When to Plant Garlic Chives in Costilla County, CO
May to-do list for Costilla County, Colorado
Your garden in Costilla County, Colorado is working on a schedule, even when you're not. Here's where you should be this May.
June will be here before you know it — start on
- Transplants going out: garlic chives
Garlic chives are a perennial herb with flat leaves that have a mild garlic flavor. They produce attractive white flower clusters and are used in Asian cooking.
Costilla County, Colorado is in USDA Zone 5b. The average last spring frost is June 8 and the first fall frost is September 16, giving you a growing season of approximately 100 days.
At an elevation of 5,598 feet, Costilla County receives approximately 21 inches of rainfall annually with predominantly loam soil. Summer highs average 86°F, providing good warmth for Garlic Chives during the growing season.
Costilla County Soil Profile
Soil Type
Loam
Soil pH
6.2-8.3
Drainage
Well Drained
Plant 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 Costilla County
How your county's soil matches Garlic Chives's growing requirements.
Soil pH
Your soil pH (6.2–8.3) overlaps with Garlic Chives's range (6.0–7.5), though not a perfect match.
Soil Texture
The loam soil in Costilla County is excellent for Garlic Chives — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Garlic Chives.
Organic Matter
Organic matter is moderate (2.5%). Annual compost additions will help Garlic Chives.
How to Plant Garlic Chives
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Garlic Chives
Garlic Chives needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Garlic Chives Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.3" | 0" | ❄️ Dormant |
| Mar | — | 1.9" | 0" | ❄️ Dormant |
| Apr | — | 2" | 0" | ❄️ Dormant |
| May | — | 2.5" | 0" | ❄️ Dormant |
| Jun | 2.2" | 1.3" | 0.9" | 💧 Light watering |
| Jul | 2.2" | 2" | 0.2" | 💧 Light watering |
| Aug | 2.2" | 2.5" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 1.7" | 0.5" | 💧 Light watering |
| Oct | — | 1.9" | 0" | ❄️ Dormant |
| Nov | — | 1.3" | 0" | ❄️ Dormant |
| Dec | — | 1.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Jun–Sep in Costilla County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Garlic Chives 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.
Garlic Chives Planting Timeline — Costilla County, CO
Garlic Chives Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | June 15 | Jun 15 – Jun 29 |
| Harvest | August 17 | Aug 17 – Oct 26 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | Transplant Outdoors |
| July | — |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 5b
📆 Growing Season
100 days in Costilla County
Growing Tips for Garlic Chives in Costilla County
Direct sow Garlic Chives outdoors after June 08 in Costilla County when soil has warmed and frost danger has passed.
Your 100.0-day growing season in Costilla County is tight for Garlic Chives (60.0-90.0 days to maturity). Start indoors and choose early-maturing varieties.
Common pests for Garlic Chives in this region include onion maggots and thrips. Use row covers early in the season and inspect plants weekly.
Costilla County receives only 21" of rain annually. Garlic Chives needs consistent moisture — install drip irrigation or water deeply 2-3 times per week.
General growing tips
Start from seed or divisions. Cut flower stalks before seeds set to prevent aggressive self-seeding. Both leaves and flower buds are edible and flavorful.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Garlic Chives in Other Locations
Frequently Asked Questions
When should I plant Garlic Chives in Costilla County, CO?
Costilla County is in Zone 5b with an average last frost of June 8. Plan your Garlic Chives planting based on this frost date — see the calendar above for exact timing.
What planting zone is Costilla County, CO?
Costilla County, Colorado is in USDA Hardiness Zone 5b. The average last spring frost is June 8 and first fall frost is September 16.
Your Costilla County Garden Planner — Free
A 24-page printable planner built for Costilla County (Zone 5b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.