San Leandro, California planting calendar and frost dates
San Leandro is in USDA hardiness zone 10a. The last spring frost typically comes around January 7 and the first fall frost around December 23, giving about 356 frost-free days a year.
- Hardiness zone
- Zone 10a
- Typical last frost
- January 7
- Typical first frost
- December 23
- Frost-free season
- 356 days
Frost dates in San Leandro
Last spring frost
- December 13Risky: frost later than this in 9 years out of 10
- January 7Typical: a later frost in half of years
- February 8Safe: a later frost only 1 year in 10
First fall frost
- November 30Risky: frost earlier than this 1 year in 10
- December 23Typical: an earlier frost in half of years
- New yearLate: in about 1 year in 10, the first frost waits until after December 31
The growing season between the typical last and first frosts is about 356 days. Frost here means a low of 32°F at the weather station.
NOAA U.S. Climate Normals 1991-2020 for Oakland Metro International Airport, 2.8 miles W of the city center. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers.
What to plant each month in San Leandro
January
Start indoors: ginger
Plant or sow outdoors: asparagus, avocados, beets, carrots, celery, chives, cilantro, cosmos, dahlias, dill, figs, garden mums, gladioli, grapes, green onions, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, okra, oregano, parsley, peanuts, petunias, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, sweet potatoes, swiss chard, thyme, zinnias
Plant for fall: crocuses, garlic, hyacinths, ornamental alliums, tulips
February
Plant or sow outdoors: avocados, bermudagrass, centipedegrass, garden mums, green onions, st. augustinegrass, sunflowers, sweet corn, zoysiagrass
March
Start indoors: basil, eggplants, peppers, tomatoes
Plant or sow outdoors: bermudagrass, centipedegrass, ginger, st. augustinegrass, zoysiagrass
April
Start indoors: basil, cantaloupes, cucumbers, pumpkins, tomatoes, watermelons, winter squash, zucchini
May
Start indoors: cucumbers, pumpkins, winter squash, zucchini
Plant or sow outdoors: basil, cantaloupes, cucumbers, eggplants, green beans, peppers, pumpkins, tomatoes, watermelons, winter squash, zucchini
June
Plant or sow outdoors: cantaloupes, cucumbers, eggplants, green beans, peppers, pumpkins, tomatoes, watermelons, winter squash, zucchini
September
Start indoors: onions
Plant for fall: bearded irises, brussels sprouts, carrots, collard greens, lettuce, peas, potatoes, snapdragons, sweet corn, swiss chard
October
Start indoors: broccoli, cabbages, cauliflower, celery, collard greens, kale, leeks, onions, oregano, parsley, petunias, ranunculus, rosemary, snapdragons
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, collard greens, coneflowers, daylilies, hostas, hydrangeas, kale, lettuce, peas, radishes, roses, saffron, snapdragons, spinach, swiss chard, turnips
November
Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, chives, cilantro, collard greens, cosmos, kale, leeks, lettuce, marigolds, nasturtiums, okra, oregano, parsley, petunias, ranunculus, rosemary, sage, snapdragons, spinach, swiss chard
Plant or sow outdoors: asparagus, black-eyed susans, blueberries, garlic, grapes, grass seed, green onions, hollyhocks, kentucky bluegrass, onions, peas, poppies, raspberries, rhubarb, strawberries, sweet peas, tall fescue, turnips, wildflowers
Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, hydrangeas, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, spinach, tall fescue, tulips, turnips
December
Start indoors: cilantro, cosmos, marigolds, nasturtiums, okra, ranunculus, spinach, swiss chard, zinnias
Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garlic, gladioli, grapes, grass seed, green onions, hollyhocks, kale, kentucky bluegrass, leeks, lettuce, onions, parsley, peas, peppers, poppies, potatoes, radishes, ranunculus, raspberries, rhubarb, roses, snapdragons, spinach, strawberries, sweet peas, swiss chard, tall fescue, turnips, wildflowers
Plant for fall: crocuses, daffodils, daylilies, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips
Frost dates and zones by ZIP code in San Leandro
San Leandro's 3 main ZIP codes take their frost dates from 2 different NOAA stations. Every one of them is in zone 10a.
Planting dates for popular crops in San Leandro
| Plant | Start indoors | Plant or sow outdoors | Fall planting |
|---|---|---|---|
| Tomatoes | Mar 23 to Apr 6 | May 18 to Jun 1 | — |
| Strawberries | — | Nov 26 to Dec 10 | — |
| Lettuce | Nov 12 to 26 | Dec 31 to Jan 14 | Sep 23 to Oct 28 |
| Cilantro | Nov 26 to Dec 10 | Jan 7 to 14 | — |
| Basil | Mar 30 to Apr 13 | May 18 to 25 | — |
| Potatoes | — | Dec 17 to 24 | Sep 2 to 9 |
| Garlic | — | Nov 26 to Dec 10 | Dec 23 to Jan 6 |
| Onions | Sep 17 to Oct 29 | Dec 10 to 24 | — |
| Cucumbers | Apr 20 to May 4 | May 18 to Jun 1 | — |
| Pumpkins | Apr 20 to May 4 | May 18 to Jun 1 | — |
| Peppers | Mar 2 to 30 | May 18 to Jun 1 | — |
| Carrots | — | Dec 17 to Jan 7 | Sep 30 to Oct 21 |
| Sweet Potatoes | — | Jan 21 to 28 | — |
| Watermelons | Apr 13 to 27 | May 18 to Jun 1 | — |
| Sweet Corn | — | Jan 21 to Feb 4 | Sep 16 to 30 |
| Green Beans | — | May 18 to Jun 1 | — |
| Zucchini | Apr 20 to May 4 | May 18 to Jun 1 | — |
| Broccoli | Oct 22 to Nov 12 | Dec 10 to 24 | Oct 7 to Nov 4 |
| Peas | — | Nov 26 to Dec 10 | Sep 30 to Oct 14 |
| Spinach | Nov 26 to Dec 3 | Dec 31 to Jan 14 | Oct 14 to Nov 18 |
| Sunflowers | — | Jan 21 to Feb 11 | — |
| Zinnias | Dec 10 to 17 | Jan 7 to 21 | — |
| Tulips | — | — | Nov 11 to Jan 6 |
| Daffodils | — | — | Nov 11 to Dec 23 |
| Grass Seed | — | Nov 26 to Dec 10 | Nov 11 to 25 |
Nearby cities
- Oakland, CA zone 9b
- Alameda, CA zone 10a
- Hayward, CA zone 10a
- Union City, CA zone 10a
- South San Francisco, CA zone 10a
- San Mateo, CA zone 10a
Planting in CaliforniaAbout zone 10aPrintable calendar for San Leandro
Questions
When is the last frost in San Leandro?
Around January 7 in a typical year, based on NOAA's 1991-2020 records for Oakland Metro International Airport. There is still a 1 in 10 chance of frost after February 8.
What planting zone is San Leandro in?
USDA hardiness zone 10a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.
When should I plant tomatoes in San Leandro?
Start seeds indoors March 23 to April 6 and set plants out May 18 to June 1.
When is the first frost in San Leandro?
Around December 23 in a typical year, and before November 30 about 1 year in 10.