When to Plant Spaghetti Squash in Illinois
State
Illinois
Cities Covered
1286
USDA Zones
5a, 5b, 6a, 6b, 7a
Plant Type
Indoor Start
📅 Planting Calendar for Illinois
Based on Chicago (Zone 6b). Dates may vary by city.
Note: Illinois spans multiple zones (5a, 5b, 6a, 6b, 7a). Select your city below for more precise dates.
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Growing Spaghetti Squash in Illinois
Spaghetti Squash (Cucurbita pepo) is a popular garden vegetable in Illinois. The state spans USDA Hardiness Zones 5a, 5b, 6a, 6b, 7a, so planting dates can vary significantly depending on your location.
For most of Illinois, you should start Spaghetti Squash seeds indoors around Wednesday, March 18, 2026, then transplant outdoors around Wednesday, April 29, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.