When to Plant Anise in Boulder, Colorado (80310)

Location

Boulder, Colorado

ZIP Code

80310

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Monday, May 4, 2026

Based on last frost Monday, April 20, 2026 · Zone 6a

Pro tip: Sow Anise directly outdoors 2 weeks after your last frost date — it needs warm soil.

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🌿 Plant Details

Scientific Name Pimpinella anisum

Days to Maturity 75 days

Mature Height 18-24"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Anise in Boulder?

Get your seeds now so they're ready by Monday, May 4, 2026.

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🤝 Good Companions

CorianderCarrot

⚠️ Avoid Planting Near

FennelDillCaraway

🤝

Full Companion Planting Guide for Anise

See which plants help Anise 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

Harvest seed heads when gray-green to light brown, before they fully dry and shatter.

Processing

Cut seed heads into paper bag, hang dry for 1–2 weeks, then thresh gently.

Seed Viability

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

Pro Tip

Anise seeds are also a culinary spice — you can save the same seeds you'd use for cooking.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Anise. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Anise in Boulder, Colorado? +

In Boulder (Zone 6a), direct sow Anise outdoors around Monday, May 4, 2026.

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

The average last spring frost date for Boulder, Colorado (ZIP 80310) is around Monday, April 20, 2026. This is based on NOAA climate normals for USDA Zone 6a.

How long does Anise take to grow? +

Anise typically matures in about 75 days from direct sowing. In Boulder, that means you can expect harvest around Monday, May 4, 2026 plus 75 days.

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

Anise does best when direct sown outdoors. In Boulder, sow directly around Monday, May 4, 2026.

📚 More Anise Planting Guides

🗺️

Anise in Colorado

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6a Anise Guide

All cities in your zone · Avg dates

→

Other Plants for Boulder

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Growing Anise in Zone 6a

Anise (Pimpinella anisum) is a popular garden vegetable. In Boulder, Colorado, which is in USDA Hardiness Zone 6a, you should direct sow seeds around Monday, May 4, 2026.

Your average last frost date is Monday, April 20, 2026. Anise grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.