When To Grow Cilantro Outside

The best time to grow cilantro outside is in the cool weather of spring or fall, since this herb bolts quickly in the heat of summer.
 
If you’ve been wondering when to grow cilantro outside so it thrives instead of turning bitter and leggy, the answer really comes down to timing and temperature.
 
Cilantro loves mild conditions, so the moment your region warms up past 75°F, the plant’s days are basically numbered.
 
In this post, we’ll walk through exactly when to grow cilantro outside, how to work around the heat, and a few handy tricks to keep your harvest going strong.
 
Let’s dig in.
 

When to Grow Cilantro Outside

The short answer is simple: grow cilantro outside in early spring and again in late summer to early fall.
 
That’s when the weather cooperates and the plant gives you tender, flavorful leaves instead of bolting.
 
Here are the key timing windows and factors to keep in mind.
 

1. Early Spring for a First Crop

The best time to grow cilantro outside starts in early spring, about two to three weeks before your last expected frost.
 
Cilantro is a cool-season herb, so it actually tolerates a light frost better than it tolerates heat.
 
As soon as the soil can be worked and the danger of a hard freeze has passed, you can direct sow your seeds outdoors.
 
If you grow cilantro outside too late in spring, those first warm days will send the plant straight into flowering.
 

2. Late Summer to Early Fall

Once the blazing heat of midsummer fades, you get a second chance to grow cilantro outside.
 
Aim to plant about six to eight weeks before your first fall frost.
 
The cooler days and nights of autumn are ideal, and your cilantro will grow cilantro leaves that stay tender far longer than a summer planting ever would.
 
In mild climates, you can even grow cilantro outside right through winter with a little protection.
 

3. Watch Your Local Climate

Knowing when to grow cilantro outside depends a lot on where you live.
 
In cooler northern regions, spring plantings last well into early summer.
 
In hot southern zones, you’ll have better luck growing cilantro outside in fall, winter, and early spring rather than in summer.
 
The key is to dodge the heat, because cilantro simply refuses to behave once temperatures climb.
 

Why Timing Matters When You Grow Cilantro Outside

Cilantro is a cool-weather herb, and that single fact explains almost everything about when to grow it.
 
Here’s why getting the timing right makes such a difference.
 

1. Heat Triggers Bolting

When you grow cilantro outside in hot weather, the plant panics and bolts.
 
Bolting means it shoots up a tall stem, flowers, and sets seed, which is great if you want coriander but terrible if you want leaves.
 
Once bolting starts, the leaves turn bitter and the harvest is basically over.
 

2. Cilantro Germinates Best in Cool Soil

The seeds of cilantro sprout most reliably when the soil is between 55°F and 70°F.
 
If you try to grow cilantro outside in soil that’s already hot, germination will be spotty and slow.
 
That’s another reason spring and fall are the sweet spots.
 

3. Longer Days Push It to Flower

Cilantro reacts to lengthening daylight, and the long days of summer tell it to reproduce fast.
 
So even if the temperature is tolerable, growing cilantro outside in midsummer often ends in flowers rather than foliage.
 

Tips to Grow Cilantro Outside Successfully

Timing is the big one, but a few smart habits will help you grow cilantro outside like a pro.
 
Here’s what actually works.
 

1. Sow Seeds Every Few Weeks

Since cilantro finishes fast, succession planting is your best friend.
 
Instead of one big planting, sow a small patch every two to three weeks when you grow cilantro outside.
 
That way, when one batch bolts, the next is ready to take over.
 

2. Give It Partial Shade in Warm Weather

If you must grow cilantro outside as things warm up, plant it where it gets afternoon shade.
 
A little relief from the harsh midday sun can delay bolting by a week or two.
 

3. Keep the Soil Consistently Moist

Dry soil stresses cilantro and speeds up bolting.
 
Water regularly so the ground stays evenly moist but never soggy.
 
Mulch helps hold that moisture in place when you grow cilantro outside.
 

4. Harvest Often and Early

The more you snip, the more leaves the plant produces before it decides to flower.
 
Start harvesting outer leaves as soon as the plant is a few inches tall.
 

5. Choose Slow-Bolt Varieties

Some cultivars are bred to resist bolting, which buys you extra time.
 
Look for names like ‘Slow Bolt’ or ‘Calypso’ if you plan to grow cilantro outside in a warmer climate.
 

So, When to Grow Cilantro Outside?

You should grow cilantro outside in early spring and again in late summer to early fall, avoiding the heat of summer.
 
Those cool windows are when cilantro grows best, tastes best, and lasts longest.
 
By timing your plantings around the weather, succession sowing, and choosing slow-bolt types, you can enjoy fresh cilantro for months.
 
Hope this post has helped you figure out exactly when to grow cilantro outside so your herb garden stays productive and delicious.