🌿 Can I Plant Rosemary in Madison, WI?

2026 planting guide for Zone 5a · Last frost ~May 7 · Growing season ~153 days

✅ YES — Conditions look good

Temperature conditions are suitable for Rosemary.

Planting window: Jul 30 – Aug 13
Good to go — plant now while conditions are right.
Live result based on current forecast for Madison, WI · Updates every 6 hours
USDA Zone
5a
Last Spring Frost
~May 7
First Fall Frost
October 7
Growing Season
~153 days
Ideal Temp for Rosemary
50–85°F
Frost Risk
✅ Tolerant

Growing Rosemary in Madison

Madison's Zone 5a climate between two lakes gives it roughly 152 frost-free days. The lakes Mendota and Monona slightly moderate temperatures, but late spring frosts remain a real risk into early May. The local university culture has fueled a strong gardening and sustainable agriculture community. Start warm-season crops indoors in late March, use row covers, and embrace cold-hardy varieties to make the most of Madison's short but rewarding season.

In Madison (last frost around May 7), aim to direct sow or transplant rosemary outside around May — 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 Madison, WI?

In Madison (last frost around May 7), aim to direct sow or transplant rosemary outside around May — 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 Madison?

Madison, WI is in USDA Plant Hardiness Zone 5a. The last expected spring frost is around May 7, and the first fall frost arrives around October 7. 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 Madison 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 Madison 2026?

Yes — Rosemary grows well in Madison, WI. With a Zone 5a climate and a growing season of ~153 days, Madison 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

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