When To Germinate Cilantro

The best time to germinate cilantro is when the soil temperature is consistently between 55°F and 68°F, which usually means early spring or early fall in most growing zones.
 
Cilantro, also known as coriander, is a cool-season herb that thrives when temperatures are mild, so timing your germination around those conditions gives you the best chance of a healthy, productive plant.
 
If you live in a hot climate, germinating cilantro in late summer for a fall harvest or in late winter for an early spring crop works much better than trying to start it in the heat of summer.
 
The key is to avoid germinating cilantro when soil temps climb above 75°F, because at that point the seeds germinate poorly and the plants bolt almost immediately.
 
In this post, we’ll explore exactly when to germinate cilantro, how to time it right for your region, and a few tricks to get those seeds sprouting reliably.
 
Let’s dig in.
 

When to Germinate Cilantro for the Best Results

Cilantro germination timing depends mostly on temperature, and here’s why it matters so much:
 

1. Early Spring Is Prime Time for Germinating Cilantro

When to germinate cilantro in spring?
 
As soon as the soil can be worked and daytime temps hover around 60°F, you’re in the sweet spot.
 
Cilantro seeds germinate best when the soil is cool but not cold, so aim for a soil temperature of 55°F to 68°F.
 
If you sow too early while the ground is still frozen or waterlogged, the seeds may rot instead of sprout.
 
In most zones, that means starting cilantro seeds outdoors about two to three weeks before your last expected frost date.
 
You can also germinate cilantro indoors under grow lights a few weeks earlier if you want a head start.
 

2. Early Fall Is a Second Perfect Window to Germinate Cilantro

If your summers get scorching hot, fall is actually the best time to germinate cilantro in your garden.
 
Once the brutal heat breaks and evening temperatures drop into the 50s and 60s, cilantro seeds germinate quickly and the plants grow lush instead of bolting.
 
In warm climates like USDA zones 8 through 11, germinating cilantro in September or October gives you a long harvest through winter.
 
Just make sure you give the seedlings enough time to establish before the first hard freeze.
 

3. Avoid Germinating Cilantro in Mid-Summer Heat

Trying to germinate cilantro in July or August is usually a losing battle in most regions.
 
When soil temperatures rise above 75°F, cilantro seeds germinate unevenly, and any seedlings that do pop up will bolt within weeks.
 
Bolting means the plant shoots up a flower stalk and stops producing those tender leaves you actually want.
 
So if you’re wondering when to germinate cilantro in a hot climate, the answer is almost never during peak summer.
 
Wait for cooler weather, or start your cilantro seeds indoors in a climate-controlled space instead.
 

How to Germinate Cilantro Seeds Successfully

Once you’ve nailed down when to germinate cilantro, the next step is getting those stubborn seeds to actually sprout.
 

1. Soak the Seeds Before Planting

Cilantro seeds have a tough outer shell, so soaking them for 24 to 48 hours before planting softens that coating and speeds up germination.
 
Just drop the seeds in a bowl of room-temperature water and let them sit overnight.
 
This simple trick can cut germination time from three weeks down to about seven to ten days.
 

2. Plant at the Right Depth

Sow cilantro seeds about a quarter inch deep and keep the soil consistently moist but not soggy.
 
If you plant too deep, the seeds germinate poorly because the seedlings run out of energy before reaching the surface.
 
A light dusting of soil is all they need.
 

3. Keep the Soil Cool and Moist

Since cilantro germinates best in cool conditions, water gently and consider shading the seedbed if the sun is intense.
 
A layer of mulch or a shade cloth can keep soil temps down during those warm afternoons.
 
Consistency is everything here, so don’t let the soil dry out completely while you wait for sprouts.
 

4. Succession Plant Every Few Weeks

Because cilantro has a short window before it bolts, the smartest approach is to germinate cilantro seeds every two to three weeks during cool seasons.
 
That way you always have a fresh batch of leaves ready to harvest while older plants start flowering.
 
This succession strategy works whether you’re germinating cilantro in spring or fall.
 

So, When to Germinate Cilantro?

The best time to germinate cilantro is during cool weather, ideally in early spring or early fall when soil temperatures sit between 55°F and 68°F.
 
Avoid germinating cilantro in the heat of summer, because high temperatures cause poor germination and rapid bolting.
 
Soak your seeds first, plant them shallow, keep the soil moist, and succession sow every few weeks for a continuous harvest.
 
Get the timing right, and you’ll have more fresh cilantro than you know what to do with.