When To Plant Cilantro In Wisconsin

When to plant cilantro in Wisconsin depends on your local frost dates and the herb’s love for cool weather.
 
Cilantro thrives in the spring and fall because it bolts, or goes to seed, quickly in summer heat.
 
So when to plant cilantro in Wisconsin really comes down to timing your sowings around those mild windows.
 
In this post, we’ll cover the best planting windows, how to stagger your harvest, and tips to keep your cilantro happy in the Badger State.
 
Let’s dig into the details so you can enjoy fresh cilantro all season long.
 

When To Plant Cilantro In Wisconsin: The Simple Answer

The best time to plant cilantro in Wisconsin is about two to four weeks before your last expected spring frost.
 
For most of Wisconsin, that means sowing seeds in mid-April to early May, depending on your specific hardiness zone.
 
Cilantro can handle light frosts, so you don’t need to wait for the soil to warm up like you would for tomatoes or peppers.
 
You can also plant cilantro in late summer, around mid-August, for a fall harvest that lasts until hard freezes arrive.
 
Understanding when to plant cilantro in Wisconsin also means knowing your local frost dates, so let’s break that down by region.
 

1. Southern Wisconsin (Zones 5a–5b)

In southern Wisconsin, including Madison and Milwaukee, the last frost usually happens around late April to early May.
 
That means you can start planting cilantro in mid-April, right when the soil is workable.
 
For a fall crop, sow seeds again in early August to beat the first frost, which typically arrives in mid-October.
 
This gives you two solid windows for when to plant cilantro in Wisconsin’s southern counties.
 

2. Central Wisconsin (Zones 4a–4b)

Central areas like Wausau and Stevens Point see their last frost a bit later, usually in early to mid-May.
 
So when to plant cilantro in Wisconsin’s central region shifts to late April or the very first days of May.
 
Your fall planting window moves up to late July or early August because the first frost can hit by late September.
 
Keep an eye on those frost dates, and you’ll nail the timing every time.
 

3. Northern Wisconsin (Zones 3a–4a)

Up north, near Superior or Rhinelander, the last frost often doesn’t happen until mid-to-late May.
 
That’s why when to plant cilantro in Wisconsin’s northern tier means waiting until early May at the earliest.
 
Cilantro seeds will germinate in cool soil, even if a light frost sneaks in after planting.
 
For fall, sow in mid-July to early August, as the first frost can arrive as early as mid-September.
 

Why Timing Matters So Much For Cilantro In Wisconsin

Cilantro is a cool-season annual, meaning it prefers temperatures between 50°F and 70°F.
 
When the mercury climbs above 80°F, cilantro bolts, sending up flower stalks and turning the leaves bitter.
 
That’s why when to plant cilantro in Wisconsin is so critical, because our summers can get hot fast.
 
By planting early in spring or late in summer, you give cilantro the cool conditions it craves.
 
Let’s look at a few more nuances that affect your planting success.
 

Cilantro Bolting: The Heat Trigger

Cilantro bolts when day length increases and temperatures rise, and once it bolts, the leaves lose their punch.
 
So even if you plant at the perfect time, a sudden heat wave in June can still trigger early bolting.
 
To extend your harvest, consider planting in partial shade or using a shade cloth during the hottest weeks.
 
This doesn’t change when to plant cilantro in Wisconsin, but it does help you get more leaves before the plant flowers.
 

Succession Planting For A Continuous Supply

Instead of planting all your cilantro at once, try sowing a new batch every two to three weeks.
 
This works great for spring, when you can plant cilantro in Wisconsin from mid-April through late May.
 
Each new sowing will mature at a different time, so you always have fresh leaves ready to pick.
 
Stop succession planting by early June, because summer heat will make any new seedlings bolt too quickly.
 
Then, restart the process in late August for a fall harvest that lasts until frost.
 

How To Plant Cilantro In Wisconsin For Best Results

Once you know when to plant cilantro in Wisconsin, the actual planting is pretty straightforward.
 
Cilantro grows best in well-drained soil with a pH between 6.2 and 6.8.
 
Sow seeds about a quarter-inch deep and one to two inches apart, then thin seedlings to six inches apart.
 
Cilantro doesn’t like transplanting because of its taproot, so direct sowing is always the best option.
 
Let’s go over a few simple steps to get your cilantro off to a strong start.
 

1. Prepare Your Soil Before Planting

Loosen the soil to about six inches deep and mix in some compost to improve drainage and fertility.
 
Cilantro isn’t a heavy feeder, but rich soil helps produce lush, tender leaves.
 
Avoid heavy clay soils, as they can waterlog and cause root rot.
 
If you have clay, consider planting in raised beds or containers instead.
 

2. Water Consistently But Not Excessively

Cilantro likes even moisture, so water whenever the top inch of soil feels dry.
 
Too much water can cause damping off, a fungal disease that kills young seedlings.
 
Mulching around the plants helps retain moisture and keeps the soil cool.
 
This is extra helpful during the warm days of late spring when you’re wondering when to plant cilantro in Wisconsin next.
 

3. Harvest Leaves Early And Often

You can start picking cilantro leaves when the plants are about six inches tall.
 
Always harvest from the outside of the plant, leaving the inner leaves to keep growing.
 
This encourages more leaf production and delays bolting.
 
If you see flower stalks forming, pinch them off immediately to extend your harvest.
 

So, When To Plant Cilantro In Wisconsin?

The best time to plant cilantro in Wisconsin is two to four weeks before the last spring frost, and again in late summer for fall.
 
For most of the state, that means mid-April to early May for spring, and early August for fall.
 
Cilantro can handle cool weather and light frosts, so don’t be afraid to get those seeds in the ground early.
 
By pairing the right timing with succession planting and proper care, you’ll have fresh cilantro for months.
 
Whether you’re in Madison, Wausau, or Superior, now you know exactly when to plant cilantro in Wisconsin for a bountiful harvest.
 
Happy planting, and enjoy that fresh salsa with your own homegrown cilantro.