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🌽 Growing Corn in Zone 3b
Zone 3b has harsh winters and a short growing season. Start Corn early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.
Planting Calendar
Season: May 15 – Sep 22 (130 days) · Succession: plant every 2 weeks (up to 3x)
When to Plant Corn in Zone 3b
Sow Seeds Outdoors: May 22
Direct sow Corn seeds outdoors around May 22. Soil temperature should be at least 60°F. Space at 4/sqft (6" apart).
Harvest: Aug 15
First harvest approximately Aug 15 (~85 days from planting). Continue harvesting until first frost (Sep 22).
Companion Planting
Corn 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 Corn in Zone 3b?
Direct sow Corn outdoors around May 22. Harvest around Aug 15.
What is the last frost date for Zone 3b?
The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.
Can I grow Corn in Zone 3b?
Yes. Corn needs 85 days to harvest. Zone 3b has a 130-day growing season, which is sufficient. You can plant up to 3 successions.
What is the best month to plant Corn in Zone 3b?
The best time to plant Corn in Zone 3b is around May 22, when soil temperatures are suitable and frost risk has passed.
What companion plants grow well with Corn?
Good companion plants for Corn include Beans, Squash, Cucumbers, Peas, Pumpkins. Avoid planting Corn near Tomatoes.
How long does Corn take to harvest?
Corn takes approximately 85 days from planting to harvest. In Zone 3b, expect your first harvest around Aug 15.
Plan Your Corn Garden
Track Corn from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Corn Growing Guide