When to Plant Cauliflower in Lothair, Montana (59461)

Location

Lothair, Montana

ZIP Code

59461

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, April 3, 2026

Transplant Outdoors Friday, May 15, 2026

Pro Tip: Start Cauliflower seeds indoors 6 weeks before your last frost date, then transplant outdoors around Friday, May 15, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. botrytis

Days to Maturity 75 days

Mature Height 18-24"

Spread 24"

Type Head

Fruit Size Medium (6-8 inch head)

☀️ Growing Requirements

☀️

Sun

Full Sun (6 hours)

💧

Water

Regular (1-1.5 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-10 days

Ready to Plant Cauliflower in Lothair?

Get your seeds now so they're ready by Friday, April 3, 2026.

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🤝 Good Companions

BeetCeleryBeanOnion

⚠️ Avoid Planting Near

StrawberryTomato

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Growing Cauliflower in Zone 4a

Cauliflower (Brassica oleracea var. botrytis) is a popular garden vegetable. In Lothair, 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 Cauliflower seedlings outdoors around Friday, May 15, 2026, about 0 weeks after your last frost date.