Zone 6 · Brassicas Growing Guide

When to Plant Brussels Sprouts
in Zone 6

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

Plant outdoors
Apr 15 – Jun 15
Start indoors
Mar 10 – Apr 1
Last Frost
~Apr 1
Days to harvest
90–110 days
Difficulty
Hard
Growing — Zone 6
Harvest window: Oct – Jan

Planting Calendar

In Zone 6, Brussels Sprouts should be planted outdoors Apr 15 – Jun 15, after the average last frost date of approximately Apr 1. Start seeds indoors around Mar 10 – Apr 1 for a head start.

Excellent fall/winter crop. Can stand into January.

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 6

Excellent fall/winter crop. Can stand into January.

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 6, start brussels sprouts seeds indoors around Mar 10 – Apr 1, then transplant outdoors Apr 15 – Jun 15 after your last frost around Apr 1. Excellent fall/winter crop. Can stand into January.
Zone 6 has an average last spring frost of approximately Apr 1 and a first fall frost around Oct 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 6. Expected harvest window: Oct – Jan.

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Brussels Sprouts in other zones
Crop Guides