When to Plant Chives in Santa Clara County, CA
May in Santa Clara County, California — your action list
May is a pivotal month for Santa Clara County, California gardens. Focus on these tasks first and you'll set up the rest of the season for success.
-
Collect chives at their peak
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Before June arrives, get these ready
- First harvests: chives
Chives are a hardy perennial herb with a mild onion flavor and attractive purple pom-pom flowers. They are one of the easiest herbs to grow and maintain.
Santa Clara County, California is in USDA Zone 9b. The average last spring frost is February 19 and the first fall frost is December 3, giving you a growing season of approximately 287 days.
At an elevation of 455 feet, Santa Clara County receives approximately 15.5 inches of rainfall annually with predominantly loam soil. Summer highs average 92°F, providing good warmth for Chives during the growing season. With low rainfall, drip irrigation is essential for growing Chives successfully. Mulch heavily to conserve soil moisture.
Santa Clara County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.8
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 Santa Clara County
How your county's soil matches Chives's growing requirements.
Soil pH
Your soil pH (6.7–7.8) is more alkaline than Chives prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
The loam soil in Santa Clara County is excellent for Chives — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.6%). Annual compost additions will help Chives.
How to Plant Chives
Succession Planting Chives
Sow every 6.9 weeks. Last sowing by Sep 04 to harvest before frost.
Plant Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Chives
Chives 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 | Chives Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 3.2" | 0" | ❄️ Dormant |
| Feb | 1.7" | 3.6" | 0" | ✅ Rainfall sufficient |
| Mar | 1.7" | 2.6" | 0" | ✅ Rainfall sufficient |
| Apr | 1.7" | 1.1" | 0.6" | 💧 Light watering |
| May | 1.7" | 0.3" | 1.4" | 🚿 Regular watering |
| Jun | 1.7" | 0.1" | 1.6" | 🚿 Regular watering |
| Jul | 1.7" | 0" | 1.7" | 🚿 Regular watering |
| Aug | 1.7" | 0" | 1.7" | 🚿 Regular watering |
| Sep | 1.7" | 0.1" | 1.6" | 🚿 Regular watering |
| Oct | 1.7" | 0.6" | 1.1" | 🚿 Regular watering |
| Nov | 1.7" | 1.4" | 0.3" | 💧 Light watering |
| Dec | 1.7" | 2.6" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Feb–Dec in Santa Clara County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
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.
Chives Planting Timeline — Santa Clara County, CA
Chives Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | February 26 | Feb 26 – Mar 12 |
| Harvest | April 30 | Apr 30 – Jul 9 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Transplant Outdoors |
| March | Transplant Outdoors |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.4"/week · Only during dry spells
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 9b
📆 Growing Season
287 days in Santa Clara County
Growing Tips for Chives in Santa Clara County
Direct sow Chives outdoors after February 19 in Santa Clara County when soil has warmed and frost danger has passed.
Common pests for Chives in this region include onion maggots and thrips. Use row covers early in the season and inspect plants weekly.
General growing tips
Start from seed or divisions in spring. Cut back to 2 inches after flowering to encourage fresh growth. Both the leaves and flowers are edible and delicious.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Chives in Other Locations
Frequently Asked Questions
When should I plant Chives in Santa Clara County, CA?
Santa Clara County is in Zone 9b with an average last frost of February 19. Plan your Chives planting based on this frost date — see the calendar above for exact timing.
What planting zone is Santa Clara County, CA?
Santa Clara County, California is in USDA Hardiness Zone 9b. The average last spring frost is February 19 and first fall frost is December 3.
Your Santa Clara County Garden Planner — Free
A 24-page printable planner built for Santa Clara County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.