When to Plant Beefsteak Tomato in Colorado
State
Colorado
Cities Covered
397
USDA Zones
4a, 4b, 5a, 5b, 6a, 6b, 7a
Plant Type
Indoor Start
📅 Planting Calendar for Colorado
Based on Denver (Zone 6a). Dates may vary by city.
Note: Colorado spans multiple zones (4a, 4b, 5a, 5b, 6a, 6b, 7a). Select your city below for more precise dates.
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Growing Beefsteak Tomato in Colorado
Beefsteak Tomato (Solanum lycopersicum) is a popular garden vegetable in Colorado. 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 Colorado, you should start Beefsteak Tomato seeds indoors around Monday, March 9, 2026, then transplant outdoors around Monday, May 4, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.