When to Plant Heirloom Tomato in Michigan
State
Michigan
Cities Covered
881
USDA Zones
4a, 4b, 5a, 5b, 6a, 6b, 7a
Plant Type
Indoor Start
📅 Planting Calendar for Michigan
Based on Detroit (Zone 6b). Dates may vary by city.
Note: Michigan spans multiple zones (4a, 4b, 5a, 5b, 6a, 6b, 7a). Select your city below for more precise dates.
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Growing Heirloom Tomato in Michigan
Heirloom Tomato (Solanum lycopersicum) is a popular garden vegetable in Michigan. The state spans USDA Hardiness Zones 4a, 4b, 5a, 5b, 6a, 6b, 7a, so planting dates can vary significantly depending on your location.
For most of Michigan, you should start Heirloom Tomato seeds indoors around Wednesday, March 4, 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.