Zone 5 · Brassicas Growing Guide

When to Plant Broccoli
in Zone 5

Harvest the central head before flowers open, then enjoy weeks of side shoots. Temperature-sensitive — needs cool weather for heading. Medium difficulty but very rewarding.

Plant outdoors
Apr 15 – May 15, Jul 20 – Aug 10
Start indoors
Mar 10 – Apr 1
Last Frost
~Apr 15
Days to harvest
70–100 days
Difficulty
Medium
Plant now — Zone 5
Harvest window: Jun – Jul, Oct – Nov

Planting Calendar

In Zone 5, Broccoli should be planted outdoors Apr 15 – May 15, Jul 20 – Aug 10, after the average last frost date of approximately Apr 15. Start seeds indoors around Mar 10 – Apr 1 for a head start.

Two-season crop. Fall crop is often more productive and less pest-prone.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Regular
Spacing
18–24 inches
Soil
Rich, fertile, well-draining
Days to maturity
70–100 days
Soil pH
6.0–7.0
plant tip · Zone 5

Two-season crop. Fall crop is often more productive and less pest-prone.

Feeding Schedule

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

Heavy nitrogen feeder for leaf development. Switch to balanced feed once heads begin to form to avoid loose, leafy heads.

Succession Planting

Sow every 4 weeks

Start a spring crop and a separate late-summer crop for autumn harvest. Broccoli is too slow for true succession but two planned crops — one for spring harvest, one for autumn — make good use of the season.

Companion Planting for Broccoli

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

Grows well with
  • Celery
  • Onions
  • Potatoes
  • Chamomile
Keep away from
  • Tomatoes
  • Strawberries
  • Beans

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Common questions

In Zone 5, start broccoli seeds indoors around Mar 10 – Apr 1, then transplant outdoors Apr 15 – May 15, Jul 20 – Aug 10 after your last frost around Apr 15. Two-season crop. Fall crop is often more productive and less pest-prone.
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 broccoli include Celery, Onions, Potatoes, Chamomile. Avoid planting near Tomatoes, Strawberries, Beans, which can compete for nutrients or attract pests.
Broccoli typically takes 70–100 days from transplant or direct sow to harvest in Zone 5. Expected harvest window: Jun – Jul, Oct – Nov.

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Broccoli in other zones
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