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Bloomington, Indiana planting calendar and frost dates

Bloomington is in USDA hardiness zone 6b. The last spring frost typically comes around April 15 and the first fall frost around October 26, giving about 192 frost-free days a year.

Hardiness zone
Zone 6b
Typical last frost
April 15
Typical first frost
October 26
Frost-free season
192 days

Frost dates in Bloomington

Last spring frost

  • March 31Risky: frost later than this in 9 years out of 10
  • April 15Typical: a later frost in half of years
  • May 3Safe: a later frost only 1 year in 10

First fall frost

  • October 11Risky: frost earlier than this 1 year in 10
  • October 26Typical: an earlier frost in half of years
  • November 9Late: frost before this in 9 years out of 10

The growing season between the typical last and first frosts is about 192 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 2 and returns around November 4.

NOAA U.S. Climate Normals 1991-2020 for Bloomington Indiana Univ, 6.5 miles NW of the city center and 223 feet higher. 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 Bloomington

  1. January

    Start indoors: broccoli, cauliflower, collard greens, kale, 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, 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, green beans, green onions, kentucky bluegrass, okra, peanuts, peppers, perennial ryegrass, pumpkins, st. augustinegrass, sunflowers, sweet peas, sweet potatoes, tall fescue, tomatoes, watermelons, winter squash, zoysiagrass, zucchini

  6. June

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

  7. July

    Plant for fall: brussels sprouts, collard greens, lettuce, 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, 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

  10. October

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

  11. November

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

  12. December

    Start indoors: onions

Frost dates and zones by ZIP code in Bloomington

Bloomington's 4 main ZIP codes take their frost dates from 2 different NOAA stations: the typical last frost ranges from April 15 in 47401 to April 17 in 47403. Every one of them is in zone 6b.

ZIP codeZoneWeather stationTypical last frostTypical first frost
474016bBloomington Indiana Univ, 6.5 mi NWApr 15Oct 26
474036bBloomington Monroe Co Airport, 3.3 mi NApr 17Oct 22
474046bBloomington Indiana Univ, 4.9 mi SEApr 15Oct 26
474086bBloomington Indiana Univ, 4.8 mi SWApr 15Oct 26

Planting dates for popular crops in Bloomington

PlantStart indoorsPlant or sow outdoorsFall planting
TomatoesMar 10 to 24May 5 to 19—
Strawberries—Mar 4 to 18—
LettuceFeb 18 to Mar 4Apr 8 to 22Jul 27 to Aug 31
CilantroMar 4 to 18Apr 15 to 22—
BasilMar 17 to 31May 5 to 12—
Potatoes—Apr 7 to 14—
Garlic—Mar 4 to 18Oct 26 to Nov 9
OnionsDec 24 to Feb 4Mar 18 to Apr 1—
CucumbersApr 7 to 21May 5 to 19—
PumpkinsApr 7 to 21May 5 to 19—
PeppersFeb 17 to Mar 17May 5 to 19—
Carrots—Mar 25 to Apr 15Aug 3 to 24
Sweet Potatoes—May 22 to 29—
WatermelonsMar 31 to Apr 14May 5 to 19—
Sweet Corn—Apr 15 to 29—
Green Beans—May 5 to 19—
ZucchiniApr 7 to 21May 5 to 19—
BroccoliJan 28 to Feb 18Mar 18 to Apr 1Aug 10 to Sep 7
Peas—Mar 4 to 18Aug 3 to 17
SpinachMar 4 to 11Apr 8 to 22Aug 17 to Sep 21
Sunflowers—Apr 15 to May 6—
ZinniasMay 11 to 18Jun 8 to 22—
Tulips——Sep 14 to Nov 9
Daffodils——Sep 14 to Oct 26
Grass Seed—Mar 4 to 18Sep 14 to 28

Nearby cities

Planting in IndianaAbout zone 6bPrintable calendar for Bloomington

Questions

When is the last frost in Bloomington?

Around April 15 in a typical year, based on NOAA's 1991-2020 records for Bloomington Indiana Univ. There is still a 1 in 10 chance of frost after May 3.

What planting zone is Bloomington in?

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

When should I plant tomatoes in Bloomington?

Start seeds indoors March 10 to 24 and set plants out May 5 to 19.

When is the first frost in Bloomington?

Around October 26 in a typical year, and before October 11 about 1 year in 10.