When to plant in San Leandro, CA
USDA Zone 10aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for San Leandro, California — all computed from San Leandro's nearest NOAA weather station.
A generous ~350-day season lets San Leandro gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 10a, frost is a minor factor for San Leandro — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
OAKLAND METRO INTL AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are San Leandro’s own odds, recorded at OAKLAND METRO INTL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 7 | Feb 8 | Jan 3 | Nov 15 | Dec 4 | Jan 5 |
| 32°F | Feb 8 | Jan 7 | Dec 13 | Nov 30 | Dec 23 | Jan 24 |
| 28°F | Jan 15 | Dec 30 | Dec 9 | Dec 6 | Dec 28 | Jan 12 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in San Leandro, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
San Leandro planting FAQ
When is the last spring frost in San Leandro, CA?
On average, the last spring frost in San Leandro is around January 7 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in San Leandro, CA?
Expect San Leandro's first fall frost near December 23 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is San Leandro in?
San Leandro is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in San Leandro?
San Leandro has about 350 frost-free days — a long growing season — between the average last spring frost (January 7) and first fall frost (December 23).
When should I plant tomatoes in San Leandro?
For San Leandro, sow tomatoes indoors about November 12–November 26 and move the seedlings out around January 14, after the last spring frost.
Never miss a window in San Leandro
An email when it’s time to start seeds, transplant, and sow — timed to San Leandro’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- San Lorenzo · 4 km
- Ashland · 4 km
- Cherryland · 6 km
- Castro Valley · 9 km
- Oakland · 9 km
- Alameda · 10 km
- Hayward · 10 km
- Fairview · 11 km
Frost dates recorded at OAKLAND METRO INTL AP, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in San Leandro, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00023230. Retrieved from https://blissgarden.com/california/san-leandro.