LawnWeather

Seattle, WA Planting Calendar

The last spring frost in Seattle usually comes around Mar 12 and the first fall frost around Nov 15, a growing season of about 248 days. Start tomatoes indoors Jan 29 – Feb 12 and plant them outside Mar 26 – Apr 9.

Last spring frostMar 12
First fall frostNov 15
Growing season248 days

When to plant vegetables in Seattle

VegetableStart seeds indoorsPlant outsideFall crop
TomatoesJan 29 – Feb 12Mar 26 – Apr 9—
PeppersJan 22 – Feb 5Apr 2 – Apr 16—
EggplantJan 22 – Feb 5Apr 2 – Apr 16—
Cucumbers—Mar 26 – Apr 9—
Zucchini & summer squash—Mar 26 – Apr 9—
Pumpkins & winter squash—Apr 2 – Apr 16—
Green beans—Mar 26 – Apr 9Aug 23 – Sep 6
Sweet corn—Mar 26 – Apr 9—
BasilFeb 12 – Feb 26Mar 26 – Apr 9—
LettuceJan 15 – Jan 29Feb 12 – Mar 26Sep 20 – Oct 4
Spinach—Jan 29 – Feb 19Sep 20 – Oct 4
Peas—Jan 29 – Feb 19Sep 6 – Sep 20
Carrots—Feb 12 – Mar 19Aug 23 – Sep 6
Radishes—Feb 5 – Mar 26Oct 4 – Oct 18
BroccoliJan 1 – Jan 15Feb 12 – Feb 26Aug 23 – Sep 6
KaleJan 15 – Jan 29Feb 5 – Feb 19Sep 6 – Sep 20
Onions—Feb 12 – Feb 26—
Potatoes—Feb 19 – Mar 19—
Garlic——Nov 1 – Dec 6

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

Month-by-month planting in Seattle

  1. JanuaryStart indoors: Tomatoes, Peppers, Eggplant, Lettuce, Broccoli, KalePlant outside: Spinach, Peas
  2. FebruaryStart indoors: Tomatoes, Peppers, Eggplant, BasilPlant outside: Lettuce, Spinach, Peas, Carrots, Radishes, Broccoli, Kale, Onions, Potatoes
  3. MarchPlant outside: Tomatoes, Cucumbers, Zucchini & summer squash, Green beans, Sweet corn, Basil, Lettuce, Carrots, Radishes, Potatoes
  4. AprilPlant outside: Tomatoes, Peppers, Eggplant, Cucumbers, Zucchini & summer squash, Pumpkins & winter squash, Green beans, Sweet corn, Basil
  5. MayPlan, order seeds and prepare beds.
  6. JunePlan, order seeds and prepare beds.
  7. JulyPlan, order seeds and prepare beds.
  8. AugustPlant outside: Green beans, Carrots, Broccoli
  9. SeptemberPlant outside: Green beans, Lettuce, Spinach, Peas, Carrots, Broccoli, Kale
  10. OctoberPlant outside: Lettuce, Spinach, Radishes
  11. NovemberPlant outside: Garlic
  12. DecemberPlant outside: Garlic

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

We may earn a commission when you buy through these links, at no extra cost to you. How this works

Frequently asked questions

When is the last frost in Seattle?

The median last spring frost is Mar 12 and the median first fall frost is Nov 15, based on 2016–2025 weather data.

When should I plant tomatoes in Seattle?

Start seeds indoors Jan 29 – Feb 12 and set plants outside Mar 26 – Apr 9, once nights stay above 50°F.

When should I plant a fall garden in Seattle?

Sow or transplant cool-season crops 6 to 12 weeks before the first fall frost (around Nov 15): broccoli and carrots first, lettuce, spinach and radishes last.

More from Seattle