What planting zone is San Leandro, CA?

San Leandro is in USDA plant hardiness zone 10a (average annual extreme minimum temperature 30 to 35°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in San Leandro?

In San Leandro, CA the warmest month is September (avg high 77°F) and the coldest is December (avg low 42.9°F). It averages about 16″ of precipitation a year.

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San Leandro, CA Planting Calendar & Frost Dates

USDA hardiness zone 10a · ZIP 94579 · elevation 13′ · NOAA & USDA data

San Leandro sits in USDA zone 10a and is effectively frost-free — you can grow something outdoors year-round. The warmest month is September (avg high 77°F) and the coolest is December (avg low 42.9°F). Time plantings by the hot vs. cool season rather than by frost: grow heat-loving crops through the warm months and cool-season greens in the mild winter. The wettest month is December (3.2″).

Hardiness zone

10a

min temp 30 to 35°F

Frost

Frost-free

grow year-round

Warmest month

September

avg high 77°F

Month-by-month typical weather in San Leandro

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Hayward Air Terminal, CA (3.2 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	59.3	43.1	51.2	2.9	–
February	61.9	45.1	53.5	3.1	–
March	64.4	47.4	55.9	2.4	–
April	66.8	49.5	58.2	1.2	–
May	69.3	52.4	60.9	0.6	–
June	74	55.1	64.6	0.2	–
July	74.7	57.4	66.1	0	–
August	76.4	58.2	67.3	0.1	–
September	77	57.6	67.3	0.1	–
October	73.5	53.5	63.5	0.8	–
November	65.1	47.2	56.2	1.5	–
December	59.4	42.9	51.2	3.2	–

What to plant when in San Leandro

San Leandro is frost-free, so there's no last-frost date to time from. Grow cool-season crops (lettuce, peas, broccoli, carrots) in the cooler months and warm-season crops (tomatoes, peppers, beans, squash) through the warm season.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in California

Hayward, CA Union City, CA Oakland, CA Alameda, CA San Ramon, CA Fremont, CA San Mateo, CA Dublin, CA

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Hayward Air Terminal, CA, 3.2 mi (confidence: high). Monthly weather normals: Hayward Air Terminal, CA, 3.2 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.