When should I plant Grønkål in Zone 4b?

Start Grønkål 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 Grønkål in Zone 4b?

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

🥬

🥬 Growing Grønkål in Zone 4b

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

Planting Calendar

Indoor

Outdoor

Harvest

Mar 20Oct 5

Season: May 1 – Oct 5 (157 dage)

Zone4b

Sidste frostMay 1

Første frostOct 5

Sæson157 dage

Høst60 dage

SolHalvskygge

When to Plant Grønkål in Zone 4b

Start Seeds Indoors: Mar 20

Start Grønkål seeds indoors around Mar 20 (6 uger før sidste frost). Optimal germination temperature: 65F. Germinates in 5-10 days.

Transplant Outdoors: Apr 3

Transplant Grønkål 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 dage from transplant). Continue harvesting until first frost (Oct 5). Grønkål can overwinter in mild climates for continued harvest.

Fall Planting: Aug 10

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

Samdyrkning

✅ Salvie ✅ Dild✅ Løg✅ Rødbeder✅ Kartofler

❌ Jordbær

Grønkål 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

Plan Your Garden Grønkål

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

Start Free Grønkål Growing Guide