When to Plant Radicchio in Box Elder, Montana (59521)

Location

Box Elder, Montana

ZIP Code

59521

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, April 17, 2026

Transplant Outdoors

Friday, May 1, 2026

Based on last frost Friday, May 15, 2026 · Zone 4a

Pro tip: Start Radicchio seeds indoors 4 weeks before your last frost date, then transplant outdoors around Friday, May 1, 2026.

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🌿 Plant Details

Scientific Name Cichorium intybus

Days to Maturity 80 days

Mature Height 6-12"

Spread 10"

Type Head

Fruit Size Small-Medium (fist-sized head)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (keep moist)

↔️

Spacing

10" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Radicchio in Box Elder?

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

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🤝 Good Companions

CarrotRadishLettuce

🤝

Full Companion Planting Guide for Radicchio

See which plants help Radicchio thrive, which to keep away, and raised bed layout tips →

🛠️ 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

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plants to bolt in year 2 and seed heads to dry on the stalk.

Processing

Cut dried stalks, thresh and winnow to separate seeds.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Radicchio is a chicory — crosses with endive, escarole, and wild chicory. Isolate by 300 feet.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 46 plants of Radicchio. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Radicchio in Box Elder, Montana? +

In Box Elder (Zone 4a), start Radicchio seeds indoors around Friday, April 17, 2026 and transplant outdoors around Friday, May 1, 2026.

What is the last frost date for Box Elder, Montana? +

The average last spring frost date for Box Elder, Montana (ZIP 59521) is around Friday, May 15, 2026. This is based on NOAA climate normals for USDA Zone 4a.

How long does Radicchio take to grow? +

Radicchio typically matures in about 80 days from transplanting. In Box Elder, that means you can expect harvest around Friday, May 1, 2026 plus 80 days.

Should I start Radicchio indoors or direct sow in Montana? +

Radicchio should be started indoors 4 weeks before your last frost date. In Box Elder, that means starting around Friday, April 17, 2026.

📚 More Radicchio Planting Guides

🗺️

Radicchio in Montana

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4a Radicchio Guide

All cities in your zone · Avg dates

→

Other Plants for Box Elder

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Growing Radicchio in Zone 4a

Radicchio (Cichorium intybus) is a popular garden vegetable. In Box Elder, Montana, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, April 17, 2026.

Your average last frost date is Friday, May 15, 2026. Plan to transplant your Radicchio seedlings outdoors around Friday, May 1, 2026, about -2 weeks after your last frost date.