GrowZone

Crop by USDA zone

When to plant radishes in zone 6a

In USDA zone 6a, plant radishes around Apr 7, after the representative last frost near May 5.

This page summarizes the supported ZIPs in zone 6a. Your exact city can move earlier or later, so use the ZIP lookup for the frost-station-specific answer.

Get exact radishes dates by ZIP code.

Seed starting schedule

Radishes dates for Denver, CO

StepDateHow to use it
Direct SowApril 7, 2026Sow seed outside when the crop and soil can handle the window.
Milwaukee, WI · Zone 6a Radishes Apr 12 Open ZIP-specific answer · last frost May 10 Chicago, IL · Zone 6a Radishes Mar 28 Open ZIP-specific answer · last frost Apr 25 Omaha, NE · Zone 6a Radishes Apr 7 Open ZIP-specific answer · last frost May 5 Aurora, CO · Zone 6a Radishes Apr 7 Open ZIP-specific answer · last frost May 5 Denver, CO · Zone 6a Radishes Apr 7 Open ZIP-specific answer · last frost May 5 Colorado Springs, CO · Zone 6a Radishes Apr 17 Open ZIP-specific answer · last frost May 15