When to Plant Cilantro in New Haven, Connecticut (06521)

Location

New Haven, Connecticut

ZIP Code

06521

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Friday, March 13, 2026

Based on last frost Friday, April 10, 2026 · Zone 7a

Pro tip: Sow Cilantro directly outdoors 4 weeks before your last frost date.

Add to Calendar (.ics)

🌿 Plant Details

Scientific Name Coriandrum sativum

Days to Maturity 45 days

Mature Height 12-24"

Spread 6"

Type Leaf

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Partial Shade to Full Sun

💧

Water

Regular (keep moist)

↔️

Spacing

6" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-10 days

Ready to Plant Cilantro in New Haven?

Get your seeds now so they're ready by Friday, March 13, 2026.

🛒 Buy on Amazon 🌿 True Leaf Market

* Affiliate links — we may earn a small commission at no extra cost to you.

🤝 Good Companions

AniseTomatoSpinachBean

⚠️ Avoid Planting Near

Fennel

🤝

Full Companion Planting Guide for Cilantro

See which plants help Cilantro thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

* Affiliate links — we may earn a small commission at no extra cost to you.

Common Cilantro Varieties

Popular cultivars to look for at your local nursery or seed supplier.

Santo

open-pollinated

Slow-bolting variety that stays leafy longer in warm weather than standard cilantro.

Calypso

open-pollinated

Highly bolt-resistant and high-yielding; ideal for warm climates with long growing seasons.

Leisure

open-pollinated

Large-leaved variety that bolts slowly and regrows well after cutting.

Vietnamese Coriander

species

Heat-loving substitute for true cilantro; peppery flavor, perennial in warm zones.

Common Cilantro Problems

What to watch for — and how to fix it before it spreads.

🐛

Pests

Aphids

Light green aphids cluster on stems and umbels, distorting flowers and reducing seed set.

Fix:

Spray with water or neem oil; tolerate light infestations as cilantro is short-lived anyway.

Caterpillars (Parsley Worm)

Striking green-and-black caterpillar that can strip a cilantro plant quickly.

Fix:

Relocate caterpillars to wild carrot (Queen Anne's Lace) — they become Black Swallowtail butterflies.

🍂

Diseases

Damping Off

Seedlings collapse at the soil line shortly after germination, caused by fungal pathogens in wet soil.

Fix:

Use sterile seed-starting mix; water from below; ensure excellent drainage.

Powdery Mildew

White coating on leaves; common in warm, dry weather with cool nights.

Fix:

Improve airflow; direct-sow in well-spaced rows; apply potassium bicarbonate spray.

💡

Common Mistakes

Sowing a single large batch

Cilantro bolts quickly in warm weather, leaving you with none after 4–6 weeks.

Fix:

Sow small amounts every 2–3 weeks from early spring through fall for a continuous harvest.

Growing in summer heat

Cilantro bolts immediately in temps above 80°F.

Fix:

Grow in spring and fall; in hot climates, grow in part shade or choose "slow bolt" varieties like Calypso.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let plants bolt fully. Harvest seed heads when they turn brown but before they shatter.

Processing

Cut seed heads into a bag and shake. Dry for 1 week before storing.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Cilantro seed (coriander) is also a culinary spice — you can save the same seeds you'd cook with.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Cilantro. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Cilantro in New Haven, Connecticut? +

In New Haven (Zone 7a), direct sow Cilantro outdoors around Friday, March 13, 2026.

What is the last frost date for New Haven, Connecticut? +

The average last spring frost date for New Haven, Connecticut (ZIP 06521) is around Friday, April 10, 2026. This is based on NOAA climate normals for USDA Zone 7a.

How long does Cilantro take to grow? +

Cilantro typically matures in about 45 days from direct sowing. In New Haven, that means you can expect harvest around Friday, March 13, 2026 plus 45 days.

Should I start Cilantro indoors or direct sow in Connecticut? +

Cilantro does best when direct sown outdoors. In New Haven, sow directly around Friday, March 13, 2026.

📚 More Cilantro Planting Guides

🗺️

Cilantro in Connecticut

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7a Cilantro Guide

All cities in your zone · Avg dates

→

Other Plants for New Haven

Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Leek Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Radish Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Cosmos Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Mizuna Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Celosia Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Cilantro in Zone 7a

Cilantro (Coriandrum sativum) is a popular garden vegetable. In New Haven, Connecticut, which is in USDA Hardiness Zone 7a, you should direct sow seeds around Friday, March 13, 2026.

Your average last frost date is Friday, April 10, 2026. Cilantro grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.