When to Plant Broccoli in Richville, Minnesota (56576)

Location

Richville, Minnesota

ZIP Code

56576

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, April 3, 2026

Transplant Outdoors

Friday, May 15, 2026

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

Pro tip: Start Broccoli seeds indoors 6 weeks before your last frost date, then transplant outdoors around Friday, May 15, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. italica

Days to Maturity 60 days

Mature Height 18-30"

Spread 18"

Type Head

Fruit Size Medium (4-7 inch head)

☀️ Growing Requirements

☀️

Sun

Full Sun (6 hours)

💧

Water

Regular (1-1.5 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Broccoli in Richville?

Get your seeds now so they're ready by Friday, April 3, 2026.

🛒 Buy on Amazon 🌿 True Leaf Market

* Affiliate links — we may earn a small commission at no extra cost to you.

🤝 Good Companions

BeetCeleryOnionPotatoDill

⚠️ Avoid Planting Near

TomatoStrawberryPepper

🤝

Full Companion Planting Guide for Broccoli

See which plants help Broccoli 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

* Affiliate links — we may earn a small commission at no extra cost to you.

Common Broccoli Varieties

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

Calabrese

heading 65d

Italian heirloom producing a large central head followed by abundant side shoots.

Belstar

hybrid 65d

Compact hybrid with blue-green domed heads; excellent heat tolerance.

Romanesco

specialty 80d

Stunning lime-green fractal spirals with a mild, nutty flavor; technically a cross between broccoli and cauliflower.

Purple Sprouting

sprouting 180d

Overwintering variety that produces masses of small purple florets in early spring.

Common Broccoli Problems

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

🐛

Pests

Imported Cabbageworm

Velvety green caterpillar that chews large holes in leaves and heads; white butterflies lay eggs on plants.

Fix:

Apply Bt at first sign; use row covers from transplanting; check undersides of leaves for eggs.

Cabbage Looper

Light green looping caterpillar similar in damage to cabbageworm; holes in heads reduce market quality.

Fix:

Bt spray; row covers; spinosad for heavy infestations.

Cabbage Aphid

Dense gray waxy colonies deep in broccoli heads are very difficult to remove after harvest.

Fix:

Check undersides of leaves weekly; strong water jet; neem oil early in the season.

Flea Beetle

Hundreds of tiny holes in seedling leaves; rarely fatal but stresses transplants.

Fix:

Row covers on transplants; kaolin clay spray; healthy transplants usually outgrow the damage.

🍂

Diseases

Black Rot

V-shaped yellow lesions at leaf margins with black veins; seed-borne bacterial disease.

Fix:

Use certified seed; avoid overhead irrigation; destroy infected plants; rotate annually.

Clubroot

Soil-borne slime mold causes massive root deformation (clubs) and stunted, wilting plants.

Fix:

Raise soil pH to 7.0–7.2 with lime; do not plant brassicas in affected beds for 7+ years.

Downy Mildew

Yellow angular patches on upper leaves with purple-gray spores beneath; thrives in cool, wet conditions.

Fix:

Improve airflow; plant resistant varieties; apply copper fungicide preventively.

💡

Common Mistakes

Transplanting too late

Broccoli needs 6–8 weeks of cool weather to form heads; heat causes buttoning (tiny premature heads).

Fix:

Transplant 4–6 weeks before last spring frost; aim for heads to mature before summer heat.

Missing the harvest window

Broccoli heads open into yellow flowers within days of reaching peak size.

Fix:

Harvest when head is fully formed, tight, and deep green; before any yellow color develops in the buds.

Not harvesting side shoots

After cutting the main head, most varieties produce side shoots for weeks — but only if the main head is removed.

Fix:

Cut main head promptly, leaving the plant in the ground; side shoots will appear within 1–2 weeks.

🌾 Seed Saving Guide

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow side shoots to flower fully after main head harvest. Harvest seed pods when tan and dry.

Processing

Thresh dried pods in a bag, winnow seeds from pod fragments.

Seed Viability

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

Pro Tip

B. oleracea — crosses with all oleracea crops (kale, cabbage, cauliflower, kohlrabi). Isolate by 1000 feet.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Broccoli. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Broccoli in Richville, Minnesota? +

In Richville (Zone 4a), start Broccoli seeds indoors around Friday, April 3, 2026 and transplant outdoors around Friday, May 15, 2026.

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

The average last spring frost date for Richville, Minnesota (ZIP 56576) is around Friday, May 15, 2026. This is based on NOAA climate normals for USDA Zone 4a.

How long does Broccoli take to grow? +

Broccoli typically matures in about 60 days from transplanting. In Richville, that means you can expect harvest around Friday, May 15, 2026 plus 60 days.

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

Broccoli should be started indoors 6 weeks before your last frost date. In Richville, that means starting around Friday, April 3, 2026.

📚 More Broccoli Planting Guides

🗺️

Broccoli in Minnesota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4a Broccoli Guide

All cities in your zone · Avg dates

→

Other Plants for Richville

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 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 Radish 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 Broccoli in Zone 4a

Broccoli (Brassica oleracea var. italica) is a popular garden vegetable. In Richville, Minnesota, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, April 3, 2026.

Your average last frost date is Friday, May 15, 2026. Plan to transplant your Broccoli seedlings outdoors around Friday, May 15, 2026, about 0 weeks after your last frost date.