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USDA hardiness zone by ZIP

USDA hardiness zone for ZIP 60601 (Chicago)

ZIP 60601 is USDA hardiness zone 6a; use the Chicago frost station's Apr 25 last frost and Oct 20 first frost to turn that zone into a planting calendar.

Source: chicago-ohare 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.

ZIP 60601 is in USDA hardiness zone 6a. For vegetables, the zone is useful context, but frost dates decide the actual planting window.

Use the ZIP calendar to turn the zone into crop-specific dates.

Planting calendars in zone 6a

Chicago, IL · Zone 6a Tomatoes May 2 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Peppers May 9 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Basil May 5 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Carrots Apr 4 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Lettuce Apr 11 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Cucumbers May 5 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Zucchini May 5 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Cilantro Apr 11 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Bush beans May 2 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Spinach Mar 28 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Radishes Mar 28 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Kale Apr 11 Open answer · last frost Apr 25 Chicago, IL · Zone 6a Watermelon May 9 Open answer · last frost Apr 25