When to Plant Kohlrabi in Boise, Idaho (83708)

Location

Boise, Idaho

ZIP Code

83708

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, March 13, 2026

Transplant Outdoors Friday, March 27, 2026

Pro Tip: Start Kohlrabi seeds indoors 4 weeks before your last frost date, then transplant outdoors around Friday, March 27, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. gongylodes

Days to Maturity 55 days

Mature Height 12-18"

Spread 8"

Type Bulb

Fruit Size Small-Medium (2-3 inch bulb)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (consistent moisture prevents cracking)

↔️

Spacing

6" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Kohlrabi in Boise?

Get your seeds now so they're ready by Friday, March 13, 2026.

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🤝 Good Companions

BeetOnionCucumberHerb

⚠️ Avoid Planting Near

TomatoPepperStrawberry

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Growing Kohlrabi in Zone 7a

Kohlrabi (Brassica oleracea var. gongylodes) is a popular garden vegetable. In Boise, Idaho, which is in USDA Hardiness Zone 7a, you should start seeds indoors around Friday, March 13, 2026.

Your average last frost date is Friday, April 10, 2026. Plan to transplant your Kohlrabi seedlings outdoors around Friday, March 27, 2026, about -2 weeks after your last frost date.