When to Plant Marigold in Knoxville, Tennessee (37921)

Location

Knoxville, Tennessee

ZIP Code

37921

USDA Zone

Last Frost

Sunday, April 5, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, February 22, 2026

Transplant Outdoors Sunday, April 19, 2026

Pro Tip: Start Marigold seeds indoors 6 weeks before your last frost date, then transplant outdoors around Sunday, April 19, 2026.

🌿 Plant Details

Scientific Name Tagetes patula

Days to Maturity 50 days

Mature Height 6-24"

Spread 12"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Marigold in Knoxville?

Get your seeds now so they're ready by Sunday, February 22, 2026.

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🤝 Good Companions

TomatoPepperBasilSquash

See the full companion planting guide for Marigold →

Other Plants for Knoxville

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Growing Marigold in Zone 7b

Marigold (Tagetes patula) is a popular garden vegetable. In Knoxville, Tennessee, which is in USDA Hardiness Zone 7b, you should start seeds indoors around Sunday, February 22, 2026.

Your average last frost date is Sunday, April 5, 2026. Plan to transplant your Marigold seedlings outdoors around Sunday, April 19, 2026, about 2 weeks after your last frost date.