GrowZone

Crop by USDA zone

When to plant radishes in zone 12b

In USDA zone 12b, plant radishes around Dec 4, after the representative last frost near Jan 1.

This page summarizes the supported ZIPs in zone 12b. 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 Honolulu, HI

StepDateHow to use it
Direct SowDecember 4, 2025Sow seed outside when the crop and soil can handle the window.
Honolulu, HI · Zone 12b Radishes Dec 4 Open ZIP-specific answer · last frost Jan 1