GrowZone

Crop by USDA zone

When to plant spinach in zone 6a

In USDA zone 6a, plant spinach 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 spinach dates by ZIP code.

Seed starting schedule

Spinach 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 Spinach Apr 12 Open ZIP-specific answer · last frost May 10 Chicago, IL · Zone 6a Spinach Mar 28 Open ZIP-specific answer · last frost Apr 25 Omaha, NE · Zone 6a Spinach Apr 7 Open ZIP-specific answer · last frost May 5 Aurora, CO · Zone 6a Spinach Apr 7 Open ZIP-specific answer · last frost May 5 Denver, CO · Zone 6a Spinach Apr 7 Open ZIP-specific answer · last frost May 5 Colorado Springs, CO · Zone 6a Spinach Apr 17 Open ZIP-specific answer · last frost May 15