Zone 7 · Brassicas Growing Guide

When to Plant Cauliflower
in Zone 7

The most demanding brassica. Needs consistent temperatures — too hot or too cold and the head won't form. 'Blanching' (tying leaves over the head) keeps it white. Rewarding when it works.

Plant outdoors
Mar 1 – Apr 1, Aug 15 – Sep 15
Start indoors
Jan 25 – Feb 15
Last Frost
~Mar 15
Days to harvest
75–100 days
Difficulty
Hard
Growing — Zone 7
Harvest window: Apr – May, Nov – Jan

Planting Calendar

In Zone 7, Cauliflower should be planted outdoors Mar 1 – Apr 1, Aug 15 – Sep 15, after the average last frost date of approximately Mar 15. Start seeds indoors around Jan 25 – Feb 15 for a head start.

Fall/winter crop is primary in Zone 7. Spring crop is brief window before heat.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
18–24 inches
Soil
Rich, fertile, well-draining
Days to maturity
75–100 days
Soil pH
6.0–7.0
plant tip · Zone 7

Fall/winter crop is primary in Zone 7. Spring crop is brief window before heat.

Feeding Schedule

How often
monthly
Feed type
high nitrogen then balanced
Key timing
switch to balanced when curds form

Same as broccoli — nitrogen early, balanced once the head appears. Consistent moisture matters more than feeding.

Succession Planting

Sow every 4 weeks

Start a spring crop and a late-summer crop for autumn harvest. Cauliflower is tricky — succession helps spread risk as individual plants often fail.

Companion Planting for Cauliflower

What you plant next to cauliflower makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Celery
  • Onions
  • Hyssop
  • Spinach
Keep away from
  • Tomatoes
  • Strawberries
  • Beans
  • Fennel

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Common questions

In Zone 7, cauliflower has two planting windows: Mar 1 – Apr 1, Aug 15 – Sep 15. The spring window opens after your last frost around Mar 15. The fall window lets you grow a second crop before first frost around Nov 15. Fall/winter crop is primary in Zone 7. Spring crop is brief window before heat.
Zone 7 has an average last spring frost of approximately Mar 15 and a first fall frost around Nov 15. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for cauliflower include Celery, Onions, Hyssop, Spinach. Avoid planting near Tomatoes, Strawberries, Beans, Fennel, which can compete for nutrients or attract pests.
Cauliflower typically takes 75–100 days from transplant or direct sow to harvest in Zone 7. Expected harvest window: Apr – May, Nov – Jan.

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Cauliflower in other zones
Crop Guides