📍 Berkeley, CA · Zone 10a · Last frost Sunday, January 25, 2026
✏️ ChangeWhen to Plant Zinnia in Berkeley, California (94708)
Location
Berkeley, California
ZIP Code
94708
USDA Zone
10a
Last Frost
Sunday, January 25, 2026
📅 Your 2026 Planting Dates
Direct Sow Outdoors
Sunday, February 1, 2026
Based on last frost Sunday, January 25, 2026 · Zone 10a
Pro tip: Sow Zinnia directly outdoors 1 week after your last frost date — it needs warm soil.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Full Sun (6-8 hours)
💧
Water
Moderate (1 inch/week)
↔️
Spacing
12" apart
🌱
Planting Depth
0.25" deep
Seeds typically germinate in 5-10 days
Ready to Plant Zinnia in Berkeley?
Get your seeds now so they're ready by Sunday, February 1, 2026.
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🤝 Good Companions
Full Companion Planting Guide for Zinnia
See which plants help Zinnia thrive, which to keep away, and raised bed layout tips →
🛠️ Supplies You'll Need
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Common Zinnia Varieties
Popular cultivars to look for at your local nursery or seed supplier.
California Giant
Large 4–5 inch double flowers on tall stems; superb for cutting.
Benary's Giant
Top-rated cut flower series with strong stems and an enormous color range.
Envy
Unique lime-green zinnia that pairs beautifully with warm-toned flowers in arrangements.
Zahara
Disease-resistant series with smaller, mounded habit — excellent for beds and containers.
🌾 Seed Saving Guide
🟢 EasyWhen to Harvest Seed
Let flower heads dry completely on the plant — petals should be fully brown and papery.
Processing
Pull dried flower heads apart to find arrow-shaped seeds, dry 1 additional week.
Seed Viability
Up to 3 years when stored cool, dark, and dry.
Pro Tip
Zinnias cross easily — for pure color, save from just one variety or bag flowers before they open.
Raised Bed Planting Guides
A 4×8 bed fits 32 plants of Zinnia. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Zinnia in Berkeley, California? +
In Berkeley (Zone 10a), direct sow Zinnia outdoors around Sunday, February 1, 2026.
What is the last frost date for Berkeley, California? +
The average last spring frost date for Berkeley, California (ZIP 94708) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.
How long does Zinnia take to grow? +
Zinnia typically matures in about 60 days from direct sowing. In Berkeley, that means you can expect harvest around Sunday, February 1, 2026 plus 60 days.
Should I start Zinnia indoors or direct sow in California? +
Zinnia does best when direct sown outdoors. In Berkeley, sow directly around Sunday, February 1, 2026.
Other Plants for Berkeley
Growing Zinnia in Zone 10a
Zinnia (Zinnia elegans) is a popular garden vegetable. In Berkeley, California, which is in USDA Hardiness Zone 10a, you should direct sow seeds around Sunday, February 1, 2026.
Your average last frost date is Sunday, January 25, 2026. Zinnia grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.