GrowZone

Frost dates by ZIP

Last and first frost dates for ZIP 60601 (Chicago, IL)

Chicago (ZIP 60601) has an average last spring frost around Apr 25 and first fall frost around Oct 20, about 178 frost-free days.

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.

Chicago (ZIP 60601) has an average last spring frost around Apr 25 and an average first fall frost around Oct 20, giving about 178 frost-free days.

Apr 25 last frost 178 frost-free days Oct 20 first frost

Crop calendars for ZIP 60601

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