When to Plant Cauliflower in Jefferson Parish, LA
Your May game plan for Jefferson Parish, Louisiana
A quick May briefing for Jefferson Parish, Louisiana gardeners — what's urgent, what's next, and what can wait.
-
Bring in the cauliflower
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Cauliflower is a cool-season brassica that produces dense white, purple, or green heads called curds. It is more finicky than broccoli but rewards with a mild, nutty flavor.
Jefferson Parish, Louisiana is in USDA Zone 9b. The average last spring frost is January 27 and the first fall frost is December 18, giving you a growing season of approximately 325 days.
At an elevation of 314 feet, Jefferson Parish receives approximately 55.2 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 100°F, so Cauliflower may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Cauliflower will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Cauliflower root diseases.
Jefferson Parish Soil Profile
Soil Type
Sandy Loam
Soil pH
5-6.1
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 Jefferson Parish
How your county's soil matches Cauliflower's growing requirements.
Soil pH
Your soil pH (5.0–6.1) is more acidic than Cauliflower prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in Jefferson Parish warms quickly in spring but drains fast. Cauliflower will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Cauliflower.
Organic Matter
Organic matter is low (1.7%). Add 2-3 inches of compost before planting Cauliflower.
How to Plant Cauliflower
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Cauliflower
Sow every 6.3 weeks. Last sowing by Sep 09 to harvest before frost.
For a dedicated fall crop, sow by Oct 23.
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Cauliflower
Cauliflower needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Cauliflower Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Feb | 4.3" | 4.4" | 0" | ✅ Rainfall sufficient |
| Mar | 4.3" | 4.8" | 0" | ✅ Rainfall sufficient |
| Apr | 4.3" | 4.4" | 0" | ✅ Rainfall sufficient |
| May | 4.3" | 4.1" | 0.2" | 💧 Light watering |
| Jun | 4.3" | 5.7" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 5.9" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 5.2" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 3.6" | 0.7" | 💧 Light watering |
| Oct | 4.3" | 3.7" | 0.6" | 💧 Light watering |
| Nov | 4.3" | 4.8" | 0" | ✅ Rainfall sufficient |
| Dec | 4.3" | 3.9" | 0.4" | 💧 Light watering |
Water needs are for active growing months only (Jan–Dec in Jefferson Parish). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Cauliflower 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.
Cauliflower Planting Timeline — Jefferson Parish, LA
Cauliflower Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 30 | Dec 30 – Jan 13 |
| Transplant Outdoors | January 27 | Jan 27 – Feb 10 |
| Direct Sow | January 6 | Jan 6 – Jan 27 |
| Harvest | March 24 | Mar 24 – May 26 |
| Fall Sowing | October 23 | Oct 23 – Nov 6 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors Transplant Outdoors Direct Sow |
| February | Transplant Outdoors |
| March | Harvest |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Fall Sowing |
| December | Start Indoors |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
55–100 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9b
📆 Growing Season
325 days in Jefferson Parish
Growing Tips for Cauliflower in Jefferson Parish
Direct sow Cauliflower outdoors after January 27 in Jefferson Parish when soil has warmed and frost danger has passed.
Sandy soil in Jefferson Parish dries quickly — mulch Cauliflower with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
Summer highs in Jefferson Parish reach 100°F — grow Cauliflower as a spring or fall crop. Use shade cloth if planting in summer.
Common pests for Cauliflower in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6 weeks before transplanting. Blanch white varieties by tying outer leaves over the head. Provide consistent moisture and avoid temperature extremes.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Cauliflower in Other Locations
Frequently Asked Questions
When should I plant Cauliflower in Jefferson Parish, LA?
Jefferson Parish is in Zone 9b with an average last frost of January 27. Plan your Cauliflower planting based on this frost date — see the calendar above for exact timing.
What planting zone is Jefferson Parish, LA?
Jefferson Parish, Louisiana is in USDA Hardiness Zone 9b. The average last spring frost is January 27 and first fall frost is December 18.
Your Jefferson Parish Garden Planner — Free
A 24-page printable planner built for Jefferson Parish (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.