Zone 10 · Brassicas Growing Guide

When to Plant Brussels Sprouts
in Zone 10

The most patient brassica — needs cold to form tight buttons. Flavour dramatically improves after frost. Definitely a fall crop.

Plant outdoors
Sep 15 – Oct 15
Start indoors
Aug 1 – Sep 1
Last Frost
~Jan 15
Days to harvest
90–110 days
Difficulty
Hard
Wrong season — Zone 10
Harvest window: Dec – Feb

Planting Calendar

In Zone 10, Brussels Sprouts should be planted outdoors Sep 15 – Oct 15, after the average last frost date of approximately Jan 15. Start seeds indoors around Aug 1 – Sep 1 for a head start.

Challenging in Zone 10 heat.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
18–24 inches
Soil
Rich, fertile, well-draining
Days to maturity
90–110 days
Soil pH
6.0–7.5
plant tip · Zone 10

Challenging in Zone 10 heat.

Feeding Schedule

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

Long season crop. Feed monthly. Avoid excess nitrogen late season or sprouts will be loose and leafy.

Companion Planting for Brussels Sprouts

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

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

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Common questions

In Zone 10, brussels sprouts is a fall-planted crop. Plant outdoors Sep 15 – Oct 15 once temperatures cool in autumn. It overwinters and is ready to harvest around Dec – Feb. No last frost consideration — plant before the ground freezes.
Zone 10 has an average last spring frost of approximately Jan 15 and a first fall frost around Dec 31. 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 brussels sprouts include Celery, Onions, Hyssop. Avoid planting near Tomatoes, Strawberries, Fennel, which can compete for nutrients or attract pests.
Brussels Sprouts typically takes 90–110 days from transplant or direct sow to harvest in Zone 10. Expected harvest window: Dec – Feb.

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Brussels Sprouts in other zones
Crop Guides