When should I plant Soybean in Zone 4a?

Direct sow Soybean outdoors around May 12. Harvest around Aug 30.

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. Soybean needs 110 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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

Outdoor

Harvest

May 12Oct 1

Season: May 5 – Oct 1 (149 days)

Zone4a

Last FrostMay 5

First FrostOct 1

Season Length149 days

Days to Harvest110

SunFull Sun

Frost ToleranceNone

Spacing4/sqft (6" apart)

Direct sow Soybean seeds outdoors around May 12. Soil temperature should be at least 60°F. Space at 4/sqft (6" apart).

First harvest approximately Aug 30 (~110 days from planting). Continue harvesting until first frost (Oct 1).

❌ Onion❌ Garlic

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