When to Plant Cauliflower in Simms, Montana (59477)

Location

Simms, Montana

ZIP Code

59477

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, March 24, 2026

Transplant Outdoors Tuesday, May 5, 2026

Pro Tip: Start Cauliflower seeds indoors 6 weeks before your last frost date, then transplant outdoors around Tuesday, May 5, 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 Simms?

Get your seeds now so they're ready by Tuesday, March 24, 2026.

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🤝 Good Companions

BeetCeleryBeanOnion

⚠️ Avoid Planting Near

StrawberryTomato

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Growing Cauliflower in Zone 4b

Cauliflower (Brassica oleracea var. botrytis) is a popular garden vegetable. In Simms, Montana, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, March 24, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Cauliflower seedlings outdoors around Tuesday, May 5, 2026, about 0 weeks after your last frost date.