When to Plant Kohlrabi in Fortescue, New Jersey (08321)

Location

Fortescue, New Jersey

ZIP Code

08321

USDA Zone

Last Frost

Sunday, April 5, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, March 8, 2026

Transplant Outdoors

Sunday, March 22, 2026

Based on last frost Sunday, April 5, 2026 · Zone 7b

Pro tip: Start Kohlrabi seeds indoors 4 weeks before your last frost date, then transplant outdoors around Sunday, March 22, 2026.

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🌿 Plant Details

Scientific Name Brassica oleracea var. gongylodes

Days to Maturity 55 days

Mature Height 12-18"

Spread 8"

Type Bulb

Fruit Size Small-Medium (2-3 inch bulb)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (consistent moisture prevents cracking)

↔️

Spacing

6" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Kohlrabi in Fortescue?

Get your seeds now so they're ready by Sunday, March 8, 2026.

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🤝 Good Companions

BeetOnionCucumberHerb

⚠️ Avoid Planting Near

TomatoPepperStrawberry

🤝

Full Companion Planting Guide for Kohlrabi

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plants to bolt in year 2. Harvest seed pods just before they shatter.

Processing

Thresh dried seed stalks in a bag, separate seeds from chaff by winnowing.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Brassica oleracea — crosses with broccoli, cabbage, kale, and Brussels sprouts. Isolate by 1000 feet for purity.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Kohlrabi in Fortescue, New Jersey? +

In Fortescue (Zone 7b), start Kohlrabi seeds indoors around Sunday, March 8, 2026 and transplant outdoors around Sunday, March 22, 2026.

What is the last frost date for Fortescue, New Jersey? +

The average last spring frost date for Fortescue, New Jersey (ZIP 08321) is around Sunday, April 5, 2026. This is based on NOAA climate normals for USDA Zone 7b.

How long does Kohlrabi take to grow? +

Kohlrabi typically matures in about 55 days from transplanting. In Fortescue, that means you can expect harvest around Sunday, March 22, 2026 plus 55 days.

Should I start Kohlrabi indoors or direct sow in New Jersey? +

Kohlrabi should be started indoors 4 weeks before your last frost date. In Fortescue, that means starting around Sunday, March 8, 2026.

📚 More Kohlrabi Planting Guides

🗺️

Kohlrabi in New Jersey

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7b Kohlrabi Guide

All cities in your zone · Avg dates

→

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Growing Kohlrabi in Zone 7b

Kohlrabi (Brassica oleracea var. gongylodes) is a popular garden vegetable. In Fortescue, New Jersey, which is in USDA Hardiness Zone 7b, you should start seeds indoors around Sunday, March 8, 2026.

Your average last frost date is Sunday, April 5, 2026. Plan to transplant your Kohlrabi seedlings outdoors around Sunday, March 22, 2026, about -2 weeks after your last frost date.