Ramona, CA planting zone & frost dates
Ramona is in USDA hardiness zone 9b. The last spring frost usually comes around March 19 and the first fall frost around November 23, for a growing season of about 248 days.
Planting calendar for Ramona
Dates are counted from the average last spring frost (March 19) 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: Jan 22 – Feb 5 Transplant outdoors: Mar 26 – Apr 2 |
| Peppers | Start seeds indoors: Jan 8 – Jan 22 Transplant outdoors: Apr 2 – Apr 9 |
| Eggplant | Start seeds indoors: Jan 8 – Jan 22 Transplant outdoors: Apr 2 – Apr 9 |
| Broccoli | Start seeds indoors: Jan 8 – Jan 22 Transplant outdoors: Feb 19 – Mar 5 |
| Cabbage | Start seeds indoors: Jan 8 – Jan 22 Transplant outdoors: Feb 19 – Mar 5 |
| Onions (sets) | Plant outdoors: Feb 19 – Mar 5 |
| Peas | Sow outdoors: Feb 5 – Feb 19 |
| Spinach | Sow outdoors: Feb 5 – Feb 19 |
| Lettuce | Sow outdoors: Feb 19 – Mar 5 |
| Carrots | Sow outdoors: Feb 19 – Mar 5 |
| Potatoes | Plant outdoors: Feb 19 – Mar 5 |
| Beans | Sow outdoors: Mar 26 – Apr 2 |
| Sweet corn | Sow outdoors: Mar 26 – Apr 2 |
| Cucumbers | Sow outdoors: Mar 26 – Apr 2 |
| Squash & zucchini | Sow outdoors: Mar 26 – Apr 2 |
| Basil | Start seeds indoors: Feb 5 – Feb 19 Transplant outdoors: Mar 26 – Apr 2 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 28 (8 weeks before the average first fall frost on Nov 23).
Useful for zone 9b 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 | Feb 15 | Mar 19 | Apr 10 |
| First 32°F frost in fall is before | Dec 10 | Nov 23 | Nov 6 |
How to read it: in spring there is a 10% chance of a frost after April 10, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 6. A hard freeze (28°F) usually ends around February 7.
Hardiness zone by ZIP code in Ramona
- 92065 zone 9b
Nearby cities
- San Diego Country Estates zone 9b, last frost Mar 4
- Poway zone 10a
- Lakeside zone 10a, last frost Jan 6
- Winter Gardens zone 10a, last frost Jan 6
- Santee zone 10a, last frost Jan 6
- Alpine zone 9b, last frost Feb 12
- Escondido zone 10a
- Bostonia zone 10a, last frost Jan 6
Questions
What growing zone is Ramona, CA?
Ramona is in USDA Plant Hardiness Zone 9b (average extreme winter low 25°F to 30°F), according to the USDA 2023 map.
When is the last frost in Ramona?
The average last spring frost (32°F) in Ramona is March 19. There is still a 10% chance of frost until April 10.
When can I plant tomatoes in Ramona?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 26 – Apr 2. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Ramona Ap, CA (USW00053120), 4.5 km (2.8 mi) from the city center, elevation 425 m, based on 22 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.