When To Plant Parsley Plants Outdoors

The best time to plant parsley plants outdoors is in the early spring, about two to four weeks before your last expected frost date.
 
This timing gives parsley plants a head start in cool, moist soil, which is exactly what they love.
 
If you’re asking when to plant parsley plants outdoors in your specific region, the answer hinges on your local climate and the fact that parsley is a biennial that thrives in cooler temperatures.
 
You can also plant parsley plants outdoors again in late summer for a fall harvest, which is a trick many gardeners use to extend their growing season.
 
In this post, we’ll dig into everything you need to know about when to plant parsley plants outdoors, how to nail the timing, and what conditions give you the best shot at a lush, flavorful patch.
 
Let’s dig in.
 

When to Plant Parsley Plants Outdoors: The Simple Rule

When to plant parsley plants outdoors boils down to a simple rule: wait until the soil is workable and the danger of hard frost has passed.
 
Parsley seeds actually germinate in soil as cool as 50°F (10°C), so you don’t need to wait for warm weather.
 
In most zones, this means planting parsley plants outdoors in early spring, roughly two to four weeks before the last frost, since they can handle a light frost without issue.
 
For gardeners in warmer climates (zones 8-10), you can also plant parsley plants outdoors in the fall, from September through November, to grow through the mild winter.
 
The key is to avoid the heat, because parsley plants will bolt, or go to seed, when temperatures consistently climb above 75°F (24°C).
 
So, when to plant parsley plants outdoors is really about catching those cool, mild windows in spring or fall.
 

1. Check Your Last Frost Date First

The single most reliable way to figure out when to plant parsley plants outdoors is to find your local last frost date.
 
Count back about two to four weeks from that date, and that’s your planting window.
 
For example, if your last frost is April 15th, you can plant parsley plants outdoors as early as late March or early April.
 
You can look up your specific frost dates using your zip code on a gardening extension website or a simple online frost date calculator.
 
This takes all the guesswork out of when to plant parsley plants outdoors in your yard.
 

2. Soil Temperature Matters More Than Air Temperature

When deciding when to plant parsley plants outdoors, always check the soil temperature, not just the air temperature.
 
Grab a soil thermometer and stick it about two inches deep in your garden bed.
 
If it reads at least 50°F (10°C), you’re good to go for planting parsley plants outdoors.
 
Cooler soil will just delay germination, and the seeds might even rot if it’s too wet and cold.
 
So, if you’re unsure about when to plant parsley plants outdoors, let the soil be your guide, it never lies.
 

3. Consider a Fall Planting Window

Another excellent answer to when to plant parsley plants outdoors is late summer, about 6 to 8 weeks before your first fall frost.
 
This fall planting gives you a second harvest that often tastes sweeter, because the cool nights concentrate the oils in the leaves.
 
In mild-winter areas, parsley planted in the fall will even survive the winter and come back strong in early spring.
 
So, when to plant parsley plants outdoors isn’t just a spring question, it’s also a fall opportunity.
 

How to Plant Parsley Plants Outdoors for Success

Once you’ve nailed when to plant parsley plants outdoors, the next step is getting them in the ground properly.
 
Parsley is a bit finicky with germination, so a little prep goes a long way.
 
Here’s how to set your parsley plants outdoors for a thriving season.
 

1. Soak Seeds Before Planting

Parsley seeds have a tough outer coat that can slow down germination for up to three weeks.
 
To speed things up, soak your seeds in warm water for 24 hours before you plant parsley plants outdoors.
 
This softens the coat and signals the seed that it’s time to wake up.
 
You’ll see faster and more uniform germination when you plant parsley plants outdoors with this simple trick.
 

2. Pick a Sunny or Partially Shaded Spot

When you plant parsley plants outdoors, choose a location that gets full sun in cooler climates.
 
But if you live somewhere hot, aim for a spot with afternoon shade to protect it from scorching.
 
Parsley is pretty forgiving, but it won’t thrive in deep shade, and it won’t handle blazing afternoon sun in summer either.
 
So, when you plant parsley plants outdoors, balance the light for the best leaf production.
 

3. Space Them Four to Six Inches Apart

Give your parsley plants outdoors room to breathe by spacing them about 4 to 6 inches apart in rows.
 
Crowding can lead to poor air circulation, which invites fungal diseases like powdery mildew.
 
Sow seeds about 1/4 inch deep and keep the soil consistently moist until you see sprouts.
 
Once your parsley plants outdoors are a few inches tall, you can thin them to the proper spacing.
 

Common Mistakes When Deciding When to Plant Parsley Plants Outdoors

Even veteran gardeners mess up the timing on when to plant parsley plants outdoors.
 
Avoid these common mistakes so you don’t lose your whole crop.
 

1. Planting Too Early in Soggy Soil

Just because you can plant parsley plants outdoors before the last frost doesn’t mean you should plant into mud.
 
If the soil is waterlogged from melting snow or heavy spring rains, wait a week or two.
 
Planting parsley plants outdoors in soggy soil will cause the seeds to rot before they ever germinate.
 
Always test by squeezing a handful of soil, it should crumble, not form a muddy ball.
 

2. Waiting Too Long in Hot Climates

If you live in a zone where summers get scorching, waiting too long to plant parsley plants outdoors is a death sentence.
 
By late May or June, the heat will stress your parsley, and it will bolt quickly, turning bitter and tough.
 
So, when to plant parsley plants outdoors in a hot climate is much earlier, like February or March, or better yet, plant in the fall for winter harvest.
 

3. Ignoring the Biennial Nature

Parsley is a biennial, meaning it lives for two years, but it only produces lush leaves in its first year.
 
In the second year, it focuses on flowering and setting seeds, which makes the leaves less flavorful.
 
If you’ve planted parsley plants outdoors and they’ve overwintered, don’t expect great leaves in year two.
 
Instead, treat it as a fresh annual and plant parsley plants outdoors every year for a steady supply.
 

So, When Is the Best Time to Plant Parsley Plants Outdoors?

The best time to plant parsley plants outdoors is in early spring, two to four weeks before your last frost.
 
You can also plant parsley plants outdoors again in late summer for a fall harvest, especially in milder climates.
 
Just remember, the exact timing for when to plant parsley plants outdoors depends on your soil temperature and local frost dates.
 
If you keep the soil cool and moist and avoid extreme heat, your parsley plants outdoors will reward you with a steady supply of fresh, vibrant leaves.
 
So, check that frost date, grab your seeds, and get planting parsley plants outdoors at the perfect time this season.
 
Happy gardening.