When should I plant Ui in Zone 9b?

Start Ui seeds indoors around Dec 30. Transplant outdoors after Feb 10. Expect first harvest around May 1.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Ui in Zone 9b?

Yes. Ui needs 110 days to harvest. Zone 9b has a 250-day growing season, which is sufficient.

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🧅 Kweken van Ui in Zone 9b

Zone 9b has warm winters and an extended growing season -- excellent for heat-loving crops like Ui. Laatste vorst: Mar 10. Eerste vorst: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 30Nov 15

Season: Mar 10 – Nov 15 (250 dagen)

Zone9b

Laatste vorstMar 10

Eerste vorstNov 15

Seizoen250 dagen

Oogst110 dagen

ZonVolle Zon

When to Plant Ui in Zone 9b

Start Seeds Indoors: Dec 30

Start Ui seeds indoors around Dec 30 (10 weken voor de laatste vorst). Optimal germination temperature: 70F. Germinates in 7-14 days.

Transplant Outdoors: Feb 10

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

Harvest: May 1

First harvest approximately May 1 (~80 dagen from transplant). Continue harvesting until first frost (Nov 15).

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