When to Plant Lemon Balm in Big Sandy, Montana (59520)
Location
Big Sandy, Montana
ZIP Code
59520
USDA Zone
4a
Last Frost
Friday, May 15, 2026
📅 Planting Calendar
Start Seeds Indoors Friday, April 3, 2026
Transplant Outdoors Friday, May 29, 2026
Pro Tip: Start Lemon Balm seeds indoors 6 weeks before your last frost date for best results.
🌿 Plant Details
Scientific Name Melissa officinalis
Days to Maturity 70 days
☀️ Growing Requirements
☀️
Sun
Full Sun
💧
Water
Regular
Seeds typically germinate in 7-14 days
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Growing Lemon Balm in Zone 4a
Lemon Balm (Melissa officinalis) is a popular garden vegetable. In Big Sandy, Montana, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, April 3, 2026.
Your average last frost date is Friday, May 15, 2026. Plan to transplant your Lemon Balm seedlings outdoors around Friday, May 29, 2026, about 2 weeks after your last frost date.