When to Plant Bok Choy in Bay City, Michigan (48708)

Location

Bay City, Michigan

ZIP Code

48708

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Monday, March 23, 2026

Based on last frost Monday, April 20, 2026 · Zone 6a

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

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🌿 Plant Details

Scientific Name Brassica rapa subsp. chinensis

Days to Maturity 45 days

Mature Height 12-18"

Spread 12"

Type Leaf

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Partial Shade to Full Sun

💧

Water

Regular (consistent moisture)

↔️

Spacing

6" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Bok Choy in Bay City?

Get your seeds now so they're ready by Monday, March 23, 2026.

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🤝 Good Companions

BeetCeleryDillOnion

⚠️ Avoid Planting Near

StrawberryTomato

🤝

Full Companion Planting Guide for Bok Choy

See which plants help Bok Choy 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

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plants to bolt and seed pods to dry on the stalk before harvesting.

Processing

Thresh dried stalks, winnow to separate seeds.

Seed Viability

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

Pro Tip

Brassica rapa — crosses with turnip, napa cabbage, and Chinese cabbage. Isolate by 300 feet.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Bok Choy in Bay City, Michigan? +

In Bay City (Zone 6a), direct sow Bok Choy outdoors around Monday, March 23, 2026.

What is the last frost date for Bay City, Michigan? +

The average last spring frost date for Bay City, Michigan (ZIP 48708) is around Monday, April 20, 2026. This is based on NOAA climate normals for USDA Zone 6a.

How long does Bok Choy take to grow? +

Bok Choy typically matures in about 45 days from direct sowing. In Bay City, that means you can expect harvest around Monday, March 23, 2026 plus 45 days.

Should I start Bok Choy indoors or direct sow in Michigan? +

Bok Choy does best when direct sown outdoors. In Bay City, sow directly around Monday, March 23, 2026.

📚 More Bok Choy Planting Guides

🗺️

Bok Choy in Michigan

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6a Bok Choy Guide

All cities in your zone · Avg dates

→

Other Plants for Bay City

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Growing Bok Choy in Zone 6a

Bok Choy (Brassica rapa subsp. chinensis) is a popular garden vegetable. In Bay City, Michigan, which is in USDA Hardiness Zone 6a, you should direct sow seeds around Monday, March 23, 2026.

Your average last frost date is Monday, April 20, 2026. Bok Choy grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.