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St. Joseph, Missouri planting calendar and frost dates

St. Joseph is in USDA hardiness zone 6a. The last spring frost typically comes around April 19 and the first fall frost around October 17, giving about 180 frost-free days a year.

Hardiness zone
Zone 6a
Typical last frost
April 19
Typical first frost
October 17
Frost-free season
180 days

Frost dates in St. Joseph

Last spring frost

  • April 5Risky: frost later than this in 9 years out of 10
  • April 19Typical: a later frost in half of years
  • May 3Safe: a later frost only 1 year in 10

First fall frost

  • September 30Risky: frost earlier than this 1 year in 10
  • October 17Typical: an earlier frost in half of years
  • October 30Late: frost before this in 9 years out of 10

The growing season between the typical last and first frosts is about 180 days. Frost here means a low of 32°F at the weather station. A hard freeze (28°F), which damages most hardy crops too, typically ends around April 9 and returns around October 26.

NOAA U.S. Climate Normals 1991-2020 for St Joseph Rosecrans Airport, 6.5 miles W of the city center and 193 feet lower. 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 St. Joseph

  1. January

    Start indoors: collard greens, leeks, onions, petunias, ranunculus

  2. February

    Start indoors: black-eyed susans, broccoli, cabbages, cauliflower, celery, chives, collard greens, ginger, kale, leeks, lettuce, marigolds, onions, oregano, parsley, peppers, petunias, ranunculus, rosemary, sage, snapdragons

  3. March

    Start indoors: basil, black-eyed susans, cabbages, cantaloupes, cauliflower, celery, chives, cilantro, collard greens, eggplants, ginger, lettuce, marigolds, nasturtiums, peppers, ranunculus, sage, snapdragons, spinach, swiss chard, tomatoes, watermelons

    Plant or sow outdoors: beets, black-eyed susans, blackberries, blueberries, broccoli, cabbages, carrots, cauliflower, chives, cilantro, collard greens, figs, garlic, gladioli, grapes, grass seed, hollyhocks, kale, leeks, lettuce, onions, parsley, peas, poppies, radishes, ranunculus, raspberries, rhubarb, roses, spinach, strawberries, swiss chard, turnips, wildflowers

  4. April

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

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

  5. May

    Start indoors: zinnias

    Plant or sow outdoors: asparagus, basil, bermudagrass, cantaloupes, celery, centipedegrass, cosmos, cucumbers, eggplants, garden mums, ginger, grapes, green beans, green onions, kentucky bluegrass, lavenders, lilies, marigolds, mints, nasturtiums, okra, oregano, parsley, peanuts, peppers, perennial ryegrass, petunias, pumpkins, rosemary, sage, st. augustinegrass, sunflowers, sweet corn, sweet peas, sweet potatoes, tall fescue, thyme, tomatoes, watermelons, winter squash, zinnias, zoysiagrass, zucchini

  6. June

    Plant or sow outdoors: bermudagrass, centipedegrass, green onions, okra, st. augustinegrass, zinnias, zoysiagrass

  7. July

    Plant for fall: bearded irises, brussels sprouts, carrots, collard greens, lettuce, peas, snapdragons, swiss chard

  8. August

    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

  9. September

    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

  10. October

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

  11. December

    Start indoors: onions

Frost dates and zones by ZIP code in St. Joseph

All 6 of St. Joseph's main ZIP codes take their frost dates from St Joseph Rosecrans Airport, so the dates on this page apply across the city. Every one of them is in zone 6a.

ZIP codeZoneWeather stationTypical last frostTypical first frost
645016aSt Joseph Rosecrans Airport, 4.2 mi WApr 19Oct 17
645036aSt Joseph Rosecrans Airport, 4.5 mi WNWApr 19Oct 17
645046aSt Joseph Rosecrans Airport, 5.8 mi NApr 19Oct 17
645056aSt Joseph Rosecrans Airport, 7.3 mi SWApr 19Oct 17
645066aSt Joseph Rosecrans Airport, 6.5 mi WApr 19Oct 17
645076aSt Joseph Rosecrans Airport, 10 mi WNWApr 19Oct 17

Planting dates for popular crops in St. Joseph

PlantStart indoorsPlant or sow outdoorsFall planting
TomatoesMar 9 to 23May 4 to 18—
Strawberries—Mar 8 to 22—
LettuceFeb 22 to Mar 8Apr 12 to 26Jul 18 to Aug 22
CilantroMar 8 to 22Apr 19 to 26—
BasilMar 16 to 30May 4 to 11—
Potatoes—Apr 4 to 11—
Garlic—Mar 8 to 22Oct 17 to 31
OnionsDec 28 to Feb 8Mar 22 to Apr 5—
CucumbersApr 6 to 20May 4 to 18—
PumpkinsApr 6 to 20May 4 to 18—
PeppersFeb 16 to Mar 16May 4 to 18—
Carrots—Mar 29 to Apr 19Jul 25 to Aug 15
Sweet Potatoes—May 17 to 24—
WatermelonsMar 30 to Apr 13May 4 to 18—
Sweet Corn—Apr 19 to May 3—
Green Beans—May 4 to 18—
ZucchiniApr 6 to 20May 4 to 18—
BroccoliFeb 1 to 22Mar 22 to Apr 5Aug 1 to 29
Peas—Mar 8 to 22Jul 25 to Aug 8
SpinachMar 8 to 15Apr 12 to 26Aug 8 to Sep 12
Sunflowers—Apr 19 to May 10—
ZinniasMay 2 to 9May 30 to Jun 13—
Tulips——Sep 5 to Oct 31
Daffodils——Sep 5 to Oct 17
Grass Seed—Mar 8 to 22Sep 5 to 19

Nearby cities

Planting in MissouriAbout zone 6aPrintable calendar for St. Joseph

Questions

When is the last frost in St. Joseph?

Around April 19 in a typical year, based on NOAA's 1991-2020 records for St Joseph Rosecrans Airport. There is still a 1 in 10 chance of frost after May 3.

What planting zone is St. Joseph in?

USDA hardiness zone 6a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.

When should I plant tomatoes in St. Joseph?

Start seeds indoors March 9 to 23 and set plants out May 4 to 18.

When is the first frost in St. Joseph?

Around October 17 in a typical year, and before September 30 about 1 year in 10.