When to Plant Celosia in Sweet Grass, Montana (59484)

Location

Sweet Grass, Montana

ZIP Code

59484

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, April 3, 2026

Transplant Outdoors Friday, May 22, 2026

Pro Tip: Start Celosia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Friday, May 22, 2026.

🌿 Plant Details

Scientific Name Celosia argentea

Days to Maturity 75 days

Mature Height 12-36"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

9" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 10-14 days

Ready to Plant Celosia in Sweet Grass?

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

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🤝 Good Companions

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Other Plants for Sweet Grass

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Growing Celosia in Zone 4a

Celosia (Celosia argentea) is a popular garden vegetable. In Sweet Grass, 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 Celosia seedlings outdoors around Friday, May 22, 2026, about 1 weeks after your last frost date.