When to Plant Lima Bean in Fort Benton, Montana (59442)
Location
Fort Benton, Montana
ZIP Code
59442
USDA Zone
4a
Last Frost
Friday, May 15, 2026
📅 Planting Calendar
Direct Sow Outdoors Friday, April 3, 2026
Pro Tip: Lima Bean can be directly sown outdoors. Plant 6 weeks before your last frost date.
🌿 Plant Details
Scientific Name Phaseolus lunatus
Days to Maturity 75 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 7-14 days
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Growing Lima Bean in Zone 4a
Lima Bean (Phaseolus lunatus) is a popular garden vegetable. In Fort Benton, Montana, which is in USDA Hardiness Zone 4a, you should direct sow seeds around Friday, April 3, 2026.
Your average last frost date is Friday, May 15, 2026. Lima Bean grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.