When to Plant Brussels Sprout in Lothair, Montana (59461)

Location

Lothair, Montana

ZIP Code

59461

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, February 20, 2026

Transplant Outdoors Friday, May 15, 2026

Pro Tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Friday, May 15, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. gemmifera

Days to Maturity 84 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Brussels Sprout in Lothair?

Get your seeds now so they're ready by Friday, February 20, 2026.

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Growing Brussels Sprout in Zone 4a

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Lothair, Montana, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, February 20, 2026.

Your average last frost date is Friday, May 15, 2026. Plan to transplant your Brussels Sprout seedlings outdoors around Friday, May 15, 2026, about 0 weeks after your last frost date.