Frost dates · USDA zone 10a
Frost dates for San Leandro, CA
San Leandro, CA sees its last 32 °F night of spring around January 7 and its first of fall around December 23 — a 356-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Dec 13 (prior winter) | Jan 24 (next year) |
| Median — 1 year in 2 | Jan 7 | Dec 23 |
| 1 year in 10 | Feb 8 | Nov 30 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 356 days median, at least 320 in 9 years of 10, no freeze at all in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Dec 30 (prior winter) and first of Dec 28.
San Leandro planting calendar, 2027
Every row runs from the median last frost (Jan 7) and median first frost (Dec 23) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Oct 15 | Dec 10 | Mar 30 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Jan 7 | Feb 6 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Dec 24 | Dec 24 | Feb 7 | 45 from sow |
| Genovese BasilGenovese | Dec 10 | Jan 21 | Mar 22 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Nov 12 | Jan 14 | Mar 30 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Oct 29 | Jan 21 | Apr 26 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Nov 12 | Jan 14 | Mar 30 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Nov 12 | Jan 14 | Apr 4 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Nov 12 | Jan 14 | Apr 4 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Dec 24 | Dec 24 | Mar 4 | 70 from sow |
| TomatilloToma Verde | Nov 26 | Jan 14 | Mar 25 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Nov 26 | Jan 14 | Mar 30 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Nov 26 | Jan 14 | Apr 4 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can San Leandro grow?
Each sauce, scheduled for a San Leandro container garden: when the first seeds go in and when enough fruit has ripened for one batch.
San Leandro frost questions
When is the last frost in San Leandro, CA?
The median last 32 °F freeze at OAKLAND METRO INTL AP, CA is January 7: half of years see a later one. One year in ten, a freeze still comes after February 8; nine years in ten, it comes after December 13 (prior winter). Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in San Leandro, CA?
The median first 32 °F freeze of fall is December 23. One year in ten it arrives before November 30; nine years in ten, before January 24 (next year).
How long is the growing season in San Leandro, CA?
356 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 320 days; one year in ten, no freeze at all.
What growing zone is San Leandro, CA?
USDA hardiness zone 10a, per the 2023 USDA Plant Hardiness Zone Map for ZIP 94577. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in San Leandro, CA?
Start Roma VF (determinate paste) seeds indoors around Nov 26 and transplant around Jan 14, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Feb 8. First ripe fruit lands around Mar 30.
When should I plant peppers in San Leandro, CA?
Sow jalapeño indoors on a heat mat around Nov 12; transplant no earlier than Jan 14, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Mar 30.
Nearby in California
- Oaklandfrost rare
- Alamedalast frost Jan 7
- Haywardlast frost Jan 2
- Union Citylast frost Jan 2
- South San Franciscolast frost Dec 29
- San Mateolast frost Dec 29
All California frost dates → · How frost-date math drives a sowing calendar →