When to Plant Cauliflower – Harvest to Table
Set cauliflower seedlings in the garden about two or three weeks before the average last frost date, not earlier. Sow cauliflower seeds indoors 4 to 6 weeks before setting seedlings in the garden. Cauliflower grows best at 57° to 68°F (14°-20°C). Time cauliflower planting so that plants do not mature in hot, head-stunting summer weather.