Planting Date · Broccoli
Broccoli Planting Date Calculator
Calculate the optimal planting dates for broccoli based on your USDA zone, last frost date, and preferred start method.
Optimal Soil Temp
50°F
Days to Maturity
65 days
Frost Tolerance
semi hardy
Planting Depth
1/4 inch
Input
Fill in the fields below, then click Calculate.
Select your USDA plant hardiness zone (3–10).
Approximate month of your last spring frost.
How you plan to start the crop.
No results yet
Fill in the fields and click Calculate to see results.
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What to Calculate Next
How to Use This Calculator
Select your USDA hardiness zone and the month of your last expected spring frost. Choose whether you plan to direct sow or start broccoli transplants indoors. The calculator uses frost tolerance data and days to maturity to recommend optimal planting windows.
Why This Matters
Planting broccoli at the right time is critical for success. Planting too early exposes young plants to cold damage, while planting too late shortens the growing season and reduces yield. Timing varies significantly by USDA zone.
Methodology
This calculator uses USDA hardiness zone frost date tables and crop-specific data: Broccoli requires 65 days to maturity, has semi-hardy frost tolerance, and needs soil temperatures of at least 50°F. Indoor start dates are calculated by subtracting transplant lead time from the last frost date.
Common Mistakes to Avoid
- Planting based on calendar date rather than soil temperature and frost risk.
- Not hardening off broccoli transplants before moving them outdoors.
- Ignoring microclimates — low-lying areas frost later in spring and earlier in fall.
- Forgetting that broccoli needs 65 days to reach maturity when planning fall plantings.
Tips & Best Practices
- Start seeds indoors 6–8 weeks before the last frost for a spring crop.
- Transplant seedlings 2–3 weeks before the last frost.
- Broccoli bolts in hot weather — time your crop to mature before summer heat.
- After harvesting the main head, many varieties produce smaller side shoots for weeks.