Growing zinnias in zone 10
The more you cut, the more they bloom — harvest stems deep and plants branch furiously. Water at the base, not overhead, to keep powdery mildew off late-summer foliage.
Zone 10 covers south Florida, coastal Southern California, low desert — frost is rare — the calendar flips, with the main garden running fall through spring. Zone dates are medians: frost timing varies within a zone with elevation and terrain, so treat these windows as a solid default and refine them with your own city’s dates below.
Make it local
These windows use zone 10's typical frost dates (last frost ~Jan 25, first frost ~Dec 20). For windows computed from your frost dates, run the ZIP code frost lookup and open the planting calendar — it remembers your city. The seed starting scheduler turns the whole seed rack into one printable, date-sorted list.
Frequently asked questions
When do I plant zinnias in zone 10?
Transplant Feb 1 – Feb 8, counted from zone 10's typical last frost around Jan 25. It has no frost tolerance — a late frost after planting means covering it or replanting.
When should I start seeds indoors for zinnias in zone 10?
Sow indoors Dec 28 – Jan 4 — that's 4 to 3 weeks before the typical Jan 25 last frost, giving sturdy transplants exactly when the garden is ready for them.
Can I direct sow zinnias in zone 10?
Yes — direct sow Feb 1 – Feb 8. Transplants buy a head start, but direct-sown plants catch up quickly once soil warms.