When to Plant Butternut Squash in Gilroy, California (95021)

Location

Gilroy, California

ZIP Code

95021

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Tuesday, January 13, 2026

Transplant Outdoors

Tuesday, February 24, 2026

Based on last frost Tuesday, February 10, 2026 · Zone 9b

Pro tip: Start Butternut Squash seeds indoors 4 weeks before your last frost date, then transplant outdoors around Tuesday, February 24, 2026.

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🌿 Plant Details

Scientific Name Cucurbita moschata

Days to Maturity 100 days

Mature Height 12-18"

Spread 72"

Type Vine

Fruit Size Large (2-5 lbs)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1 inch/week)

↔️

Spacing

60" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 5-10 days

Ready to Plant Butternut Squash in Gilroy?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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🤝 Good Companions

CornBeanMarigoldNasturtium

⚠️ Avoid Planting Near

Potato

🤝

Full Companion Planting Guide for Butternut Squash

See which plants help Butternut Squash 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

Cure squash for 4–6 weeks after harvest before extracting seeds — curing improves seed viability.

Processing

Scoop seeds from cured squash, rinse off stringy flesh, spread to dry for 2 weeks.

Seed Viability

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

Pro Tip

Butternut is C. moschata — crosses with other moschata varieties but generally not with C. pepo squashes.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 1 plant of Butternut Squash. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Butternut Squash in Gilroy, California? +

In Gilroy (Zone 9b), start Butternut Squash seeds indoors around Tuesday, January 13, 2026 and transplant outdoors around Tuesday, February 24, 2026.

What is the last frost date for Gilroy, California? +

The average last spring frost date for Gilroy, California (ZIP 95021) is around Tuesday, February 10, 2026. This is based on NOAA climate normals for USDA Zone 9b.

How long does Butternut Squash take to grow? +

Butternut Squash typically matures in about 100 days from transplanting. In Gilroy, that means you can expect harvest around Tuesday, February 24, 2026 plus 100 days.

Should I start Butternut Squash indoors or direct sow in California? +

Butternut Squash should be started indoors 4 weeks before your last frost date. In Gilroy, that means starting around Tuesday, January 13, 2026.

📚 More Butternut Squash Planting Guides

🗺️

Butternut Squash in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9b Butternut Squash Guide

All cities in your zone · Avg dates

→

Other Plants for Gilroy

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 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 Butternut Squash in Zone 9b

Butternut Squash (Cucurbita moschata) is a popular garden vegetable. In Gilroy, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Butternut Squash seedlings outdoors around Tuesday, February 24, 2026, about 2 weeks after your last frost date.