When to Plant Sweet Pea in Lothair, Montana (59461)

Location

Lothair, Montana

ZIP Code

59461

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Planting Calendar

Direct Sow Outdoors Friday, April 17, 2026

Pro Tip: Sow Sweet Pea directly outdoors 4 weeks before your last frost date.

🌿 Plant Details

Scientific Name Lathyrus odoratus

Days to Maturity 65 days

Mature Height 48-72"

Spread 8"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 10-21 days

Ready to Plant Sweet Pea in Lothair?

Get your seeds now so they're ready by Friday, April 17, 2026.

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🤝 Good Companions

CarrotRadishSpinach

⚠️ Avoid Planting Near

OnionGarlic

Other Plants for Lothair

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Growing Sweet Pea in Zone 4a

Sweet Pea (Lathyrus odoratus) is a popular garden vegetable. In Lothair, Montana, which is in USDA Hardiness Zone 4a, you should direct sow seeds around Friday, April 17, 2026.

Your average last frost date is Friday, May 15, 2026. Sweet Pea grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.