When to Plant Roma Tomato 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 19, 2026

Pro Tip: Start Roma Tomato seeds indoors 6 weeks before your last frost date, then transplant outdoors around Tuesday, May 19, 2026.

🌿 Plant Details

Scientific Name Solanum lycopersicum

Days to Maturity 75 days

Mature Height 30-36"

Spread 18"

Type Determinate

Fruit Size Medium (2-3 oz)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

24" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Roma Tomato in Simms?

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

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Growing Roma Tomato in Zone 4b

Roma Tomato (Solanum lycopersicum) 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 Roma Tomato seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.