When to plant Anise in Boulder County, CO
Aim to plant Anise in Boulder County on or after April 30; the window stays open through May 21. Boulder County's 135-day frost-free season gives you a single solid spring crop with a brief fall option. A second sowing from July 18 to August 1 extends the harvest into fall.
When to Plant Anise in Boulder County, CO
Top priorities for Boulder County, Colorado gardeners in August
We've pulled the most time-sensitive tasks for Boulder County, Colorado this August and put them front and centre. Tackle them in order.
-
Harvest anise as they ripen
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
September prep starts now
- First harvests: anise
Anise is an annual herb grown for its licorice-flavored seeds and leaves. The seeds are used in baking, liqueurs, and traditional medicine worldwide.
Boulder County, Colorado is in USDA Zone 6a. The average last spring frost is May 14 and the first fall frost is September 26, giving you a growing season of approximately 135 days.
At an elevation of 7,657 feet, Boulder County receives approximately 22.2 inches of rainfall annually with predominantly loam soil. Summer highs average 86°F, providing good warmth for Anise during the growing season.
Boulder County Soil Profile
Soil Type
Loam
Soil pH
6.7-8
Drainage
Well Drained
Anise Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Boulder County
How your county's soil matches Anise's growing requirements.
Soil pH
Your soil pH (6.7–8.0) overlaps with Anise's range (6.0–7.5), though not a perfect match.
Soil Texture
The loam soil in Boulder County is excellent for Anise — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Anise.
Organic Matter
Organic matter is moderate (2.3%). Annual compost additions will help Anise.
How to Plant Anise
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Anise Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Anise
Anise needs approximately 0.4 inches of water per week (1.7" per month). Here's how your county's rainfall compares month by month.
| Month | Anise Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.7" | 0" | ❄️ Dormant |
| Feb | — | 1.3" | 0" | ❄️ Dormant |
| Mar | — | 1.8" | 0" | ❄️ Dormant |
| Apr | — | 2.2" | 0" | ❄️ Dormant |
| May | 1.7" | 3" | 0" | ✅ Rainfall sufficient |
| Jun | 1.7" | 1.6" | 0.1" | 💧 Light watering |
| Jul | 1.7" | 2" | 0" | ✅ Rainfall sufficient |
| Aug | 1.7" | 2.1" | 0" | ✅ Rainfall sufficient |
| Sep | 1.7" | 2.1" | 0" | ✅ Rainfall sufficient |
| Oct | — | 1.9" | 0" | ❄️ Dormant |
| Nov | — | 1.4" | 0" | ❄️ Dormant |
| Dec | — | 1.2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Sep in Boulder County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Anise Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Anise Planting Timeline — Boulder County, CO
Anise Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | April 9 | Apr 9 – Apr 23 |
| Transplant Outdoors | May 7 | May 7 – May 21 |
| Direct Sow | April 30 | Apr 30 – May 21 |
| Harvest | August 6 | Aug 6 – Oct 22 |
| Fall Sowing | July 18 | Jul 18 – Aug 1 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Fall Sowing |
| August | Fall Sowing Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.4"/week · Natural rainfall sufficient
📅 Days to Maturity
90–120 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 6a
📆 Growing Season
135 days in Boulder County
Growing Tips for Anise in Boulder County
Direct sow Anise outdoors after May 14 in Boulder County when soil has warmed and frost danger has passed.
Common pests for Anise in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow after last frost as anise has a taproot. Harvest seeds when they turn brown. Plants may need staking. The feathery leaves are also edible with a mild anise flavor.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Anise in Other Locations
Frequently Asked Questions
When should I plant Anise in Boulder County, CO?
Boulder County is in Zone 6a with an average last frost of May 14. Plan your Anise planting based on this frost date — see the calendar above for exact timing.
What planting zone is Boulder County, CO?
Boulder County, Colorado is in USDA Hardiness Zone 6a. The average last spring frost is May 14 and first fall frost is September 26.
When should I plant Anise in Boulder County, CO?
In Boulder County, CO, plant Anise after the last frost (around May 14) and before the first frost (around September 26). Best results when soil holds above 50°F.
What growing zone is Boulder County, CO for Anise?
Boulder County sits in USDA Zone 6a. Anise grows reliably in zones 4a through 10b, so it's a good fit here.
Can Anise grow in Boulder County's climate?
Yes — Anise grows well in Boulder County's temperate climate. Boulder County averages a 135-day frost-free season, with last frost around May 14 and first frost around September 26.
Your Boulder County Garden Planner — Free
A 22-page printable planner built for Boulder County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.