🌿 Can I Plant Rosemary in Houston, TX?

2026 planting guide for Zone 9a · Last frost ~February 10 · Growing season ~304 days

✅ YES — Good temps, but watch for heat — highs near 92°F

Temperature conditions are suitable for Rosemary. Highs near 92°F are on the warm side — make sure plants have plenty of water.

Planting window: Jun 15 – Jun 29
Good to go — plant now while conditions are right.
Live result based on current forecast for Houston, TX · Updates every 6 hours
USDA Zone
9a
Last Spring Frost
~February 10
First Fall Frost
December 10
Growing Season
~304 days
Ideal Temp for Rosemary
50–85°F
Frost Risk
✅ Tolerant

Growing Rosemary in Houston

Houston's Zone 9a climate offers an extraordinarily long growing season — over 300 days. Summers are hot and humid, which suits tropical crops but can stress cool-season greens. Many Houston gardeners grow two full seasons: spring (Feb–June) and fall (Sept–Dec), skipping the most brutal summer heat for sensitive crops.

In Houston (last frost around February 10), aim to direct sow or transplant rosemary outside around February — approximately 0 weeks after your last expected frost. Starting seeds indoors 12 weeks before the last frost date gives you a significant head start.

Rosemary thrives between 50°F and 85°F. It tolerates temperatures as low as 28°F, making it a candidate for early spring planting before the last frost date. Expect 80–90 days from transplant to first harvest. Slow from seed. Best transplanted. Drought-tolerant once established.

Frequently Asked Questions

When can I plant rosemary in Houston, TX?

In Houston (last frost around February 10), aim to direct sow or transplant rosemary outside around February — approximately 0 weeks after your last expected frost. For best results, start seeds indoors 12 weeks before that — giving you strong transplants ready to go out at the right time.

What is the USDA hardiness zone for Houston?

Houston, TX is in USDA Plant Hardiness Zone 9a. The last expected spring frost is around February 10, and the first fall frost arrives around December 10. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant rosemary outside in Houston right now?

That depends on the current weather forecast. Rosemary needs temperatures above 28°F (ideally 50–85°F) to thrive. CanIPlant checks your real 7-day forecast and any active frost alerts to give you a live YES, NO, or WAIT answer — just enter your ZIP code.

Can I grow rosemary in Houston 2026?

Yes — Rosemary grows well in Houston, TX. With a Zone 9a climate and a growing season of ~304 days, Houston is well-suited for cool-season crops like rosemary. As a frost-tolerant crop, rosemary can even go out a few weeks before the last frost date.

Grow Rosemary in Other Cities

New York, NYLos Angeles, CAChicago, ILPhoenix, AZPhiladelphia, PASan Antonio, TXSan Diego, CADallas, TX

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