When to plant Celery in Isleton, CA
In Zone 9b (Isleton), direct-sow Celery between January 22 and February 12 for spring, after the February 12 last-frost mark. A second sowing from October 6 to October 20 extends the harvest into fall.
When to Plant Celery in Isleton, CA
This month in Sacramento County, California
If you only do a handful of things in the garden this July, make it these. They're sequenced around your zone's frost timing.
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Basket week: celery
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Celery is a marshland plant that requires consistent moisture and cool temperatures to produce crisp, flavorful stalks. It is a rewarding but demanding garden crop.
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 Celery during the growing season.
Isleton Soil Profile
Soil Type
Loam
Soil pH
6.4-7.1
Drainage
Well Drained
Celery 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 Celery's growing requirements.
Soil pH
Your soil pH (6.4–7.1) overlaps with Celery's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in Sacramento County is excellent for Celery — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.4%). Annual compost additions will help Celery.
How to Plant Celery
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Celery
Sow every 9.1 weeks. Last sowing by Aug 03 to harvest before frost.
For a dedicated fall crop, sow by Oct 06.
Celery Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Celery
Celery needs approximately 1.3 inches of water per week (5.6" per month). Here's how your county's rainfall compares month by month.
| Month | Celery Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 6.1" | 0" | ❄️ Dormant |
| Feb | 5.6" | 7.5" | 0" | ✅ Rainfall sufficient |
| Mar | 5.6" | 5.7" | 0" | ✅ Rainfall sufficient |
| Apr | 5.6" | 2.5" | 3.1" | 🚿 Regular watering |
| May | 5.6" | 0.8" | 4.8" | 🚿 Regular watering |
| Jun | 5.6" | 0.2" | 5.4" | 🚿 Regular watering |
| Jul | 5.6" | 0" | 5.6" | 🚿 Regular watering |
| Aug | 5.6" | 0" | 5.6" | 🚿 Regular watering |
| Sep | 5.6" | 0.3" | 5.3" | 🚿 Regular watering |
| Oct | 5.6" | 1.4" | 4.2" | 🚿 Regular watering |
| Nov | 5.6" | 2.7" | 2.9" | 🚿 Regular watering |
| Dec | 5.6" | 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.
Celery 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.
Celery Planting Timeline — Isleton, CA
Celery 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 7 | May 7 – Jul 2 |
| 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
1.3"/week · 2-3 times/week
📅 Days to Maturity
80–120 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 9b
📆 Growing Season
292 days in Sacramento County
Growing Tips for Celery in Isleton
Direct sow Celery outdoors after February 12 in Sacramento County when soil has warmed and frost danger has passed.
Common pests for Celery in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 10-12 weeks before last frost. Keep soil consistently moist and never let it dry out. Blanch stalks by mounding soil or using collars for milder flavor.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Celery in Other Locations
When should I plant Celery in Isleton, CA?
In Isleton, CA, plant Celery 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, CA for Celery?
Isleton sits in USDA Zone 9b. Celery grows reliably in zones 2a through 10b, so it's a good fit here.
Can Celery grow in Isleton's climate?
Yes — Celery 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.