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🥦 Growing Broccoli in Zone 5b

Zone 5b has cold winters and a moderate growing season. Timing is key for Broccoli in this zone. Last frost: Apr 28. First frost: Oct 8.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 17Oct 8

Season: Apr 28 – Oct 8 (163 days)

Zone5b

Last FrostApr 28

First FrostOct 8

Season Length163 days

Days to Harvest70

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Broccoli in Zone 5b

Start Seeds Indoors: Mar 17

Start Broccoli seeds indoors around Mar 17 (6 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 5–10 days.

Transplant Outdoors: May 12

Transplant Broccoli seedlings outdoors after May 12. Wait until soil temperature reaches 50°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Jul 11

First harvest approximately Jul 11 (~60 days from transplant). Continue harvesting until first frost (Oct 8).

Fall Planting: Jul 16

For a fall harvest, plant Broccoli around Jul 16 (12 weeks before first frost).

Companion Planting

✅ Sage ✅ Rosemary ✅ Mint ✅ Chamomile ✅ Dill

❌ Strawberries❌ Tomatoes❌ Beans

Broccoli in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Broccoli in Zone 5b?

Start Broccoli seeds indoors around Mar 17. Transplant outdoors after May 12. Expect first harvest around Jul 11.

What is the last frost date for Zone 5b?

The average last spring frost date for Zone 5b is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.

Can I grow Broccoli in Zone 5b?

Yes. Broccoli needs 70 days to harvest. Zone 5b has a 163-day growing season, which is sufficient.

What is the best month to plant Broccoli in Zone 5b?

The best time to start Broccoli in Zone 5b is Mar. Begin seeds indoors around Mar 17, then transplant outdoors after the last frost date of Apr 28.

What companion plants grow well with Broccoli?

Good companion plants for Broccoli include Sage, Rosemary, Mint, Chamomile, Dill. Avoid planting Broccoli near Strawberries, Tomatoes, Beans.

How long does Broccoli take to harvest?

Broccoli takes approximately 70 days from planting to harvest. In Zone 5b, expect your first harvest around Jul 11.

Plan Your Broccoli Garden

Track Broccoli from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Broccoli Growing Guide