When to Plant Radish in Lanesboro, Minnesota (55949)

Location

Lanesboro, Minnesota

ZIP Code

55949

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Tuesday, March 24, 2026

Based on last frost Tuesday, May 5, 2026 · Zone 4b

Pro tip: Sow Radish directly outdoors 6 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Rhaphanus sativus

Days to Maturity 25 days

Mature Height 6-12"

Spread 3"

Type Root

Fruit Size Small (1-2 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (keep moist)

↔️

Spacing

2" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 3-7 days

Ready to Plant Radish in Lanesboro?

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

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🤝 Good Companions

CarrotLettucePeaCucumberSpinach

⚠️ Avoid Planting Near

Hyssop

🤝

Full Companion Planting Guide for Radish

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

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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Common Radish Varieties

Popular cultivars to look for at your local nursery or seed supplier.

Cherry Belle

spring 22d

Round, bright red radish that matures in just 22 days; the classic spring radish.

French Breakfast

spring 25d

Elongated red-tipped radish with milder flavor and crisp, white interior.

Watermelon (Shinrimei)

daikon 60d

Chinese daikon with green exterior and stunning magenta-pink interior; mild and sweet.

Daikon

daikon 60d

Long, white Japanese radish used fresh, pickled, or cooked; much larger and milder than spring types.

Common Radish Problems

What to watch for — and how to fix it before it spreads.

🐛

Pests

Flea Beetle

Tiny beetles make hundreds of small holes in leaves; seedlings can be badly damaged.

Fix:

Use row covers immediately after sowing; apply diatomaceous earth; sow densely and sacrifice outer rows.

Cabbage Root Maggot

Fly larvae tunnel into roots, leaving rusty tunnels and stunting plants.

Fix:

Use row covers from sowing; delay planting spring radishes until after peak fly emergence.

🍂

Diseases

Downy Mildew

Yellow patches on leaves with gray spores beneath; common in cool, wet springs.

Fix:

Improve airflow; avoid overhead watering; rotate with non-brassica crops.

Black Root

Interior of roots turns gray-black from Aphanomyces fungus; common in wet, acidic soils.

Fix:

Raise soil pH to 6.5–7.0; rotate crops; use certified disease-free seed.

💡

Common Mistakes

Sowing too late in the season

Radishes bolt immediately in heat, going straight to flowers without forming a root.

Fix:

Sow in early spring and again in late summer/fall; avoid sowing when temps will exceed 75°F.

Leaving in the ground too long

Radishes go pithy and hollow quickly after reaching mature size.

Fix:

Check spring radishes starting at day 20–25; harvest when roots reach pencil-width to marble-size.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let plants bolt and seed pods dry completely on the plant until papery and tan.

Processing

Thresh dried pods to release round seeds, winnow to remove chaff.

Seed Viability

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

Pro Tip

Radishes cross readily between varieties and with wild radish — isolate by 1000 feet for pure seed.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 36 per sq ft of Radish. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Radish in Lanesboro, Minnesota? +

In Lanesboro (Zone 4b), direct sow Radish outdoors around Tuesday, March 24, 2026.

What is the last frost date for Lanesboro, Minnesota? +

The average last spring frost date for Lanesboro, Minnesota (ZIP 55949) is around Tuesday, May 5, 2026. This is based on NOAA climate normals for USDA Zone 4b.

How long does Radish take to grow? +

Radish typically matures in about 25 days from direct sowing. In Lanesboro, that means you can expect harvest around Tuesday, March 24, 2026 plus 25 days.

Should I start Radish indoors or direct sow in Minnesota? +

Radish does best when direct sown outdoors. In Lanesboro, sow directly around Tuesday, March 24, 2026.

📚 More Radish Planting Guides

🗺️

Radish in Minnesota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4b Radish Guide

All cities in your zone · Avg dates

→

Other Plants for Lanesboro

Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Cilantro Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Leek Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Cosmos Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Mizuna Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Celosia Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Radish in Zone 4b

Radish (Rhaphanus sativus) is a popular garden vegetable. In Lanesboro, Minnesota, which is in USDA Hardiness Zone 4b, you should direct sow seeds around Tuesday, March 24, 2026.

Your average last frost date is Tuesday, May 5, 2026. Radish grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.