When to Plant Mustard in Saint Petersburg, Florida (33708)

Location

Saint Petersburg, Florida

ZIP Code

33708

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 4, 2025

Based on last frost Thursday, January 15, 2026 · Zone 10b

Pro tip: Sow Mustard directly outdoors 6 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Brassica juncea

Days to Maturity 56 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Mustard in Saint Petersburg?

Get your seeds now so they're ready by Thursday, December 4, 2025.

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🤝 Good Companions

CabbageCauliflowerRadishBrussel SproutTurnip

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Full Companion Planting Guide for Mustard

See which plants help Mustard 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

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Harvest seed pods just as they turn tan — before they shatter and seeds drop.

Processing

Cut stalks into a bag, thresh to release seeds from pods, winnow lightly.

Seed Viability

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

Pro Tip

Mustard crosses freely within the Brassica family — isolate by 300 feet from other mustard varieties.

Frequently Asked Questions

When should I plant Mustard in Saint Petersburg, Florida? +

In Saint Petersburg (Zone 10b), direct sow Mustard outdoors around Thursday, December 4, 2025.

What is the last frost date for Saint Petersburg, Florida? +

The average last spring frost date for Saint Petersburg, Florida (ZIP 33708) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.

How long does Mustard take to grow? +

Mustard typically matures in about 56 days from direct sowing. In Saint Petersburg, that means you can expect harvest around Thursday, December 4, 2025 plus 56 days.

Should I start Mustard indoors or direct sow in Florida? +

Mustard does best when direct sown outdoors. In Saint Petersburg, sow directly around Thursday, December 4, 2025.

📚 More Mustard Planting Guides

🗺️

Mustard in Florida

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10b Mustard Guide

All cities in your zone · Avg dates

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Other Plants for Saint Petersburg

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Growing Mustard in Zone 10b

Mustard (Brassica juncea) is a popular garden vegetable. In Saint Petersburg, Florida, which is in USDA Hardiness Zone 10b, you should direct sow seeds around Thursday, December 4, 2025.

Your average last frost date is Thursday, January 15, 2026. Mustard grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.