When To Start Cilantro Seeds

The best time to start cilantro seeds depends on your goal, but generally you should start cilantro seeds outdoors in early spring or fall, or indoors about 4 to 6 weeks before your last frost date.
 
Cilantro is a cool-season herb, so when you start cilantro seeds matters a lot more than most gardeners realize.
 
If you start cilantro seeds at the wrong time, the plants bolt, meaning they shoot up a flower stalk and stop producing tasty leaves.
 
So if you’ve been wondering when to start cilantro seeds for a steady harvest, the answer is all about timing and temperature.
 
In this post, we’ll look at when to start cilantro seeds indoors and outdoors, how to stagger plantings so you always have fresh leaves, and the mistakes to avoid.
 
Let’s dig in.
 

When to Start Cilantro Seeds for the Best Harvest

 
Knowing when to start cilantro seeds is the difference between a lush, leafy crop and a bitter, bolted mess.
 
Here’s when to start cilantro seeds based on how you plan to grow it:
 

1. Start Cilantro Seeds Outdoors in Early Spring

 
You can start cilantro seeds outdoors as soon as the soil can be worked in spring.
 
Cilantro seeds germinate best when soil temperatures are between 55°F and 68°F (13°C to 20°C).
 
In most regions, that means you start cilantro seeds about 2 to 3 weeks before your last expected frost date.
 
This is the classic window when to start cilantro seeds directly in the garden, since cilantro doesn’t transplant well.
 

2. Start Cilantro Seeds in Late Summer for a Fall Crop

 
If you live in a hot climate, your best bet is to start cilantro seeds in late summer or early fall.
 
That’s because cilantro thrives in cooler weather and struggles when temperatures climb above 75°F.
 
So when to start cilantro seeds in hot regions? Aim for late August to early September, once the worst of the summer heat has passed.
 
This fall planting gives you a second chance at a long, productive cilantro harvest.
 

3. Start Cilantro Seeds Indoors Before Transplanting

 
You can start cilantro seeds indoors about 4 to 6 weeks before your last frost date.
 
Use seed-starting trays or small pots with a light potting mix, and keep the soil consistently moist.
 
Just remember that cilantro has a taproot and dislikes being disturbed, so if you start cilantro seeds indoors, use biodegradable pots you can plant directly into the ground.
 
That way, when you start cilantro seeds inside, you avoid transplant shock.
 

How to Stagger When You Start Cilantro Seeds

 
One of the smartest tricks with cilantro is to start cilantro seeds in succession, not all at once.
 
Because cilantro bolts so quickly, a single planting only gives you a few weeks of leaves.
 
So here’s how to time it right:
 

1. Sow New Seeds Every 2 to 3 Weeks

 
When you start cilantro seeds every 2 to 3 weeks through spring and again in fall, you get a continuous supply.
 
Each new batch replaces the one that’s starting to flower.
 
This is the real secret to enjoying cilantro all season long.
 

2. Adjust for Your Climate Zone

 
In cooler zones, you can start cilantro seeds from early spring right through early summer.
 
In hotter zones, focus on starting cilantro seeds in early spring and again in fall.
 
Pay attention to your local temperatures, because when to start cilantro seeds always comes down to heat.
 

3. Use Shade to Extend the Season

 
If you start cilantro seeds in a spot that gets afternoon shade, the plants last longer before bolting.
 
That means you can start cilantro seeds a little later in spring and still get a decent harvest.
 
Shade is your friend when you start cilantro seeds in warmer months.
 

Common Mistakes When You Start Cilantro Seeds

 
Even when you know when to start cilantro seeds, a few missteps can ruin your crop.
 
Here’s what to avoid:
 

1. Starting Too Late in Spring

 
If you wait until the weather is hot to start cilantro seeds, the plants bolt almost immediately.
 
So when to start cilantro seeds? Earlier than you think, while the soil is still cool.
 

2. Letting the Soil Dry Out

 
Cilantro seeds need consistent moisture to germinate.
 
When you start cilantro seeds, keep the top inch of soil damp until seedlings appear.
 

3. Transplanting at the Wrong Time

 
If you start cilantro seeds indoors, transplant them while they’re still young.
 
Waiting too long stresses the taproot and slows growth.
 
This is why many gardeners simply start cilantro seeds directly where they’ll grow.
 

So, When to Start Cilantro Seeds?

 
When to start cilantro seeds comes down to cool weather, good timing, and a little planning.
 
Start cilantro seeds outdoors in early spring or fall, or indoors 4 to 6 weeks before your last frost date.
 
Stagger your plantings every few weeks, avoid the heat, and keep the soil moist.
 
Do that, and you’ll always have fresh cilantro ready to pick.