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Sioux City, IA Planting Calendar

The last spring frost in Sioux City usually comes around Apr 24 and the first fall frost around Oct 14, a growing season of about 173 days. Start tomatoes indoors Mar 13 – Mar 27 and plant them outside May 8 – May 22.

Last spring frostApr 24
First fall frostOct 14
Growing season173 days

When to plant vegetables in Sioux City

VegetableStart seeds indoorsPlant outsideFall crop
TomatoesMar 13 – Mar 27May 8 – May 22—
PeppersMar 6 – Mar 20May 15 – May 29—
EggplantMar 6 – Mar 20May 15 – May 29—
Cucumbers—May 8 – May 22—
Zucchini & summer squash—May 8 – May 22—
Pumpkins & winter squash—May 15 – May 29—
Green beans—May 8 – May 22Jul 22 – Aug 5
Sweet corn—May 8 – May 22—
BasilMar 27 – Apr 10May 8 – May 22—
LettuceFeb 27 – Mar 13Mar 27 – May 8Aug 19 – Sep 2
Spinach—Mar 13 – Apr 3Aug 19 – Sep 2
Peas—Mar 13 – Apr 3Aug 5 – Aug 19
Carrots—Mar 27 – May 1Jul 22 – Aug 5
Radishes—Mar 20 – May 8Sep 2 – Sep 16
BroccoliFeb 13 – Feb 27Mar 27 – Apr 10Jul 22 – Aug 5
KaleFeb 27 – Mar 13Mar 20 – Apr 3Aug 5 – Aug 19
Onions—Mar 27 – Apr 10—
Potatoes—Apr 3 – May 1—
Garlic——Sep 30 – Nov 4

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

Month-by-month planting in Sioux City

  1. JanuaryPlan, order seeds and prepare beds.
  2. FebruaryStart indoors: Lettuce, Broccoli, Kale
  3. MarchStart indoors: Tomatoes, Peppers, Eggplant, Basil, Lettuce, 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. JunePlan, order seeds and prepare beds.
  7. JulyPlant outside: Green beans, Carrots, Broccoli
  8. AugustPlant outside: Green beans, Lettuce, Spinach, Peas, Carrots, Broccoli, Kale
  9. SeptemberPlant outside: Lettuce, Spinach, 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 City?

The median last spring frost is Apr 24 and the median first fall frost is Oct 14, based on 2016–2025 weather data.

When should I plant tomatoes in Sioux City?

Start seeds indoors Mar 13 – Mar 27 and set plants outside May 8 – May 22, once nights stay above 50°F.

When should I plant a fall garden in Sioux City?

Sow or transplant cool-season crops 6 to 12 weeks before the first fall frost (around Oct 14): broccoli and carrots first, lettuce, spinach and radishes last.

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