🍠 Can I Plant Radish in Milwaukee, WI?

2026 planting guide for Zone 5b · Last frost ~May 5 · Growing season ~158 days

✅ YES — Good time to plant for a fall harvest

Radish thrives in cool weather and can be planted now for a fall harvest. Sow seeds soon — they'll be ready around Aug 21–Aug 29, well before the average first frost around Nov 18.

Planting window: Jul 30 – Aug 13
Sow radish seeds directly now for a fall harvest. Expect to harvest around Aug 21.
Live result based on current forecast for Milwaukee, WI · Updates every 6 hours
USDA Zone
5b
Last Spring Frost
~May 5
First Fall Frost
October 10
Growing Season
~158 days
Ideal Temp for Radish
40–65°F
Frost Risk
✅ Tolerant

Growing Radish in Milwaukee

Milwaukee's Zone 5b climate on Lake Michigan's western shore means a short but intense growing season of about 155 days. The lake moderates spring and fall temperatures, but last frosts can stretch into early May. Warm-season crops need to be started indoors in late March and transplanted only after the frost risk passes. The reward is productive summers with excellent tomato and squash harvests.

In Milwaukee (last frost around May 5), radish can go out around March — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

Radish thrives between 40°F and 65°F. It tolerates temperatures as low as 32°F, making it a candidate for early spring planting before the last frost date. Expect 22–30 days from transplant to first harvest. One of the fastest vegetables. Spring or fall.

Frequently Asked Questions

When can I plant radish in Milwaukee, WI?

In Milwaukee (last frost around May 5), radish can go out around March — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

What is the USDA hardiness zone for Milwaukee?

Milwaukee, WI is in USDA Plant Hardiness Zone 5b. The last expected spring frost is around May 5, and the first fall frost arrives around October 10. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant radish outside in Milwaukee right now?

That depends on the current weather forecast. Radish needs temperatures above 32°F (ideally 40–65°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 radish in Milwaukee 2026?

Yes — Radish grows well in Milwaukee, WI. With a Zone 5b climate and a growing season of ~158 days, Milwaukee is well-suited for cool-season crops like radish. As a frost-tolerant crop, radish can even go out a few weeks before the last frost date.

Grow Radish in Other Cities

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