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🌻 Growing Sunflower in Zone 10a

Zone 10a has a year-round growing season. Sunflower can be planted almost any time with proper planning. Last frost: Feb 20. First frost: Dec 1.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 30Dec 1

Season: Feb 20 – Dec 1 (284 days) · Succession: plant every 2 weeks (up to 13x)

Zone10a

Last FrostFeb 20

First FrostDec 1

Season Length284 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sunflower in Zone 10a

Start Seeds Indoors: Jan 30

Start Sunflower seeds indoors around Jan 30 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Feb 27

Transplant Sunflower seedlings outdoors after Feb 27. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: May 3

First harvest approximately May 3 (~65 days from transplant). Continue harvesting until first frost (Dec 1).

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 10a?

Start Sunflower seeds indoors around Jan 30. Transplant outdoors after Feb 27. Expect first harvest around May 3.

What is the last frost date for Zone 10a?

The average last spring frost date for Zone 10a is Feb 20. The first fall frost averages Dec 1, giving a 284-day growing season.

Can I grow Sunflower in Zone 10a?

Yes. Sunflower needs 90 days to harvest. Zone 10a has a 284-day growing season, which is sufficient. You can plant up to 13 successions.

What is the best month to plant Sunflower in Zone 10a?

The best time to start Sunflower in Zone 10a is Jan. Begin seeds indoors around Jan 30, then transplant outdoors after the last frost date of Feb 20.

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 10a, expect your first harvest around May 3.

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