Growing Soybean in Zone 4b
Zone 4b has cold winters and a moderate growing season. Timing is key for Soybean in this zone. Last frost: May 1. First frost: Oct 5.
Planting Calendar
Season: May 1 – Oct 5 (157 days)
When to Plant Soybean in Zone 4b
Sow Seeds Outdoors: May 8
Direct sow Soybean seeds outdoors around May 8. Soil temperature should be at least 60°F. Space at 4/sqft (6" apart).
Harvest: Aug 26
First harvest approximately Aug 26 (~110 days from planting). Continue harvesting until first frost (Oct 5).
Companion Planting
Soybean in Other 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 13bFrequently Asked Questions
When should I plant Soybean in Zone 4b?
Direct sow Soybean outdoors around May 8. Harvest around Aug 26.
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.
Can I grow Soybean in Zone 4b?
Yes. Soybean needs 110 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.
What is the best month to plant Soybean in Zone 4b?
The best time to plant Soybean in Zone 4b is around May 8, when soil temperatures are suitable and frost risk has passed.
What companion plants grow well with Soybean?
Good companion plants for Soybean include Corn, Squash, Sesame. Avoid planting Soybean near Onion, Garlic.
How long does Soybean take to harvest?
Soybean takes approximately 110 days from planting to harvest. In Zone 4b, expect your first harvest around Aug 26.
Plan Your Soybean Garden
Track Soybean from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Soybean Growing Guide