Growing Soybean in Zone 3a
Zone 3a has harsh winters and a short growing season. Start Soybean early indoors to maximize your harvest window. Last frost: May 22. First frost: Sep 12.
Planting Calendar
Season: May 22 – Sep 12 (113 days)
When to Plant Soybean in Zone 3a
Sow Seeds Outdoors: May 29
Direct sow Soybean seeds outdoors around May 29. Soil temperature should be at least 60°F. Space at 4/sqft (6" apart).
Harvest: Sep 16
First harvest approximately Sep 16 (~110 days from planting). Continue harvesting until first frost (Sep 12).
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 3a?
Direct sow Soybean outdoors around May 29. Harvest around Sep 16.
What is the last frost date for Zone 3a?
The average last spring frost date for Zone 3a is May 22. The first fall frost averages Sep 12, giving a 113-day growing season.
Can I grow Soybean in Zone 3a?
Yes. Soybean needs 110 days to harvest. Zone 3a has a 113-day growing season, which is sufficient.
What is the best month to plant Soybean in Zone 3a?
The best time to plant Soybean in Zone 3a is around May 29, 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 3a, expect your first harvest around Sep 16.
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