When to Plant Fava Bean in Haiku, Hawaii (96708)

Location

Haiku, Hawaii

ZIP Code

96708

USDA Zone

12a

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 4, 2025

Based on last frost Thursday, January 1, 2026 · Zone 12a

Pro tip: Sow Fava Bean directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Vicia faba

Days to Maturity 85 days

Mature Height 24-48"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

6" apart

🌱

Planting Depth

2" deep

Seeds typically germinate in 7-14 days

Ready to Plant Fava Bean in Haiku?

Get your seeds now so they're ready by Thursday, December 4, 2025.

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🤝 Good Companions

CarrotPotatoBeetSpinach

⚠️ Avoid Planting Near

OnionGarlicFennel

🤝

Full Companion Planting Guide for Fava Bean

See which plants help Fava 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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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow pods to dry completely on the plant and turn black.

Processing

Shell dried pods, cure seeds on a screen for 2 weeks, then store in a cool dry place.

Seed Viability

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

Pro Tip

Fava beans can cross-pollinate via insects — isolate by 300 feet from other fava varieties to keep pure.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Fava Bean in Haiku, Hawaii? +

In Haiku (Zone 12a), direct sow Fava Bean outdoors around Thursday, December 4, 2025.

What is the last frost date for Haiku, Hawaii? +

The average last spring frost date for Haiku, Hawaii (ZIP 96708) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12a.

How long does Fava Bean take to grow? +

Fava Bean typically matures in about 85 days from direct sowing. In Haiku, that means you can expect harvest around Thursday, December 4, 2025 plus 85 days.

Should I start Fava Bean indoors or direct sow in Hawaii? +

Fava Bean does best when direct sown outdoors. In Haiku, sow directly around Thursday, December 4, 2025.

📚 More Fava Bean Planting Guides

🗺️

Fava Bean in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12a Fava Bean Guide

All cities in your zone · Avg dates

→

Other Plants for Haiku

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 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 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 Fava Bean in Zone 12a

Fava Bean (Vicia faba) is a popular garden vegetable. In Haiku, Hawaii, which is in USDA Hardiness Zone 12a, you should direct sow seeds around Thursday, December 4, 2025.

Your average last frost date is Thursday, January 1, 2026. Fava Bean grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.