Wisconsin’s short, intense growing season means cilantro must go in the ground as soon as soil is workable. Finding the best time to plant cilantro in wisconsin can feel tricky, but with a few simple tips, you can enjoy fresh leaves all summer long. Cilantro loves cool weather, so timing is everything in the Badger State.
This guide walks you through exactly when to plant, how to prep your soil, and how to keep harvesting. No complicated charts—just straight talk for Wisconsin gardeners.
Best Time To Plant Cilantro In Wisconsin
Cilantro is a cool-season herb that bolts (goes to seed) fast in heat. In Wisconsin, you have two main planting windows: early spring and late summer. The best time to plant cilantro in wisconsin is as soon as the ground thaws and can be worked, usually between mid-April and early May. A second planting in late August gives you a fall harvest before frost.
Spring Planting Window
Wait until the soil temperature reaches about 50°F (10°C). In southern Wisconsin, that’s often mid-April. In northern areas, early May is more realistic. Check your local frost dates—cilantro can handle a light frost, but not a hard freeze.
- Southern WI: April 15–May 1
- Central WI: April 20–May 5
- Northern WI: May 1–May 15
Fall Planting Window
For a second crop, sow seeds in late August or early September. Cilantro grows well in cooler autumn temps and tastes sweeter after a light frost. Plant about 6–8 weeks before your first expected frost date.
Understanding Wisconsin’s Growing Zones
Wisconsin spans USDA hardiness zones 3b to 5b. That means your last spring frost can be as late as May 20 in the north, and as early as April 25 in the south. Always check your specific zone before planting.
Zone 3B (Northern WI)
Shortest growing season. Plant cilantro in late May or early June for spring harvest. For fall, sow seeds by mid-August.
Zone 4A–4b (Central WI)
Mid-range. Spring planting in early May works well. Fall planting by late August gives good results.
Zone 5A–5b (Southern WI)
Longest season. Plant as early as mid-April. Fall planting can stretch into early September.
How To Prepare Your Soil For Cilantro
Cilantro grows best in loose, well-draining soil with a pH between 6.2 and 6.8. Wisconsin’s heavy clay soil can be a problem—amend it with compost or aged manure before planting.
Step-By-Step Soil Prep
- Clear the area of weeds and rocks.
- Loosen soil to about 6 inches deep.
- Mix in 2–3 inches of organic compost.
- Rake smooth and water lightly.
If your soil is very clay-heavy, consider raised beds. Cilantro roots rot in soggy ground.
Planting Cilantro Seeds Directly
Cilantro doesn’t transplant well—it’s best to sow seeds directly in the garden. Seeds are actually small fruits called “schizocarps.” Each one contains two seeds, so you’ll get two plants from each seed you plant.
How To Sow Seeds
- Plant seeds 1/4 inch deep.
- Space seeds 2 inches apart in rows 12 inches apart.
- Cover lightly with soil and water gently.
- Seeds germinate in 7–10 days.
For a continuous harvest, sow a new batch every 2–3 weeks until late spring. Stop when summer heat arrives—cilantro bolts quickly above 85°F.
Watering And Care Tips
Cilantro needs consistent moisture, especially during germination. Water deeply once or twice a week, depending on rainfall. In Wisconsin’s humid summers, watch for powdery mildew—water at soil level, not on leaves.
Mulching Helps
A thin layer of straw or shredded leaves keeps soil cool and moist. This delays bolting by a week or two.
Thinning Seedlings
Once seedlings have 2–3 true leaves, thin them to 6 inches apart. Crowded plants bolt faster.
Harvesting Cilantro Leaves
Start harvesting when plants are 4–6 inches tall. Pick outer leaves first, leaving the center to grow. Regular harvesting encourages bushier growth and delays flowering.
How To Harvest
- Use clean scissors or pinch with fingers.
- Cut stems near the base, leaving 1–2 inches.
- Harvest in the morning for best flavor.
- Never take more than one-third of the plant at once.
Once flower stalks appear, leaves become bitter. At that point, let the plant go to seed—you can harvest coriander seeds for cooking.
Dealing With Bolting
Bolting is cilantro’s natural response to heat and long days. In Wisconsin, bolting usually starts in late June. You can slow it down with these tricks:
- Plant in partial shade (afternoon shade helps).
- Keep soil consistently moist.
- Harvest frequently.
- Use shade cloth during heat waves.
Once bolted, the plant focuses on seed production. Pull it and replant for fall harvest.
