Planting guide · zone 9b
When to plant broccoli in zone 9b
In zone 9b, the average last spring frost is Feb 14 and the first fall frost is Dec 12. Here is broccoli's whole year, counted from those dates.
Dec 20, 2025Start seeds indoorsSpring
Jan 24Transplant into the gardenSpring
Aug 29Start seeds indoorsFall
Oct 3Transplant into the gardenFall
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Soil & site
Rich, firm, consistently moist soil. Stress at any point risks “buttoning” — tiny premature heads.
Seedling care
Set starts slightly deeper than the pot, up to the first leaves. Water in well and shade for a day if it's hot.
Growing notes
Row cover at transplant blocks cabbage moths. Steady water is non-negotiable for good heads. Rows 24–30 in.
Harvest
Cut the main head while buds are tight, with 5–6 in of stem. Side shoots keep coming for weeks after.