When to Plant Fennel in Montana
State
Montana
Cities Covered
360
USDA Zones
3b, 4a, 4b, 5a, 5b, 6a, 6b
Plant Type
Indoor Start
📅 Planting Calendar for Montana
Based on Absarokee (Zone 5a). Dates may vary by city.
Note: Montana spans multiple zones (3b, 4a, 4b, 5a, 5b, 6a, 6b). Select your city below for more precise dates.
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Growing Fennel in Montana
Fennel (Foeniculum vulgare) is a popular garden vegetable in Montana. The state spans USDA Hardiness Zones 3b, 4a, 4b, 5a, 5b, 6a, 6b, so planting dates can vary significantly depending on your location.
For most of Montana, you should start Fennel seeds indoors around Sunday, April 12, 2026, then transplant outdoors around Sunday, April 26, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.