What should I plant in August in Seattle, WA?

In August in Seattle, WA (zone 8b), you can plant Chives, Cilantro, Mint, Parsley, Beet, and more. These dates are based on local climate data for your area.

When do I plant Chives in Seattle, WA?

In Seattle, WA (zone 8b), Chives: start seeds indoors Jan 1 – Dec 31, transplant outdoors Jan 1 – Dec 31.

When do I plant Cilantro in Seattle, WA?

In Seattle, WA (zone 8b), Cilantro: direct sow Feb 15 – Sep 30.

When do I plant Mint in Seattle, WA?

In Seattle, WA (zone 8b), Mint: start seeds indoors Jan 1 – Dec 31, transplant outdoors Jan 1 – Dec 31.

What to Plant in August

Seattle, WA · Zone 8b

Last frost: Mar 8 Frost-free days: 257

Full year calendar for Seattle

Late summer is prime time for starting your fall garden. Sow cool-season crops indoors or direct sow fast-maturing varieties. The heat will ease soon.

August at a Glance

Indoor Transplant Direct Sow

1 5 10 15 20 25

Chives

Cilantro

Mint

Parsley

Beet

Broccoli

Cabbage

Carrot

Cauliflower

Garlic

Kale

Leek

Lettuce

Onion

Peas

Radish

Spinach

Strawberry

Swiss Chard

Turnip

Start Indoors 8

Start these seeds indoors under grow lights or on a sunny windowsill.

Chives

Jan 1 – Dec 31

9 per sq ft 60–90 days

Mint

Jan 1 – Dec 31

4 per sq ft 60–90 days

Strawberry

Jan 1 – Dec 31

4 per sq ft 60–90 days

Lettuce

Jan 17 – Aug 23

4 per sq ft 45–60 days

Swiss Chard

Jan 17 – Aug 8

4 per sq ft 50–60 days

Leek

Jul 9 – Aug 16

4 per sq ft 90–150 days

Onion

Aug 1–23

9 per sq ft 100–120 days

Spinach

Aug 1 – Sep 30

9 per sq ft 35–50 days

Transplant 11

Move these seedlings from indoors to your garden beds.

Chives

Jan 1 – Dec 31

9 per sq ft 60–90 days

Mint

Jan 1 – Dec 31

4 per sq ft 60–90 days

Strawberry

Jan 1 – Dec 31

4 per sq ft 60–90 days

Parsley

Feb 15 – Sep 8

4 per sq ft 70–90 days

Lettuce

Feb 15 – Sep 23

4 per sq ft 45–60 days

Onion

Feb 15 – Aug 16

9 per sq ft 100–120 days

Swiss Chard

Feb 15 – Sep 8

4 per sq ft 50–60 days

Broccoli

Mar 1 – Aug 16

1 per sq ft 60–100 days

Cabbage

Mar 1 – Aug 16

1 per sq ft 70–100 days

Cauliflower

Mar 1 – Aug 16

1 per sq ft 55–100 days

Kale

Mar 1 – Aug 31

1 per sq ft 50–65 days

Direct Sow 7

Plant these seeds directly into the soil outdoors.

Garlic

Jan 1 – Sep 8

9 per sq ft 180–240 days

Cilantro

Feb 15 – Sep 30

9 per sq ft 30–45 days

Beet

Feb 15 – Sep 15

9 per sq ft 50–70 days

Peas

Feb 15 – Sep 8

8 per sq ft 55–70 days

Turnip

Feb 15 – Oct 16

9 per sq ft 30–60 days

Carrot

Mar 9 – Aug 23

16 per sq ft 70–80 days

Radish

Mar 9 – Oct 8

16 per sq ft 22–30 days

August Gardening Tips

Start Lettuce, Spinach, Strawberry indoors now to give them a head start before transplanting outside.
Lettuce, Broccoli, Cabbage can be transplanted outside this month. Harden off seedlings over 5–7 days before planting out.
Direct sow Carrot, Peas, Garlic straight into the garden — no transplanting needed.
Count backwards from your first frost date to determine the last safe date for starting fall crops.