When To Plant Parsley In Seattle

When to plant parsley in Seattle comes down to timing your sowing around our famously mild, wet winters and cool springs.
 
The best time to plant parsley in Seattle is in early spring, usually from mid-March through April, as soon as the soil can be worked and temperatures stay consistently above 40°F.
 
You can also plant parsley in Seattle for a fall crop by sowing seeds in late July or early August, giving the plants time to mature before the first hard frosts arrive in November.
 
Because parsley is a biennial that thrives in cool weather, Seattle’s maritime climate is actually ideal for growing this flavorful herb almost year-round.
 
In this post, we’ll dig into the when to plant parsley in Seattle question, covering spring and fall planting windows, the best methods for starting seeds, and how to keep your parsley happy through our soggy winters.
 
Let’s get your Seattle parsley patch started right.
 

When to Plant Parsley in Seattle: The Short Answer

When to plant parsley in Seattle is all about working with our cool, damp seasons rather than fighting them.
 
Parsley prefers soil temperatures between 50°F and 70°F for germination, which aligns perfectly with Seattle’s spring and early fall conditions.
 
The moment you plant parsley in Seattle in mid-March, the seeds will slowly wake up as the soil warms, and you’ll see sprouts in two to four weeks.
 
If you’re planting parsley in Seattle in the fall, aim for late July so the plants establish strong roots before cooler October nights slow growth.
 
Let’s break down the two main opportunities to plant parsley in Seattle so you can harvest fresh leaves for months on end.
 

1. Spring Planting: March to April

The classic time to plant parsley in Seattle is between St. Patrick’s Day and the end of April.
 
Our soil is usually workable by then, and the risk of a hard freeze is low enough that parsley seeds can handle a little chill anyway.
 
You’ll want to plant parsley in Seattle after the last heavy rains have saturated the ground, because parsley doesn’t like waterlogged soil.
 
If you’re starting from seed outdoors, sow them about a quarter-inch deep and keep the soil consistently moist but not soggy.
 
A light mulch can help retain moisture and keep soil temperatures stable during those weird April days when we bounce from sun to showers.
 
For transplants, you can plant parsley in Seattle as early as mid-March, as long as you harden them off for a week before putting them in the ground.
 

2. Fall Planting: Late July to August

Yes, you can plant parsley in Seattle a second time for a fall and winter harvest.
 
Sow seeds in late July or early August, and the warm late-summer soil will trigger faster germination than spring.
 
When you plant parsley in Seattle during this window, the plants will mature by October, and you can keep harvesting leaves even through December with a little protection.
 
Seattle’s winters are mild enough that parsley often survives outdoors with just a frost cloth or a cold frame.
 
This second planting of parsley in Seattle is perfect for gardeners who want fresh herbs for soups and stews when everything else has died back.
 

Why Timing Matters for Planting Parsley in Seattle

Getting the timing right when you plant parsley in Seattle affects germination rates, plant vigor, and how long your harvest window lasts.
 
If you plant parsley in Seattle too early – say in February – cold, wet soil can rot the seeds before they sprout.
 
If you wait until May or June, the warmer temperatures and drier weather can cause parsley to bolt, meaning it goes to seed and the leaves turn bitter.
 
So the when to plant parsley in Seattle question really comes down to avoiding both extreme cold and extreme heat.
 
Our mild springs make March and April the sweet spot, while late summer offers a second chance for fall harvests.
 

1. Soil Temperature Is the Real Guide

Instead of relying only on the calendar, use a soil thermometer to know when to plant parsley in Seattle.
 
Parsley seeds germinate best when soil temps are between 50°F and 70°F, and Seattle typically reaches that range in mid-March.
 
Take a reading at a depth of two inches in the morning, and if it’s consistently above 50°F, you’re good to go.
 
This method works for both spring and fall planting of parsley in Seattle, because soil temps fluctuate more than the air temps we feel.
 

2. Consider Starting Indoors for a Head Start

If you’re impatient like many Seattle gardeners, you can start parsley indoors eight to ten weeks before your planned outdoor planting date.
 
This allows you to plant parsley in Seattle as transplants that are already several inches tall, cutting your wait for fresh leaves significantly.
 
Start seeds in small pots under a grow light or on a sunny windowsill in February, then transplant them outside in late March.
 
Indoor starts are especially helpful when you want to plant parsley in Seattle but the ground is too wet to work in early spring.
 

How to Plant Parsley in Seattle for Best Results

Once you know when to plant parsley in Seattle, the next step is doing it right.
 
Here are some practical tips that apply no matter which season you choose to plant parsley in Seattle.
 

1. Choose the Right Spot

Parsley loves full sun, but Seattle’s summer sun can be intense, so a spot with afternoon shade works well too.
 
Make sure the area drains well, because parsley roots will rot in standing water.
 
Raised beds or containers are great options for planting parsley in Seattle, especially if your native soil is heavy clay.
 

2. Improve Your Soil Before Planting Parsley in Seattle

Before you plant parsley in Seattle, amend the soil with compost or aged manure to boost nutrients and drainage.
 
Parsley isn’t a heavy feeder, but it does appreciate rich, loamy soil with a pH between 6.0 and 7.0.
 
Add a balanced organic fertilizer when planting, then side-dress with compost midway through the growing season.
 

3. Water Consistently After You Plant Parsley in Seattle

Parsley needs consistent moisture, especially during the first few weeks after you plant parsley in Seattle.
 
Water deeply once or twice a week, depending on rainfall, and always check the top inch of soil first.
 
If it feels dry to the touch, it’s time to water.
 
During Seattle’s dry July and August stretches, mulch around the plants to lock in moisture and keep soil temperatures down.
 

So, When to Plant Parsley in Seattle?

When to plant parsley in Seattle is best answered with two clear windows: early spring from mid-March to April, and late summer from late July to August.
 
You can plant parsley in Seattle in spring for a summer harvest, and you can plant parsley in Seattle in fall for a winter crop that keeps on giving.
 
The key is aligning your planting time with soil temperatures between 50°F and 70°F, plus avoiding the extremes of our wettest winter months and hottest summer days.
 
So, when to plant parsley in Seattle? Aim for March or August, and you’ll be rewarded with bushy, flavorful plants.
 
Get those seeds in the ground, and soon you’ll be snipping fresh parsley for everything from tabbouleh to garnishes.
 
Happy planting, and enjoy the bounty that comes from timing your parsley in Seattle just right.