🌽 Can I Plant Corn in Madison, WI?

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

⏳ WAIT — Temps borderline — ideal is 65°F+ overnight — tight harvest window

Conditions are above the minimum safe threshold but still below ideal for Corn. Overnight lows of 65°F+ would give much better results. Note: timing is tight — harvest may run close to the average first fall frost around Nov 14. Consider a fast-maturing variety.

Planting window: Aug 13 – Aug 27 (tight — harvest near frost)
Wait a bit longer. Watch for overnight lows to reliably reach 65°F.
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 Corn
65–95°F
Frost Risk
⚠️ Sensitive

Growing Corn 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 corn outside around May — approximately 2 weeks after your last expected frost.

Corn thrives between 65°F and 95°F. It is frost-sensitive, meaning a single freeze at 32°F will damage or kill it — always wait until frost danger has fully passed. Expect 60–100 days from transplant to first harvest. Needs warm soil. Plant in blocks.

Frequently Asked Questions

When can I plant corn in Madison, WI?

In Madison (last frost around May 7), aim to direct sow or transplant corn outside around May — approximately 2 weeks after your last expected frost.

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 corn outside in Madison right now?

That depends on the current weather forecast. Corn needs temperatures above 55°F (ideally 65–95°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 corn in Madison 2026?

Yes — Corn grows well in Madison, WI. With a Zone 5a climate and a growing season of ~153 days, Madison is well-suited for warm-season crops like corn. Just wait until after the last frost (around May 7) before moving plants outside.

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