When to Plant Mustard in Corwith, Iowa (50430)
Location
Corwith, Iowa
ZIP Code
50430
USDA Zone
5a
Last Frost
Sunday, May 10, 2026
📅 Planting Calendar
Direct Sow Outdoors Sunday, March 29, 2026
Pro Tip: Mustard can be directly sown outdoors. Plant 6 weeks before your last frost date.
🌿 Plant Details
Scientific Name Brassica juncea
Days to Maturity 56 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 1-7 days
🤝 Good Companions
CabbageCauliflowerRadishBrussel SproutTurnip
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Growing Mustard in Zone 5a
Mustard (Brassica juncea) is a popular garden vegetable. In Corwith, Iowa, which is in USDA Hardiness Zone 5a, you should direct sow seeds around Sunday, March 29, 2026.
Your average last frost date is Sunday, May 10, 2026. Mustard grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.