When to plant Leeks in Isleton,
Plant Leeks in Isleton from January 22 to February 12 in spring. Isleton sits in USDA Zone 9b, with last frost around February 12 and first frost on December 1. A second sowing from October 6 to October 20 extends the harvest into fall.
When to Plant Leeks in Isleton, CA
What to do in June
Your Sacramento County, California garden is entering a new phase. Here's what's on the schedule for June and why each task matters now.
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Harvest leeks as they ripen
Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.
Before July arrives, get these ready
- First harvests: leeks
Leeks are a mild, sweet allium that produces long white shanks. They are more refined than onions and are a key ingredient in soups, stews, and gratins.
Isleton, California is in USDA Zone 9b. The average last spring frost is February 12 and the first fall frost is December 1, giving you a growing season of approximately 292 days.
At an elevation of 263 feet, Sacramento County receives approximately 33.2 inches of rainfall annually with predominantly loam soil. Summer highs average 90°F, providing good warmth for Leeks during the growing season.
Isleton Soil Profile
Soil Type
Loam
Soil pH
6.4-7.1
Drainage
Well Drained
Leeks 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 Isleton
How your county's soil matches Leeks's growing requirements.
Soil pH
Your soil pH (6.4–7.1) overlaps with Leeks's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in Sacramento County is excellent for Leeks — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.4%). Annual compost additions will help Leeks.
How to Plant Leeks
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Leeks Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Leeks
Leeks needs approximately 0.8 inches of water per week (3.5" per month). Here's how your county's rainfall compares month by month.
| Month | Leeks Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 6.1" | 0" | ❄️ Dormant |
| Feb | 3.5" | 7.5" | 0" | ✅ Rainfall sufficient |
| Mar | 3.5" | 5.7" | 0" | ✅ Rainfall sufficient |
| Apr | 3.5" | 2.5" | 1" | 💧 Light watering |
| May | 3.5" | 0.8" | 2.7" | 🚿 Regular watering |
| Jun | 3.5" | 0.2" | 3.3" | 🚿 Regular watering |
| Jul | 3.5" | 0" | 3.5" | 🚿 Regular watering |
| Aug | 3.5" | 0" | 3.5" | 🚿 Regular watering |
| Sep | 3.5" | 0.3" | 3.2" | 🚿 Regular watering |
| Oct | 3.5" | 1.4" | 2.1" | 🚿 Regular watering |
| Nov | 3.5" | 2.7" | 0.8" | 💧 Light watering |
| Dec | 3.5" | 5.9" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Feb–Dec in Sacramento County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Leeks 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.
Leeks Planting Timeline — Isleton, CA
Leeks Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 15 | Jan 15 – Jan 29 |
| Transplant Outdoors | February 12 | Feb 12 – Feb 26 |
| Direct Sow | January 22 | Jan 22 – Feb 12 |
| Harvest | May 14 | May 14 – Jul 30 |
| Fall Sowing | October 6 | Oct 6 – Oct 20 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors Direct Sow |
| February | Transplant Outdoors Direct Sow |
| March | — |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.8"/week · 1-2 times/week
📅 Days to Maturity
90–150 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 9b
📆 Growing Season
292 days in Sacramento County
Growing Tips for Leeks in Isleton
Direct sow Leeks outdoors after February 12 in Sacramento County when soil has warmed and frost danger has passed.
Common pests for Leeks in this region include onion maggots and thrips. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 10-12 weeks before last frost. Transplant into trenches and hill soil around stems as they grow to increase the white portion. Harvest as needed.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Leeks in Other Locations
When should I plant Leeks in Isleton, ?
In Isleton, , plant Leeks after the last frost (around February 12) and before the first frost (around December 1). Best results when soil holds above 50°F.
What growing zone is Isleton, for Leeks?
Isleton sits in USDA Zone 9b. Leeks grows reliably in zones 3a through 10b, so it's a good fit here.
Can Leeks grow in Isleton's climate?
Yes — Leeks grows well in Isleton's temperate climate. Isleton averages a 293-day frost-free season, with last frost around February 12 and first frost around December 1.
Your Sacramento County Garden Planner — Free
A 22-page printable planner built for Sacramento 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.