When to Plant Green Bean in Box Elder, Montana (59521)

Location

Box Elder, Montana

ZIP Code

59521

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Friday, April 3, 2026

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

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

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🌿 Plant Details

Scientific Name Phaseolus vulgaris

Days to Maturity 55 days

Mature Height 18-24"

Spread 6"

Type Bush

Fruit Size Medium (4-6 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1 inch/week)

↔️

Spacing

4" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 7-14 days

Ready to Plant Green Bean in Box Elder?

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

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🤝 Good Companions

CornSquashCarrotCucumber

⚠️ Avoid Planting Near

OnionGarlicFennel

🤝

Full Companion Planting Guide for Green Bean

See which plants help Green Bean 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 Green Bean Varieties

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

Blue Lake 274

bush 55d

The most widely grown bush bean with round, stringless pods and excellent flavor.

Kentucky Wonder

pole 65d

Heirloom pole bean with meaty, flavorful pods; productive and reliable.

Dragon Tongue

bush 57d

Dutch heirloom with flat, yellow pods streaked purple; sweet and tender when young.

Romano

pole 70d

Wide, flat Italian pole bean with rich, full flavor; popular in Italian cooking.

Haricot Vert (Finaud)

filet 50d

Slender French filet bean; best harvested tiny at 4 inches for most tender texture.

Common Green Bean Problems

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

🐛

Pests

Bean Beetle (Mexican Bean Beetle)

Copper-colored, spotted beetle and yellow spiny larvae skeletonize leaves from the underside.

Fix:

Handpick adults and larvae; apply neem oil or pyrethrin; plant spined soldier bugs (a predator) nearby.

Aphids

Black bean aphid colonies cover stems and undersides of leaves; severe infestations stunt plants.

Fix:

Spray with insecticidal soap; knock off with water; avoid excess nitrogen fertilizer.

Bean Leaf Beetle

Red to tan beetle with variable black spots; chews round holes in leaves; transmits bean pod mottle virus.

Fix:

Row covers early season; pick off adults; pyrethrin for heavy infestations.

🍂

Diseases

Bean Rust

Small brown pustules on leaf undersides; leaves yellow and drop; spreads rapidly in humid weather.

Fix:

Avoid wetting foliage; apply sulfur fungicide; remove crop debris after harvest; rotate annually.

White Mold (Sclerotinia)

Cottony white growth on stems at and below the soil line; plants collapse and die.

Fix:

Improve airflow and drainage; avoid overhead irrigation; rotate beans to different beds annually.

Bacterial Brown Spot

Water-soaked spots on pods and leaves that turn brown with yellow halos.

Fix:

Use certified disease-free seed; avoid overhead irrigation; rotate crops.

💡

Common Mistakes

Planting in cool soil

Bean seeds rot in cold soil; germination is erratic below 60°F.

Fix:

Wait until soil is 60°F+ before planting; pre-warm soil with black plastic if needed.

Not picking regularly

Beans left on the plant to swell and mature signal the plant to stop producing.

Fix:

Harvest every 2–3 days to keep plants productive; even one overripe bean slows the whole plant.

Overwatering at germination

Bean seeds rot quickly in saturated soil before emergence.

Fix:

Keep soil moist but not saturated; water gently; do not mulch until plants are up and growing.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let pods dry completely on the vine — they'll turn tan/brown and rattle when shaken.

Processing

Shell dried pods, lay seeds on newspaper for 2 weeks before sealing in containers.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Bush beans are highly self-fertile. Isolate only if you want to keep multiple varieties perfectly pure.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 9 per sq ft of Green Bean. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Green Bean in Box Elder, Montana? +

In Box Elder (Zone 4a), direct sow Green Bean outdoors around Friday, April 3, 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 Green Bean take to grow? +

Green Bean typically matures in about 55 days from direct sowing. In Box Elder, that means you can expect harvest around Friday, April 3, 2026 plus 55 days.

Should I start Green Bean indoors or direct sow in Montana? +

Green Bean does best when direct sown outdoors. In Box Elder, sow directly around Friday, April 3, 2026.

📚 More Green Bean Planting Guides

🗺️

Green Bean in Montana

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4a Green Bean Guide

All cities in your zone · Avg dates

→

Other Plants for Box Elder

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 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 Green Bean in Zone 4a

Green Bean (Phaseolus vulgaris) is a popular garden vegetable. In Box Elder, Montana, which is in USDA Hardiness Zone 4a, you should direct sow seeds around Friday, April 3, 2026.

Your average last frost date is Friday, May 15, 2026. Green Bean grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.