When To Start Cilantro Seeds

You should start cilantro seeds indoors about 4 to 6 weeks before your last expected frost date.
 
That gives your cilantro seeds enough time to germinate and grow into healthy seedlings ready for transplanting once the soil warms up.
 
If you’re direct sowing cilantro seeds outdoors, you can start them 2 to 3 weeks before your last frost date.
 
Cilantro is a cool-season herb, so timing matters more than almost anything else.
 
If you start cilantro seeds too late, the plants will bolt quickly in the summer heat and go straight to seed.
 
In this post, we’ll break down exactly when to start cilantro seeds, whether indoors or outdoors, and how to keep your crop productive all season.
 
Let’s dig in.
 

When to Start Cilantro Seeds Indoors

Starting cilantro seeds indoors gives you a head start on the growing season.
 
Here’s how to nail the timing.
 

1. Count Back 4 to 6 Weeks From Your Last Frost Date

The best time to start cilantro seeds indoors is 4 to 6 weeks before your last frost date.
 
Cilantro seeds germinate in about 7 to 10 days when kept warm and moist.
 
That leaves roughly 3 to 4 weeks for the seedlings to establish before they go outside.
 
If you start cilantro seeds any earlier, the plants may get leggy and stressed waiting for the weather to cooperate.
 

2. Use a Seed-Starting Mix and Shallow Trays

When you start cilantro seeds indoors, use a light seed-starting mix rather than heavy garden soil.
 
Cilantro seeds are actually two seeds inside one husk, so they germinate in clusters.
 
Sow them about a quarter inch deep and keep the soil consistently moist.
 
A shallow tray works better than deep pots because cilantro roots stay relatively compact early on.
 

3. Keep Soil Temperature Around 65 to 70°F

Cilantro seeds germinate best when the soil stays between 65 and 70°F.
 
A heat mat can speed things up, but once you see sprouts, remove it.
 
Too much heat will cause cilantro seedlings to stretch and weaken.
 

When to Start Cilantro Seeds Outdoors

If you’d rather skip the indoor setup, you can start cilantro seeds directly in the garden.
 
Here’s when and how.
 

1. Sow 2 to 3 Weeks Before Your Last Frost Date

You can start cilantro seeds outdoors 2 to 3 weeks before your last frost date.
 
Cilantro is frost-tolerant, so a light chill won’t kill your seedlings.
 
In fact, cool weather helps cilantro seeds germinate without bolting.
 

2. Succession Plant Every 2 to 3 Weeks

One of the smartest tricks is to start cilantro seeds in succession every 2 to 3 weeks.
 
This ensures you always have fresh leaves instead of one big harvest that bolts overnight.
 
Keep sowing cilantro seeds until early summer, then resume again in late summer for a fall crop.
 

3. Choose a Spot With Morning Sun and Afternoon Shade

When you start cilantro seeds outdoors, pick a location that gets morning sun and afternoon shade.
 
Cilantro grown in full afternoon sun will bolt faster than you can harvest it.
 
Partial shade keeps the soil cooler and extends your harvest window.
 

When to Start Cilantro Seeds in Hot Climates

Living somewhere with brutal summers changes the equation.
 
Here’s how to adapt.
 

1. Start Cilantro Seeds in Fall or Early Spring

In hot climates, the best time to start cilantro seeds is fall or very early spring.
 
Summer planting is almost pointless because the heat triggers bolting within weeks.
 
A fall crop started in September or October often outperforms anything planted in spring.
 

2. Grow Cilantro as a Cool-Season Annual

Treat cilantro like lettuce or spinach in hot regions.
 
Start cilantro seeds when temperatures are mild, and harvest before the first real heat wave.
 
You can also grow cilantro in containers that you move to shade during the hottest part of the day.
 

3. Shade Cloth Makes a Big Difference

If you must start cilantro seeds in warmer weather, use a 30 to 40 percent shade cloth.
 
This lowers soil temperature and slows bolting significantly.
 
Combine shade cloth with consistent watering, and you can stretch your cilantro harvest a few extra weeks.
 

Tips for Germinating Cilantro Seeds Faster

Cilantro seeds have a tough outer husk that slows germination.
 
Here’s how to speed things up.
 

1. Crack the Seed Coat Before Planting

Gently press each cilantro seed with the back of a spoon to split the husk.
 
This simple step can cut germination time in half.
 
Just don’t crush the seed inside, or it won’t sprout at all.
 

2. Soak Seeds Overnight

Soaking cilantro seeds in water for 12 to 24 hours softens the husk and speeds sprouting.
 
Pat them dry before sowing so they don’t clump together.
 

3. Keep the Soil Moist but Not Soggy

Cilantro seeds need consistent moisture to germinate.
 
A spray bottle works better than a watering can early on because it won’t displace the seeds.
 
Once seedlings emerge, water normally but never let the soil dry out completely.
 

So, When Should You Start Cilantro Seeds?

You should start cilantro seeds 4 to 6 weeks before your last frost date if you’re growing indoors.
 
If you’re sowing outdoors, start cilantro seeds 2 to 3 weeks before that same frost date.
 
In hot climates, shift your timing to fall or early spring so your plants never face scorching heat.
 
Succession planting every few weeks keeps the harvest coming instead of losing everything to bolting.
 
Whether you start cilantro seeds in trays on a windowsill or directly in the garden, timing is the difference between a bumper crop and a bitter disappointment.
 
Get the timing right, and you’ll have fresh cilantro for salsa, soups, and everything in between.