San Leandro, CA planting zone & frost dates
San Leandro is in USDA hardiness zone 10a. The last spring frost usually comes around January 7 and the first fall frost around December 23, for a growing season of about 356 days.
Planting calendar for San Leandro
Dates are counted from the average last spring frost (January 7) 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 12 – Nov 26 Transplant outdoors: Jan 14 – Jan 21 |
| Peppers | Start seeds indoors: Oct 29 – Nov 12 Transplant outdoors: Jan 21 – Jan 28 |
| Eggplant | Start seeds indoors: Oct 29 – Nov 12 Transplant outdoors: Jan 21 – Jan 28 |
| Broccoli | Start seeds indoors: Oct 29 – Nov 12 Transplant outdoors: Dec 10 – Dec 24 |
| Cabbage | Start seeds indoors: Oct 29 – Nov 12 Transplant outdoors: Dec 10 – Dec 24 |
| Onions (sets) | Plant outdoors: Dec 10 – Dec 24 |
| Peas | Sow outdoors: Nov 26 – Dec 10 |
| Spinach | Sow outdoors: Nov 26 – Dec 10 |
| Lettuce | Sow outdoors: Dec 10 – Dec 24 |
| Carrots | Sow outdoors: Dec 10 – Dec 24 |
| Potatoes | Plant outdoors: Dec 10 – Dec 24 |
| Beans | Sow outdoors: Jan 14 – Jan 21 |
| Sweet corn | Sow outdoors: Jan 14 – Jan 21 |
| Cucumbers | Sow outdoors: Jan 14 – Jan 21 |
| Squash & zucchini | Sow outdoors: Jan 14 – Jan 21 |
| Basil | Start seeds indoors: Nov 26 – Dec 10 Transplant outdoors: Jan 14 – Jan 21 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 28 (8 weeks before the average first fall frost on Dec 23).
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 13 | Jan 7 | Feb 8 |
| First 32°F frost in fall is before | Jan 24 | Dec 23 | Nov 30 |
How to read it: in spring there is a 10% chance of a frost after February 8, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 30. A hard freeze (28°F) usually ends around December 30.
Hardiness zone by ZIP code in San Leandro
- 94577 zone 10a
- 94578 zone 10a
- 94579 zone 10a
Nearby cities
- Ashland zone 10a
- San Lorenzo zone 10a
- Cherryland zone 10a
- Castro Valley zone 10a
- Hayward zone 10a
- Moraga zone 9b
- Alameda zone 10a
- Fairview zone 9b
Questions
What growing zone is San Leandro, CA?
San Leandro 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 San Leandro?
The average last spring frost (32°F) in San Leandro is January 7. There is still a 10% chance of frost until February 8.
When can I plant tomatoes in San Leandro?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Jan 14 – Jan 21. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Oakland Metro Intl Ap, CA (USW00023230), 5.7 km (3.5 mi) from the city center, elevation 2 m, based on 21 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.