When should I plant Kool in Zone 4b?

Start Kool seeds indoors around Mar 20. Transplant outdoors after Apr 10. Expect first harvest around Jun 14.

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 Kool in Zone 4b?

Yes. Kool needs 80 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.

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🥬 Kweken van Kool in Zone 4b

Zone 4b has cold winters and a moderate growing season. Timing is key for Kool 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

Oogst80 dagen

ZonVolle Zon

When to Plant Kool in Zone 4b

Start Seeds Indoors: Mar 20

Start Kool seeds indoors around Mar 20 (6 weken voor de laatste vorst). Optimal germination temperature: 70F. Germinates in 5-10 days.

Transplant Outdoors: Apr 10

Transplant Kool seedlings outdoors after Apr 10. Wait until soil temperature reaches 45F. Space plants at 1/m² (30cm afstand). Harden off plants for a week before moving outside.

Harvest: Jun 14

First harvest approximately Jun 14 (~65 dagen from transplant). Continue harvesting until first frost (Oct 5).

Fall Planting: Jul 13

For a fall harvest, plant Kool around Jul 13 (12 weeks before first frost).

Begeleidende Beplanting

✅ Aardappels✅ Munt ✅ Dille✅ Uien✅ Selderij

❌ Bonen❌ Tomaten❌ Aardbeien

Kool 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

Plan Je Tuin voor Kool

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

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