When should I plant radishes in ZIP 53202?

In ZIP 53202, the main radishes target is around Apr 12, based on the representative Milwaukee frost station and USDA zone 6a.

When should I start radishes seeds indoors in 53202?

Radishes is usually direct-sown for ZIP 53202. Use the Apr 12 planting window instead of starting it indoors.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 53202 planting calendar

When to plant radishes in Milwaukee, WI - Zone 6a

Q: When is the first frost in Milwaukee?

Milwaukee (ZIP 53202) has an average first fall frost around Oct 10, leaving about 153 frost-free days.

In ZIP 53202, plant radishes around Apr 12; this uses the Milwaukee frost station, USDA zone 6a, and radishes timing rules.

Your Milwaukee calendar has a 153-day estimated frost-free season. This estimate uses the representative Milwaukee frost station, USDA zone 6a, and radishes timing rules.

Source: milwaukee-mitchell frost station, USDA zone 6a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 6a Milwaukee frost station University of Wisconsin Extension Updated 2026-06-28

Read the method

Answer first

When to start radishes seeds indoors in Milwaukee

In ZIP 53202, radishes is usually direct-sown around Apr 12 instead of started indoors.

Radishes is normally direct-sown in Milwaukee. Use around Apr 12 as the outdoor planting window for ZIP 53202.

Seed starting schedule

Radishes dates for Milwaukee, WI

Step	Date	How to use it
Direct Sow	April 12, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Milwaukee?

Milwaukee (ZIP 53202) has an average last spring frost around May 10.

First frost

When is the first frost in Milwaukee?

The average first fall frost is around Oct 10, giving about 153 frost-free days.

Season map

Radishes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Apr 12

Harvest

May 10

Frost watch

Sep 12

Reminder workflow

Every date has a next action

Direct sow radishesApr 12

Last frost windowMay 10

First radishes harvest windowMay 10

Last radishes sowing targetSep 12

Signal	Value	Why it matters
Last frost estimate	May 10, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 10, 2026	Fall planting counts backward from this date.
Season length	153 days	Longer seasons can support succession crops.
Spacing	1-2 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Milwaukee frost history and USDA zone 6a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of Wisconsin Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Radishes timing notes

Fast crop; harvest promptly before roots get woody. Radishes prefers full sun, 1-2 in spacing, and soil near 40 F+.

For fall, count backward from Oct 10. A conservative last sowing target is around Sep 12.