When should I plant Sunflower in Zone 8b?

Start Sunflower seeds indoors around Mar 1. Transplant outdoors after Mar 29. Expect first harvest around Jun 2.

What is the last frost date for Zone 8b?

The average last spring frost date for Zone 8b is Mar 22. The first fall frost averages Nov 10, giving a 233-day growing season.

Can I grow Sunflower in Zone 8b?

Yes. Sunflower needs 90 days to harvest. Zone 8b has a 233-day growing season, which is sufficient. You can plant up to 10 successions.

🌻

🌻 Growing Sunflower in Zone 8b

Zone 8b has warm winters and an extended growing season — excellent for heat-loving crops like Sunflower. Last frost: Mar 22. First frost: Nov 10.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 1Nov 10

Season: Mar 22 – Nov 10 (233 days) · Succession: plant every 2 weeks (up to 10x)

Zone8b

Last FrostMar 22

First FrostNov 10

Season Length233 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sunflower in Zone 8b

Start Seeds Indoors: Mar 1

Start Sunflower seeds indoors around Mar 1 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Mar 29

Transplant Sunflower seedlings outdoors after Mar 29. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Jun 2

First harvest approximately Jun 2 (~65 days from transplant). Continue harvesting until first frost (Nov 10).

Companion Planting

✅ Cucumbers✅ Squash ✅ Corn✅ Beans

❌ Potatoes

Sunflower in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Plan Your Sunflower Garden

Track Sunflower from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Sunflower Growing Guide