When to Plant Stevia in Coalmont, Colorado (80430)

Location

Coalmont, Colorado

ZIP Code

80430

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Tuesday, February 24, 2026

Transplant Outdoors

Tuesday, May 19, 2026

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

Pro tip: Start Stevia seeds indoors 10 weeks before your last frost date, then transplant outdoors around Tuesday, May 19, 2026.

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🌿 Plant Details

Scientific Name Stevia rebaudiana

Days to Maturity 90 days

Mature Height 18-24"

Spread 18"

Type Tender Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (consistent moisture)

↔️

Spacing

18" apart

🌱

Planting Depth

0.13" deep

Seeds typically germinate in 14-21 days

Ready to Plant Stevia in Coalmont?

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

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🤝 Good Companions

PepperTomatoBasil

⚠️ Avoid Planting Near

Fennel

🤝

Full Companion Planting Guide for Stevia

See which plants help Stevia 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

Harvest seed heads when brown and dry in fall, just before the first frost.

Processing

Strip dried flower heads, separate chaff, surface sow immediately or store cool and dry.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Stevia germination rates can be low (20–50%). Surface sow and provide light — seeds need light to germinate.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Stevia in Coalmont, Colorado? +

In Coalmont (Zone 4b), start Stevia seeds indoors around Tuesday, February 24, 2026 and transplant outdoors around Tuesday, May 19, 2026.

What is the last frost date for Coalmont, Colorado? +

The average last spring frost date for Coalmont, Colorado (ZIP 80430) is around Tuesday, May 5, 2026. This is based on NOAA climate normals for USDA Zone 4b.

How long does Stevia take to grow? +

Stevia typically matures in about 90 days from transplanting. In Coalmont, that means you can expect harvest around Tuesday, May 19, 2026 plus 90 days.

Should I start Stevia indoors or direct sow in Colorado? +

Stevia should be started indoors 10 weeks before your last frost date. In Coalmont, that means starting around Tuesday, February 24, 2026.

📚 More Stevia Planting Guides

🗺️

Stevia in Colorado

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4b Stevia Guide

All cities in your zone · Avg dates

→

Other Plants for Coalmont

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 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 Stevia in Zone 4b

Stevia (Stevia rebaudiana) is a popular garden vegetable. In Coalmont, Colorado, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, February 24, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Stevia seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.