If you’re wondering what to plant in March in Zone 6, this guide will walk you through the best vegetables to grow outdoors and what to start indoors.
4
🌿 Introduction
March is when gardening season officially begins in Zone 6 — but it’s important to plant the right crops at the right time.
Zone 6 typically has its last frost between late March and mid-April, which means March is still considered early spring planting season.
That means:
- You can plant cold-hardy vegetables outdoors
- And start warm-season crops indoors
🌱 What You Can Plant Outdoors in March (Zone 6)
These crops can handle cool soil and light frost, making them perfect for early planting.
According to planting calendars, hardy vegetables like peas, spinach, carrots, and lettuce can go in the ground as soon as the soil can be worked.
✅ Direct Sow (Plant Outside)
Many of these crops germinate in cool soil (40–50°F) and thrive in early spring conditions.
👉 Example:
Beets can be planted in early spring once soil is workable and germinate best around 50°F soil temperature.
🌿 What to Start Indoors in March (Zone 6)
March is also the prime time to start seeds indoors for summer crops.
Most seeds should be started about 6 weeks before your last frost date.
🌱 Start Indoors
These plants need a longer growing season, so starting indoors gives them a head start.
🥔 Bonus: Crops You Can Plant Late March
As the soil warms slightly toward the end of the month:
- Potatoes (plant 2–4 weeks before last frost)
- Collards
- Mustard greens
🌡️ Soil Temperature Matters More Than Dates
One of the biggest beginner mistakes is planting too early.
Instead of focusing only on the calendar, pay attention to:
- Soil should not be frozen or soggy
- It should crumble easily (not stick together)
- Cool crops grow best between 40°F–60°F soil temps
🌼 Quick Planting Chart for March (Zone 6)
Outdoors
✔ Peas
✔ Spinach
✔ Lettuce
✔ Carrots
✔ Radishes
✔ Beets
Indoors
✔ Tomatoes
✔ Peppers
✔ Broccoli
✔ Cabbage
🚫 What NOT to Plant Yet
Avoid planting these outside in March:
- Tomatoes
- Peppers
- Cucumbers
- Squash
- Beans
These are warm-season crops and should wait until after your last frost.
🌱 Pro Tips for March Gardening
- Plant in raised beds for faster soil warming
- Use Row Cover to protect from frost
- Do succession planting every 2–3 weeks for continuous harvest
- Start small — even a few crops can produce a lot
🌿 Final Thoughts
March is the perfect time to kickstart your garden in Zone 6.
Start with cold-hardy vegetables outdoors and begin your summer crops indoors — and by late spring, your garden will be thriving.
👉 If you’re new to gardening, check out our guide on
How to Start a Backyard Garden for Beginners
👉 Looking for easy crops? Read:
10 Vegetables That Grow Easily in a Backyard Garden