When To Plant Cilantro In Colorado

The best time to plant cilantro in Colorado is in early spring after the last frost date, or in late summer for a fall harvest.
 
Cilantro loves cool weather, and Colorado’s unpredictable climate means you need to time your planting just right.
 
If you plant cilantro in Colorado too late in spring, the heat will make it bolt and go to seed quickly.
 
In this post, we’ll explore when to plant cilantro in Colorado so you can enjoy fresh leaves all season long.
 
Let’s dig in.
 

When to Plant Cilantro in Colorado

When you’re figuring out when to plant cilantro in Colorado, the answer depends on your local frost dates and the season you’re targeting.
 
Cilantro thrives in temperatures between 50°F and 85°F, which makes spring and fall the ideal windows in most parts of Colorado.
 
Here’s how to break it down.
 

1. Plant in Early Spring After the Last Frost

The most common answer to when to plant cilantro in Colorado is right after your last spring frost.
 
Along the Front Range, that’s usually mid-to-late April or early May.
 
In higher elevations like the mountains, you might wait until late May or even early June.
 
Cilantro seeds germinate best when soil temperatures are between 55°F and 68°F.
 
If you plant cilantro in Colorado too early, a late frost can kill your seedlings.
 
If you plant too late, the summer heat will cause bolting before you get a good harvest.
 

2. Succession Plant Every 2-3 Weeks

Because cilantro bolts so quickly in Colorado’s warm summers, smart gardeners plant cilantro in Colorado in succession.
 
Sow a new batch every two to three weeks from early spring through early summer.
 
This ensures you always have fresh leaves ready to pick while older plants go to seed.
 
Those seeds, by the way, are coriander, so nothing goes to waste.
 

3. Plant Again in Late Summer for a Fall Crop

When to plant cilantro in Colorado for a fall harvest?
 
Aim for late July to mid-August, depending on your first fall frost date.
 
Cilantro needs about 45 to 70 days to mature, so count backward from your expected first frost.
 
In Colorado, the first frost often arrives in early to mid-October along the Front Range.
 
That means planting cilantro in Colorado in late July or early August gives you a solid fall crop.
 

4. Consider Your Colorado Microclimate

Colorado has wildly different growing zones, so when to plant cilantro in Colorado isn’t a one-size-fits-all answer.
 
In Denver and the plains, you can plant cilantro in Colorado earlier in spring and later in fall.
 
In mountain towns like Aspen or Vail, the growing season is shorter, so you may only get one good window.
 
If you’re in Grand Junction or the Western Slope, your warmer days mean you should lean toward early spring and fall planting.
 

Tips for Growing Cilantro in Colorado

Once you know when to plant cilantro in Colorado, a few extra tips will help you get the best results.
 

1. Choose Slow-Bolt Varieties

Varieties like ‘Calypso’ and ‘Santo’ are slower to bolt, which is a huge advantage in Colorado’s climate.
 
These give you more time to harvest before the heat takes over.
 

2. Provide Afternoon Shade

Colorado’s intense afternoon sun can stress cilantro, especially in summer.
 
Plant cilantro in Colorado in a spot that gets morning sun and afternoon shade.
 
This simple trick can extend your harvest by weeks.
 

3. Keep the Soil Consistently Moist

Cilantro likes moist but well-drained soil.
 
Dry soil stresses the plant and speeds up bolting, so water regularly but don’t let it sit in soggy conditions.
 

4. Mulch to Keep Roots Cool

A layer of mulch helps keep soil temperatures down, which is especially helpful when you plant cilantro in Colorado for a summer crop.
 
It also helps retain moisture during dry spells.
 

5. Harvest Often to Delay Bolting

The more you pick cilantro leaves, the longer the plant stays productive.
 
Pinch off flower stalks as soon as they appear to keep the leaves coming.
 
Once cilantro bolts, the leaves turn bitter, but the seeds are still useful.
 

Common Mistakes When Planting Cilantro in Colorado

Even with the right timing, a few mistakes can ruin your cilantro crop.
 

1. Planting Too Late in Spring

If you wait until June to plant cilantro in Colorado, the heat will likely cause bolting within weeks.
 
Stick to early spring or late summer for the best results.
 

2. Ignoring Frost Dates

Colorado’s frost dates vary by region, so check your local extension office or a trusted gardening app.
 
This is the single most important factor when deciding when to plant cilantro in Colorado.
 

3. Not Replanting for Fall

Many gardeners forget that cilantro is a cool-season herb and skip the fall planting window.
 
Planting cilantro in Colorado in late summer gives you a second chance at a great harvest.
 

4. Letting Plants Bolt Without Harvesting Seeds

If your cilantro does bolt, don’t toss it.
 
Collect the seeds and use them as coriander in your kitchen.
 

So, When to Plant Cilantro in Colorado?

The best time to plant cilantro in Colorado is in early spring after the last frost, or in late summer for a fall harvest.
 
Cool temperatures are key, and succession planting every few weeks keeps your supply steady.
 
With slow-bolt varieties, afternoon shade, and consistent moisture, you can enjoy fresh cilantro from spring through fall.
 
Now that you know when to plant cilantro in Colorado, it’s time to grab your seeds and get growing.