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The best time to plant parsley is in the cool weather of early spring, about two to four weeks before your last expected frost date.
This timing is perfect because parsley thrives in cooler soil and air temperatures, which encourages strong root development before the summer heat arrives.
If you live in a region with mild winters, you can also plant parsley in the late summer or early fall for a second harvest in the cooler months.
Knowing when to plant parsley really comes down to understanding your local climate and the plant’s natural preference for cooler conditions.
In this post, we’ll break down the exact timing for planting parsley in different seasons, how soil temperature affects success, and tips for getting the best germination rates.
Let’s dig into the details so you can time your parsley planting perfectly.
When to Plant Parsley for the Best Results
The ideal time to plant parsley is when the soil temperature is between 50°F and 70°F (10°C to 21°C).
This temperature range signals to the seeds that it’s safe to germinate, and it’s the sweet spot for healthy growth.
If you plant parsley too early, when the ground is still frozen or waterlogged, the seeds may rot before they sprout.
On the flip side, if you wait too long and the soil warms up past 80°F (27°C), parsley seeds often go dormant and refuse to germinate.
So the best time to plant parsley aligns with that moderate window, which for most gardeners means early spring.
Let’s look at specific scenarios for different climates so you know exactly when to plant parsley in your garden.
Planting Parsley in Early Spring
For most gardeners in temperate zones, early spring is the primary answer for when to plant parsley.
You can sow seeds directly outdoors as soon as the soil is workable in spring, even if there’s still a chance of a light frost.
Parsley is surprisingly frost-tolerant once it’s established, so a light chill won’t harm young seedlings.
Aim to plant parsley about two to four weeks before your area’s average last frost date, as this gives the seeds enough cool weather to germinate slowly and steadily.
If you’re eager to get a head start, you can also start parsley seeds indoors six to eight weeks before that last frost date.
Then, you’ll transplant the seedlings outdoors when they have a few true leaves, which is a reliable way to plant parsley earlier in the season.
Planting Parsley in Late Summer or Fall
If you missed the spring window, you can still plant parsley in late summer, about eight to ten weeks before your first expected fall frost.
This timing is perfect for a fall harvest because the cooler autumn temperatures mimic spring conditions.
When you plant parsley in late August or early September, the seeds will germinate in the warm soil, and the young plants will mature as temperatures drop.
In mild winter climates (USDA zones 8 and warmer), you can even plant parsley in late fall for a winter harvest.
So if you’re wondering when to plant parsley for a continuous supply, you can actually do two plantings: one in early spring and one in late summer.
Key Factors That Influence When to Plant Parsley
While the calendar dates are helpful, several environmental factors can shift your exact planting window.
Paying attention to these can make the difference between a slow, frustrating start and a lush, productive parsley patch.
Soil Temperature Matters More Than Air Temperature
When deciding when to plant parsley, always check the soil temperature rather than just the air temperature.
Use a soil thermometer to measure the ground’s warmth at a depth of about two inches.
Parsley seeds will germinate slowly at 50°F (10°C), but they prefer warmer soil around 65°F (18°C) for faster, more uniform sprouting.
If the soil is too cold, the seeds can sit dormant for weeks, and they may be more susceptible to fungal diseases.
That’s why the best time to plant parsley is often a few weeks after the last hard frost, once the ground has had a chance to warm up a bit.
Your Hardiness Zone Determines Your Date
Your USDA hardiness zone is a great guide for when to plant parsley in your specific location.
For example, in zones 5 and 6, you typically plant parsley in late March or early April, about two to four weeks before the last frost.
In warmer zones 8 and 9, you can plant parsley as early as February or March, and again in September for a fall crop.
In colder zones 3 and 4, you’ll likely need to wait until mid to late April or even early May before the soil is workable.
Checking a simple zone map for your area will give you a much clearer idea of when to plant parsley than a generic date.
Day Length and Sunlight Exposure
Parsley prefers full sun, which means at least six hours of direct sunlight each day.
When you plant parsley in early spring, the days are shorter and the sun is less intense, which is actually great for germination.
But as summer approaches with longer days and intense heat, parsley can bolt, meaning it goes to seed and the leaves become bitter.
That’s why planting parsley in early spring or late summer is so smart, because it lets the plant mature during mild day lengths.
If you plant parsley in mid-summer’s intense heat, you’ll struggle to get germination, and the plants will likely stress out.
Tips For Success When You Plant Parsley
Once you know when to plant parsley, you also need to know how to give it the best start possible.
Parsley seeds are notorious for being slow to germinate, sometimes taking up to three weeks, so patience is key.
Soak Your Seeds Before Planting
To speed up germination, soak your parsley seeds in warm water for about 24 hours before you plant parsley seeds in the ground.
This softens the seed coat and signals to the embryo that it’s time to wake up, which can cut germination time nearly in half.
After soaking, plant the seeds about a quarter-inch deep in well-draining soil.
Keep the soil consistently moist, but never soggy, during the entire germination period.
Use Shade Cloth for Summer Planting
If you’re planting parsley in late summer when the soil is still warm, consider providing some afternoon shade.
A light shade cloth can keep the soil temperature from climbing too high, which prevents the seeds from going dormant.
This simple trick makes late summer a viable time to plant parsley even in warmer regions.
Once the seedlings emerge, you can remove the shade cloth and let them enjoy the cooler autumn sun.
So, When to Plant Parsley?
The best time to plant parsley is in the early spring, two to four weeks before your last frost date, when the soil temperature is between 50°F and 70°F.
You can also plant parsley in late summer for a successful fall harvest, especially in cooler climates or with a bit of afternoon shade.
So when you’re planning your garden, remember that parsley loves the cool, mild days of spring and fall, and it strongly dislikes the heat of summer.
Now that you know exactly when to plant parsley, you can confidently sow your seeds and enjoy fresh, flavorful leaves all season long.
Happy gardening, and may your parsley be plentiful and vibrant!