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Sioux Falls, SD Planting Calendar

The last spring frost in Sioux Falls usually comes around Apr 28 and the first fall frost around Oct 11, a growing season of about 166 days. Start tomatoes indoors Mar 17 – Mar 31 and plant them outside May 12 – May 26.

Last spring frostApr 28
First fall frostOct 11
Growing season166 days

When to plant vegetables in Sioux Falls

VegetableStart seeds indoorsPlant outsideFall crop
TomatoesMar 17 – Mar 31May 12 – May 26—
PeppersMar 10 – Mar 24May 19 – Jun 2—
EggplantMar 10 – Mar 24May 19 – Jun 2—
Cucumbers—May 12 – May 26—
Zucchini & summer squash—May 12 – May 26—
Pumpkins & winter squash—May 19 – Jun 2—
Green beans—May 12 – May 26Jul 19 – Aug 2
Sweet corn—May 12 – May 26—
BasilMar 31 – Apr 14May 12 – May 26—
LettuceMar 3 – Mar 17Mar 31 – May 12Aug 16 – Aug 30
Spinach—Mar 17 – Apr 7Aug 16 – Aug 30
Peas—Mar 17 – Apr 7Aug 2 – Aug 16
Carrots—Mar 31 – May 5Jul 19 – Aug 2
Radishes—Mar 24 – May 12Aug 30 – Sep 13
BroccoliFeb 17 – Mar 3Mar 31 – Apr 14Jul 19 – Aug 2
KaleMar 3 – Mar 17Mar 24 – Apr 7Aug 2 – Aug 16
Onions—Mar 31 – Apr 14—
Potatoes—Apr 7 – May 5—
Garlic——Sep 27 – Nov 1

Dates count from the median frost dates (2016–2025) for Sioux Falls. In a cold spring, wait a week; in a warm one you can go a week early.

Month-by-month planting in Sioux Falls

  1. JanuaryPlan, order seeds and prepare beds.
  2. FebruaryStart indoors: Broccoli
  3. MarchStart indoors: Tomatoes, Peppers, Eggplant, Basil, Lettuce, Broccoli, KalePlant outside: Lettuce, Spinach, Peas, Carrots, Radishes, Broccoli, Kale, Onions
  4. AprilStart indoors: BasilPlant outside: Lettuce, Spinach, Peas, Carrots, Radishes, Broccoli, Kale, Onions, Potatoes
  5. MayPlant outside: Tomatoes, Peppers, Eggplant, Cucumbers, Zucchini & summer squash, Pumpkins & winter squash, Green beans, Sweet corn, Basil, Lettuce, Carrots, Radishes, Potatoes
  6. JunePlant outside: Peppers, Eggplant, Pumpkins & winter squash
  7. JulyPlant outside: Green beans, Carrots, Broccoli
  8. AugustPlant outside: Green beans, Lettuce, Spinach, Peas, Carrots, Radishes, Broccoli, Kale
  9. SeptemberPlant outside: Radishes, Garlic
  10. OctoberPlant outside: Garlic
  11. NovemberPlant outside: Garlic
  12. DecemberPlan, order seeds and prepare beds.

Tools for this season

Seed starting kitTrays with humidity domes for starting seeds indoors.See options on AmazonLED grow lightKeeps indoor seedlings short and sturdy.See options on AmazonFrost clothCovers tender plants on a surprise frost night.See options on AmazonSoil thermometerCheck the soil at 4 inches before you spread anything.See options on Amazon

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Frequently asked questions

When is the last frost in Sioux Falls?

The median last spring frost is Apr 28 and the median first fall frost is Oct 11, based on 2016–2025 weather data.

When should I plant tomatoes in Sioux Falls?

Start seeds indoors Mar 17 – Mar 31 and set plants outside May 12 – May 26, once nights stay above 50°F.

When should I plant a fall garden in Sioux Falls?

Sow or transplant cool-season crops 6 to 12 weeks before the first fall frost (around Oct 11): broccoli and carrots first, lettuce, spinach and radishes last.

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