When should I plant Sunflower in Zone 7b?

Start Sunflower seeds indoors around Mar 20. Transplant outdoors after Apr 17. Expect first harvest around Jun 21.

What is the last frost date for Zone 7b?

The average last spring frost date for Zone 7b is Apr 10. The first fall frost averages Nov 7, giving a 211-day growing season.

Can I grow Sunflower in Zone 7b?

Yes. Sunflower needs 90 days to harvest. Zone 7b has a 211-day growing season, which is sufficient. You can plant up to 8 successions.

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🌻 Growing Sunflower in Zone 7b

Zone 7b has mild winters and a long growing season — good conditions for Sunflower. Last frost: Apr 10. First frost: Nov 7.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 20Nov 7

Season: Apr 10 – Nov 7 (211 days) · Succession: plant every 2 weeks (up to 8x)

Zone7b

Last FrostApr 10

First FrostNov 7

Season Length211 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sunflower in Zone 7b

Start Seeds Indoors: Mar 20

Start Sunflower seeds indoors around Mar 20 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Apr 17

Transplant Sunflower seedlings outdoors after Apr 17. 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 21

First harvest approximately Jun 21 (~65 days from transplant). Continue harvesting until first frost (Nov 7).

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.

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