When should I plant Ui in Zone 4b?

Start Ui seeds indoors around Feb 20. Transplant outdoors after Apr 3. Expect first harvest around Jun 22.

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 Ui in Zone 4b?

Yes. Ui needs 110 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.

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🧅 Kweken van Ui in Zone 4b

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

Planting Calendar

Indoor

Outdoor

Harvest

Feb 20Oct 5

Season: May 1 – Oct 5 (157 dagen)

Zone4b

Laatste vorstMay 1

Eerste vorstOct 5

Seizoen157 dagen

Oogst110 dagen

ZonVolle Zon

When to Plant Ui in Zone 4b

Start Seeds Indoors: Feb 20

Start Ui seeds indoors around Feb 20 (10 weken voor de laatste vorst). Optimal germination temperature: 70F. Germinates in 7-14 days.

Transplant Outdoors: Apr 3

Transplant Ui seedlings outdoors after Apr 3. Wait until soil temperature reaches 45F. Space plants at 9/m² (10cm afstand). Harden off plants for a week before moving outside.

Harvest: Jun 22

First harvest approximately Jun 22 (~80 dagen from transplant). Continue harvesting until first frost (Oct 5).

Begeleidende Beplanting

✅ Aardbeien✅ Kool✅ Rode Bieten✅ Sla✅ Wortels✅ Tomaten

❌ Bonen❌ Erwten

Ui 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 Ui

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

Start Free Ui Growing Guide