When should I plant Koper in Zone 4a?

Direct sow Koper outdoors around Apr 21. Expect first harvest around May 31.

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. Koper needs 40 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 5 successions.

Zone 4a has cold winters and a moderate growing season. Timing is key for Koper in this zone. Zadnja slana: May 5. Prva slana: Oct 1.

Outdoor

Harvest

Apr 21Oct 1

Season: May 5 – Oct 1 (149 dni) · Succession: plant every 3 weeks (up to 5x)

Cona4a

Zadnja slanaMay 5

Prva slanaOct 1

Sezona149 dni

Žetev40 dni

SoncePolno Sonce

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

First harvest approximately May 31 (~40 dni from planting). Continue harvesting until first frost (Oct 1).

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

❌ Korenje

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