When to Plant Petunia in Carrington, North Dakota (58421)

Location

Carrington, North Dakota

ZIP Code

58421

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, March 6, 2026

Transplant Outdoors

Friday, May 29, 2026

Based on last frost Friday, May 15, 2026 · Zone 4a

Pro tip: Start Petunia seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, May 29, 2026.

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🌿 Plant Details

Scientific Name Petunia × hybrida

Days to Maturity 75 days

Mature Height 6-18"

Spread 18"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.13" deep

Seeds typically germinate in 7-14 days

Ready to Plant Petunia in Carrington?

Get your seeds now so they're ready by Friday, March 6, 2026.

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🤝 Good Companions

TomatoBasilMarigold

⚠️ Avoid Planting Near

Fennel

🤝

Full Companion Planting Guide for Petunia

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

⚠️ Many varieties are F1 hybrid — look for OP/heirloom types

When to Harvest Seed

Allow seed pods to form after flowers fade. Harvest when the small pod turns tan and begins to split.

Processing

Collect tiny seeds in a bowl when pod splits, dry 1 week before storing.

Seed Viability

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

Pro Tip

Most petunias are F1 hybrids — seedlings will not match the parent. Look for OP/heirloom varieties for reliable seed.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Petunia. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Petunia in Carrington, North Dakota? +

In Carrington (Zone 4a), start Petunia seeds indoors around Friday, March 6, 2026 and transplant outdoors around Friday, May 29, 2026.

What is the last frost date for Carrington, North Dakota? +

The average last spring frost date for Carrington, North Dakota (ZIP 58421) is around Friday, May 15, 2026. This is based on NOAA climate normals for USDA Zone 4a.

How long does Petunia take to grow? +

Petunia typically matures in about 75 days from transplanting. In Carrington, that means you can expect harvest around Friday, May 29, 2026 plus 75 days.

Should I start Petunia indoors or direct sow in North Dakota? +

Petunia should be started indoors 10 weeks before your last frost date. In Carrington, that means starting around Friday, March 6, 2026.

📚 More Petunia Planting Guides

🗺️

Petunia in North Dakota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4a Petunia Guide

All cities in your zone · Avg dates

→

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Growing Petunia in Zone 4a

Petunia (Petunia × hybrida) is a popular garden vegetable. In Carrington, North Dakota, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, March 6, 2026.

Your average last frost date is Friday, May 15, 2026. Plan to transplant your Petunia seedlings outdoors around Friday, May 29, 2026, about 2 weeks after your last frost date.