When should I plant Koriander in Zone 4b?

Direct sow Koriander outdoors around Apr 17. Expect first harvest around May 17.

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.

Yes. Koriander needs 30 days to harvest. Zone 4b has a 157-day growing season, which is sufficient. You can plant up to 9 successions.

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

Outdoor

Harvest

Apr 17Oct 5

Season: May 1 – Oct 5 (157 dager) · Succession: plant every 2 weeks (up to 9x)

Sone4b

Siste frostMay 1

Første frostOct 5

Sesong157 dager

Høst30 dager

SolHalvskygge

Direct sow Koriander seeds outdoors around Apr 17. Wait until soil temperature reaches 50F. Space plants at 4/m² (15cm avstand).

First harvest approximately May 17 (~30 dager from planting). Continue harvesting until first frost (Oct 5).

For a fall harvest, plant Koriander around Aug 24 (6 weeks before first frost).

✅ Tomater✅ Paprikaer✅ Bønner✅ Erter✅ Spinat

❌ Fennikel❌ Dill

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