 24 – Jan 31 |
| Cucumbers | Sow outdoors: Jan 24 – Jan 31 |
| Squash & zucchini | Sow outdoors: Jan 24 – Jan 31 |
| Basil | Start seeds indoors: Dec 6 – Dec 20 Transplant outdoors: Jan 24 – Jan 31 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 24 (8 weeks before the average first fall frost on Dec 19).
Useful for zone 10a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Dec 18 | Jan 17 | Feb 22 |
| First 32°F frost in fall is before | Jan 17 | Dec 19 | Nov 27 |
How to read it: in spring there is a 10% chance of a frost after February 22, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 27. A hard freeze (28°F) usually ends around January 3.
Hardiness zone by ZIP code in Corona
- 92877 zone 10a
- 92879 zone 10a
- 92880 zone 10a
- 92881 zone 10a
- 92882 zone 10a
- 92883 zone 10a
Nearby cities
- Home Gardens zone 10a
- Norco zone 10a, last frost Jan 17
- Eastvale zone 10a, last frost Jan 17
- Jurupa Valley zone 10a
- Pedley zone 10a
- Glen Avon zone 10a
- Chino zone 10a, last frost Jan 17
- Riverside zone 10a, last frost Jan 9
Questions
What growing zone is Corona, CA?
Corona is in USDA Plant Hardiness Zone 10a (average extreme winter low 30°F to 35°F), according to the USDA 2023 map.
When is the last frost in Corona?
The average last spring frost (32°F) in Corona is January 17. There is still a 10% chance of frost until February 22.
When can I plant tomatoes in Corona?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Jan 24 – Jan 31. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Chino Ap, CA (USW00003179), 12.8 km (7.9 mi) from the city center, elevation 198 m, based on 18 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.