When should I plant Koriander in Zone 4a?

Direct sow Koriander outdoors around Apr 21. Expect first harvest around May 21.

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.

Yes. Koriander needs 30 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 8 successions.

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

Outdoor

Harvest

Apr 21Oct 1

Season: May 5 – Oct 1 (149 dager) · Succession: plant every 2 weeks (up to 8x)

Sone4a

Siste frostMay 5

Første frostOct 1

Sesong149 dager

Høst30 dager

SolHalvskygge

Direct sow Koriander seeds outdoors around Apr 21. Wait until soil temperature reaches 50F. Space plants at 4/m² (15cm avstand).

First harvest approximately May 21 (~30 dager from planting). Continue harvesting until first frost (Oct 1).

For a fall harvest, plant Koriander around Aug 20 (6 weeks before first frost).

✅ Tomater✅ Paprikaer✅ Bønner✅ Erter✅ Spinat

❌ Fennikel❌ Dill

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

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