When to Plant Brussels Sprout in Caldwell, Idaho (83607)

Location

Caldwell, Idaho

ZIP Code

83607

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, January 16, 2026

Transplant Outdoors

Friday, April 10, 2026

Based on last frost Friday, April 10, 2026 · Zone 7a

Pro tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Friday, April 10, 2026.

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🌿 Plant Details

Scientific Name Brassica oleracea var. gemmifera

Days to Maturity 84 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Brussels Sprout in Caldwell?

Get your seeds now so they're ready by Friday, January 16, 2026.

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🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow some sprouts to open into flowers. Harvest seed pods in summer/fall when dry.

Processing

Thresh dry pods, winnow to separate seeds from chaff.

Seed Viability

Up to 5 years when stored cool, dark, and dry.

Pro Tip

B. oleracea — crosses freely with other cole crops. Biennial nature makes isolation especially challenging.

Frequently Asked Questions

When should I plant Brussels Sprout in Caldwell, Idaho? +

In Caldwell (Zone 7a), start Brussels Sprout seeds indoors around Friday, January 16, 2026 and transplant outdoors around Friday, April 10, 2026.

What is the last frost date for Caldwell, Idaho? +

The average last spring frost date for Caldwell, Idaho (ZIP 83607) is around Friday, April 10, 2026. This is based on NOAA climate normals for USDA Zone 7a.

How long does Brussels Sprout take to grow? +

Brussels Sprout typically matures in about 84 days from transplanting. In Caldwell, that means you can expect harvest around Friday, April 10, 2026 plus 84 days.

Should I start Brussels Sprout indoors or direct sow in Idaho? +

Brussels Sprout should be started indoors 12 weeks before your last frost date. In Caldwell, that means starting around Friday, January 16, 2026.

📚 More Brussels Sprout Planting Guides

🗺️

Brussels Sprout in Idaho

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7a Brussels Sprout Guide

All cities in your zone · Avg dates

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Growing Brussels Sprout in Zone 7a

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Caldwell, Idaho, which is in USDA Hardiness Zone 7a, you should start seeds indoors around Friday, January 16, 2026.

Your average last frost date is Friday, April 10, 2026. Plan to transplant your Brussels Sprout seedlings outdoors around Friday, April 10, 2026, about 0 weeks after your last frost date.