Companion Planting For Cilantro
Cilantro grows well with many vegetables. It attracts beneficial insects like ladybugs and lacewings, which eat aphids. Good neighbors include:
- Tomatoes (shade helps cilantro)
- Peppers
- Spinach
- Lettuce
- Dill
Avoid planting cilantro near fennel or beans—they compete for nutrients.
Growing Cilantro In Containers
If your garden soil is poor or you have limited space, try containers. Use a pot at least 8 inches deep with drainage holes. Fill with quality potting mix.
Container Tips
- Place in a spot that gets 4–6 hours of sun.
- Water when top inch of soil feels dry.
- Fertilize every 2 weeks with diluted liquid fertilizer.
- Bring indoors before first frost for extended harvest.
Container-grown cilantro bolts slightly faster, so succession planting is key.
Fall And Winter Cilantro
Wisconsin winters are too cold for outdoor cilantro, but you can grow it indoors. Use a sunny windowsill or grow lights. Keep temperatures around 60–70°F. Harvest as needed.
Overwintering Tips
- Use a 6-inch pot with drainage.
- Water sparingly—cilantro doesn’t like wet feet.
- Pinch off flowers to extend leaf production.
- Expect slower growth in low light.
Indoor cilantro rarely grows as lush as outdoor plants, but it’s better than nothing in January.
Common Pests And Diseases
In Wisconsin, cilantro faces a few pests. Aphids are the most common. Spray them off with a strong stream of water or use insecticidal soap. Slugs and snails can be a problem in wet springs—use beer traps or diatomaceous earth.
Disease Prevention
- Powdery mildew: Space plants for airflow, water at soil level.
- Root rot: Avoid overwatering, improve drainage.
- Leaf spot: Remove infected leaves, avoid overhead watering.
Most issues are preventable with proper spacing and watering.
Succession Planting Schedule For Wisconsin
To have cilantro all season, follow this schedule:
| Planting Date | Harvest Window |
|---|---|
| April 20 | June 1–June 20 |
| May 10 | June 15–July 5 |
| May 30 | July 1–July 20 |
| August 25 | October 1–October 20 |
| September 10 | October 15–November 1 |
Adjust dates based on your local frost dates. The fall harvest often tastes best because cool temps keep leaves tender.
Storing And Using Cilantro
Fresh cilantro keeps for a week in the fridge. Trim the stems, place in a glass of water, and cover with a plastic bag. Change water every 2 days.
Freezing Cilantro
- Wash and dry leaves thoroughly.
- Chop finely.
- Place in ice cube trays, cover with water or oil.
- Freeze, then transfer to freezer bags.
Frozen cilantro loses some texture but works well in soups and sauces.
Drying Cilantro
Drying is not recommended—cilantro loses most of its flavor. Freezing or using fresh is far better.
Why Timing Matters So Much
Cilantro is a short-lived plant. From seed to bolt, you have about 4–6 weeks of leaf harvest. If you plant too late in spring, the heat hits and you get flowers instead of leaves. Plant too early in fall, and warm soil causes quick bolting. The best time to plant cilantro in wisconsin is that sweet spot when soil is cool but not frozen.
Wisconsin’s climate gives you two distinct windows. Use both, and you can have cilantro from June through October. Miss the window, and you’ll be buying sad supermarket bunches all summer.
Frequently Asked Questions
Can I plant cilantro in Wisconsin in July?
July is too hot for direct sowing. If you must plant in July, choose a shady spot and keep soil very moist. Expect quick bolting.
What is the best time to plant cilantro in Wisconsin for fall harvest?
Late August to early September is ideal. Aim for 6–8 weeks before your first expected frost.
Should I soak cilantro seeds before planting?
Soaking seeds for 24–48 hours can speed germination. Not required, but helpful in cool soil.
How deep do I plant cilantro seeds?
Plant 1/4 inch deep. Too deep and they won’t sprout.
Can cilantro survive Wisconsin winter?
No, cilantro is an annual and dies with hard frost. Bring containers indoors for winter harvest.
Final Thoughts
Planting cilantro in Wisconsin is all about timing. Start in spring as soon as soil is workable, then again in late summer for fall. Keep soil moist, harvest often, and don’t let the heat catch you off guard. With a little planning, you’ll have fresh cilantro for salsas, curries, and garnishes all season long.
Remember, the best time to plant cilantro in wisconsin is early spring and late summer. Mark your calendar, prep your soil, and enjoy the freshest herbs from your own garden.