When should I plant Boerenkool in Zone 4b?

Start Boerenkool seeds indoors around Mar 20. Transplant outdoors after Apr 3. Expect first harvest around May 18.

What is the last frost date for Zone 4b?

The average last spring frost date for Zone 4b is May 1. The first fall frost averages Oct 5, giving a 157-day growing season.

Can I grow Boerenkool in Zone 4b?

Yes. Boerenkool needs 60 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.

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🥬 Kweken van Boerenkool in Zone 4b

Zone 4b has cold winters and a moderate growing season. Timing is key for Boerenkool in this zone. Laatste vorst: May 1. Eerste vorst: Oct 5.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 20Oct 5

Season: May 1 – Oct 5 (157 dagen)

Zone4b

Laatste vorstMay 1

Eerste vorstOct 5

Seizoen157 dagen

Oogst60 dagen

ZonHalfschaduw

When to Plant Boerenkool in Zone 4b

Start Seeds Indoors: Mar 20

Start Boerenkool seeds indoors around Mar 20 (6 weken voor de laatste vorst). Optimal germination temperature: 65F. Germinates in 5-10 days.

Transplant Outdoors: Apr 3

Transplant Boerenkool seedlings outdoors after Apr 3. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm afstand). Harden off plants for a week before moving outside.

Harvest: May 18

First harvest approximately May 18 (~45 dagen from transplant). Continue harvesting until first frost (Oct 5). Boerenkool can overwinter in mild climates for continued harvest.

Fall Planting: Aug 10

For a fall harvest, plant Boerenkool around Aug 10 (8 weeks before first frost).

Begeleidende Beplanting

✅ Salie ✅ Dille✅ Uien✅ Rode Bieten✅ Aardappels

❌ Aardbeien

Boerenkool in Andere 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

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

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