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Fort Smith, Arkansas planting calendar and frost dates

Fort Smith is in USDA hardiness zone 8a. The last spring frost typically comes around March 25 and the first fall frost around November 6, giving about 224 frost-free days a year.

Hardiness zone
Zone 8a
Typical last frost
March 25
Typical first frost
November 6
Frost-free season
224 days

Frost dates in Fort Smith

Last spring frost

  • March 4Risky: frost later than this in 9 years out of 10
  • March 25Typical: a later frost in half of years
  • April 11Safe: a later frost only 1 year in 10

First fall frost

  • October 23Risky: frost earlier than this 1 year in 10
  • November 6Typical: an earlier frost in half of years
  • November 21Late: frost before this in 9 years out of 10

The growing season between the typical last and first frosts is about 224 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 March 11 and returns around November 17.

NOAA U.S. Climate Normals 1991-2020 for Ft Smith Rgnl Airport, 4.2 miles SSE 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 Fort Smith

  1. January

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

  2. February

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

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

  3. March

    Start indoors: basil, 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, collard greens, dahlias, dill, figs, garden mums, 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

  4. April

    Start indoors: zinnias

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

  5. May

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

  6. June

    Plant or sow outdoors: bermudagrass, centipedegrass, st. augustinegrass, zoysiagrass

  7. July

    Plant for fall: brussels sprouts, peppers, potatoes, sweet corn, tomatoes

  8. August

    Plant for fall: bearded irises, beets, broccoli, brussels sprouts, cabbages, carrots, cauliflower, collard greens, cucumbers, green beans, lettuce, peas, peppers, radishes, snapdragons, spinach, sweet corn, swiss chard, turnips, zucchini

  9. September

    Plant for fall: azaleas, bearded irises, beets, broccoli, cabbages, carrots, cauliflower, clematis, coneflowers, crocuses, daffodils, daylilies, grass seed, hostas, hydrangeas, kale, kentucky bluegrass, lettuce, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, roses, saffron, snapdragons, spinach, swiss chard, tall fescue, tulips, turnips

  10. October

    Plant for fall: cabbages, cauliflower, crocuses, daffodils, daylilies, grass seed, hostas, hyacinths, kale, kentucky bluegrass, lilies, ornamental alliums, peonies, perennial ryegrass, radishes, saffron, spinach, tall fescue, tulips

  11. November

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

  12. December

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

Frost dates and zones by ZIP code in Fort Smith

All 6 of Fort Smith's main ZIP codes take their frost dates from Ft Smith Rgnl Airport, so the dates on this page apply across the city. Every one of them is in zone 8a.

ZIP codeZoneWeather stationTypical last frostTypical first frost
729018aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6
729038aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6
729048aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6
729088aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6
729168aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6
729238aFt Smith Rgnl Airport, 4.2 mi SSEMar 25Nov 6

Planting dates for popular crops in Fort Smith

PlantStart indoorsPlant or sow outdoorsFall planting
TomatoesFeb 11 to 25Apr 8 to 22Jul 24 to 31
Strawberries—Feb 11 to 25—
LettuceJan 28 to Feb 11Mar 18 to Apr 1Aug 7 to Sep 11
CilantroFeb 11 to 25Mar 25 to Apr 1—
BasilFeb 18 to Mar 4Apr 8 to 15—
Potatoes—Mar 5 to 12Jul 17 to 24
Garlic—Feb 11 to 25Nov 6 to 20
OnionsDec 3 to Jan 14Feb 25 to Mar 11—
CucumbersMar 11 to 25Apr 8 to 22Aug 7 to 21
PumpkinsMar 11 to 25Apr 8 to 22—
PeppersJan 21 to Feb 18Apr 8 to 22Jul 17 to Aug 14
Carrots—Mar 4 to 25Aug 14 to Sep 4
Sweet Potatoes—Apr 27 to May 4—
WatermelonsMar 4 to 18Apr 8 to 22—
Sweet Corn—Mar 25 to Apr 8Jul 31 to Aug 14
Green Beans—Apr 8 to 22Aug 14 to 21
ZucchiniMar 11 to 25Apr 8 to 22Aug 14 to 28
BroccoliJan 7 to 28Feb 25 to Mar 11Aug 21 to Sep 18
Peas—Feb 11 to 25Aug 14 to 28
SpinachFeb 11 to 18Mar 18 to Apr 1Aug 28 to Oct 2
Sunflowers—Mar 25 to Apr 15—
ZinniasApr 17 to 24May 15 to 29—
Tulips——Sep 25 to Nov 20
Daffodils——Sep 25 to Nov 6
Grass Seed—Feb 11 to 25Sep 25 to Oct 9

Nearby cities

Planting in ArkansasAbout zone 8aPrintable calendar for Fort Smith

Questions

When is the last frost in Fort Smith?

Around March 25 in a typical year, based on NOAA's 1991-2020 records for Ft Smith Rgnl Airport. There is still a 1 in 10 chance of frost after April 11.

What planting zone is Fort Smith in?

USDA hardiness zone 8a (2023 map). The zone tells you which perennials survive the winter; planting dates depend on frost dates instead.

When should I plant tomatoes in Fort Smith?

Start seeds indoors February 11 to 25 and set plants out April 8 to 22; the safest date to plant out is after April 11.

When is the first frost in Fort Smith?

Around November 6 in a typical year, and before October 23 about 1 year in 10.