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🌻 Growing Sunflower in Zone 8a

Zone 8a has warm winters and an extended growing season — excellent for heat-loving crops like Sunflower. Last frost: Apr 5. First frost: Oct 28.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 15Oct 28

Season: Apr 5 – Oct 28 (206 days) · Succession: plant every 2 weeks (up to 8x)

Zone8a

Last FrostApr 5

First FrostOct 28

Season Length206 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sunflower in Zone 8a

Start Seeds Indoors: Mar 15

Start Sunflower seeds indoors around Mar 15 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Apr 12

Transplant Sunflower seedlings outdoors after Apr 12. 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 16

First harvest approximately Jun 16 (~65 days from transplant). Continue harvesting until first frost (Oct 28).

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

Frequently Asked Questions

When should I plant Sunflower in Zone 8a?

Start Sunflower seeds indoors around Mar 15. Transplant outdoors after Apr 12. Expect first harvest around Jun 16.

What is the last frost date for Zone 8a?

The average last spring frost date for Zone 8a is Apr 5. The first fall frost averages Oct 28, giving a 206-day growing season.

Can I grow Sunflower in Zone 8a?

Yes. Sunflower needs 90 days to harvest. Zone 8a has a 206-day growing season, which is sufficient. You can plant up to 8 successions.

What is the best month to plant Sunflower in Zone 8a?

The best time to start Sunflower in Zone 8a is Mar. Begin seeds indoors around Mar 15, then transplant outdoors after the last frost date of Apr 5.

What companion plants grow well with Sunflower?

Good companion plants for Sunflower include Cucumbers, Squash, Corn, Beans. Avoid planting Sunflower near Potatoes.

How long does Sunflower take to harvest?

Sunflower takes approximately 90 days from planting to harvest. In Zone 8a, expect your first harvest around Jun 16.

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