Rialto, California planting calendar and frost dates

Frost dates in Rialto

NOAA U.S. Climate Normals 1991-2020 for Redlands, 7.3 miles SE of the city center and 359 feet higher. Low-lying and rural spots often frost later in spring and earlier in fall than airports and city centers. Rialto shares this station with San Bernardino, so the two cities have the same frost dates and planting calendar.

What to plant each month in Rialto

1. January

   Start indoors: ginger, peppers, ranunculus

   Plant or sow outdoors: asparagus, avocados, beets, black-eyed susans, blackberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, dahlias, dill, figs, garden mums, gladioli, grapes, green onions, lavenders, leeks, lettuce, lilies, marigolds, mints, nasturtiums, onions, oregano, parsley, petunias, potatoes, radishes, ranunculus, rosemary, roses, sage, snapdragons, spinach, sunflowers, sweet corn, swiss chard, thyme, turnips

   Plant for fall: crocuses, garlic, hyacinths, ornamental alliums, tulips

2. February

   Start indoors: basil, celery, eggplants, peppers, tomatoes

   Plant or sow outdoors: avocados, chives, cilantro, dahlias, dill, garden mums, ginger, gladioli, grapes, green onions, lavenders, lettuce, lilies, marigolds, mints, nasturtiums, oregano, parsley, petunias, ranunculus, rosemary, sage, spinach, sunflowers, sweet corn, swiss chard, thyme

3. March

   Start indoors: basil, cantaloupes, cosmos, cucumbers, okra, pumpkins, watermelons, winter squash, zucchini

   Plant or sow outdoors: ginger, st. augustinegrass

4. April

   Start indoors: cosmos, okra

   Plant or sow outdoors: basil, cantaloupes, cucumbers, eggplants, green beans, peppers, pumpkins, st. augustinegrass, tomatoes, watermelons, winter squash, zucchini

5. May

   Start indoors: zinnias

   Plant or sow outdoors: bermudagrass, celery, centipedegrass, cosmos, okra, peanuts, sweet potatoes, zoysiagrass

6. June

   Plant or sow outdoors: bermudagrass, centipedegrass, zinnias, zoysiagrass

7. August

   Plant for fall: peppers, potatoes

8. September

   Plant for fall: bearded irises, brussels sprouts, carrots, collard greens, cucumbers, green beans, lettuce, peas, peppers, potatoes, snapdragons, sweet corn, swiss chard, tomatoes, zucchini

9. October

   Start indoors: onions

   Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, collard greens, coneflowers, cucumbers, daylilies, green beans, hostas, hydrangeas, kale, lettuce, peas, radishes, roses, saffron, snapdragons, spinach, swiss chard, turnips, zucchini

10. November

    Start indoors: broccoli, cabbages, cauliflower, collard greens, kale, leeks, onions, oregano, parsley, petunias, ranunculus, rosemary, snapdragons

    Plant for fall: azaleas, bearded irises, 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

11. December

    Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, chives, cilantro, collard greens, ginger, leeks, lettuce, marigolds, nasturtiums, oregano, parsley, petunias, ranunculus, rosemary, sage, snapdragons, spinach, swiss chard

    Plant or sow outdoors: asparagus, beets, black-eyed susans, blackberries, blueberries, broccoli, cauliflower, chives, cilantro, collard greens, figs, garlic, gladioli, grapes, grass seed, green onions, hollyhocks, kale, kentucky bluegrass, leeks, onions, peas, poppies, radishes, ranunculus, raspberries, rhubarb, roses, spinach, strawberries, sweet peas, swiss chard, tall fescue, turnips, wildflowers

    Plant for fall: crocuses, daffodils, garlic, hyacinths, lilies, ornamental alliums, peonies, tulips

Frost dates and zones by ZIP code in Rialto

All 4 of Rialto's main ZIP codes take their frost dates from Redlands, so the dates on this page apply across the city. Every one of them is in zone 10a.

Redlands also supplies the frost dates for San Bernardino, Moreno Valley, Perris, Redlands, Highland and Yucaipa and 1 more cities, so their planting calendars match Rialto's.

Planting dates for popular crops in Rialto

Nearby cities

• Fontana, CA zone 10a, last frost Jan 9
• San Bernardino, CA zone 10a, last frost Jan 27
• Colton, CA zone 10a, last frost Jan 27
• Jurupa Valley, CA zone 10a, last frost Jan 9
• Rancho Cucamonga, CA zone 10a
• Riverside, CA zone 10a, last frost Jan 9