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Ann Arbor, MI Planting Calendar

The last spring frost in Ann Arbor usually comes around Apr 28 and the first fall frost around Oct 20, a growing season of about 175 days. Start tomatoes indoors Mar 17 – Mar 31 and plant them outside May 12 – May 26.

Last spring frostApr 28
First fall frostOct 20
Growing season175 days

When to plant vegetables in Ann Arbor

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 28 – Aug 11
Sweet corn—May 12 – May 26—
BasilMar 31 – Apr 14May 12 – May 26—
LettuceMar 3 – Mar 17Mar 31 – May 12Aug 25 – Sep 8
Spinach—Mar 17 – Apr 7Aug 25 – Sep 8
Peas—Mar 17 – Apr 7Aug 11 – Aug 25
Carrots—Mar 31 – May 5Jul 28 – Aug 11
Radishes—Mar 24 – May 12Sep 8 – Sep 22
BroccoliFeb 17 – Mar 3Mar 31 – Apr 14Jul 28 – Aug 11
KaleMar 3 – Mar 17Mar 24 – Apr 7Aug 11 – Aug 25
Onions—Mar 31 – Apr 14—
Potatoes—Apr 7 – May 5—
Garlic——Oct 6 – Nov 10

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

Month-by-month planting in Ann Arbor

  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, Broccoli, Kale
  9. SeptemberPlant outside: Lettuce, Spinach, Radishes
  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 Ann Arbor?

The median last spring frost is Apr 28 and the median first fall frost is Oct 20, based on 2016–2025 weather data.

When should I plant tomatoes in Ann Arbor?

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 Ann Arbor?

Sow or transplant cool-season crops 6 to 12 weeks before the first fall frost (around Oct 20): broccoli and carrots first, lettuce, spinach and radishes last.

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