Zone 5 · Brassicas Growing Guide

When to Plant Brussels Sprouts
in Zone 5

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

Plant outdoors
Apr 25 – May 20
Start indoors
Mar 20 – Apr 10
Last Frost
~Apr 15
Days to harvest
90–110 days
Difficulty
Hard
Plant now — Zone 5
Harvest window: Oct – Dec

Planting Calendar

In Zone 5, Brussels Sprouts should be planted outdoors Apr 25 – May 20, after the average last frost date of approximately Apr 15. Start seeds indoors around Mar 20 – Apr 10 for a head start.

Spring planting for fall harvest. Light frosts improve flavour.

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 5

Spring planting for fall harvest. Light frosts improve flavour.

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 5, start brussels sprouts seeds indoors around Mar 20 – Apr 10, then transplant outdoors Apr 25 – May 20 after your last frost around Apr 15. Spring planting for fall harvest. Light frosts improve flavour.
Zone 5 has an average last spring frost of approximately Apr 15 and a first fall frost around Oct 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 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 5. Expected harvest window: Oct – Dec.

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Brussels Sprouts in other zones
Crop Guides