When should I plant Grønnkål in Zone 4a?

Start Grønnkål seeds indoors around Mar 24. Transplant outdoors after Apr 7. Expect first harvest around May 22.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is May 5. The first fall frost averages Oct 1, giving a 149-day growing season.

Can I grow Grønnkål in Zone 4a?

Yes. Grønnkål needs 60 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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🥬 Growing Grønnkål in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Grønnkål in this zone. Siste frost: May 5. Første frost: Oct 1.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 24Oct 1

Season: May 5 – Oct 1 (149 dager)

Sone4a

Siste frostMay 5

Første frostOct 1

Sesong149 dager

Høst60 dager

SolHalvskygge

When to Plant Grønnkål in Zone 4a

Start Seeds Indoors: Mar 24

Start Grønnkål seeds indoors around Mar 24 (6 uker før siste frost). Optimal germination temperature: 65F. Germinates in 5-10 days.

Transplant Outdoors: Apr 7

Transplant Grønnkål seedlings outdoors after Apr 7. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm avstand). Harden off plants for a week before moving outside.

Harvest: May 22

First harvest approximately May 22 (~45 dager from transplant). Continue harvesting until first frost (Oct 1). Grønnkål can overwinter in mild climates for continued harvest.

Fall Planting: Aug 6

For a fall harvest, plant Grønnkål around Aug 6 (8 weeks before first frost).

Samdyrking

✅ Salvie ✅ Dill✅ Løk✅ Rødbeter✅ Poteter

❌ Jordbær

Grønnkål 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

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