When to Plant Jicama in Gregg County, TX
Jicama is a tropical legume grown for its crisp, sweet, starchy root. It requires a very long, warm growing season but produces a refreshing, water chestnut-like tuber.
Gregg County, Texas is in USDA Zone 8a. The average last spring frost is March 9 and the first fall frost is November 17, giving you a growing season of approximately 253 days.
At an elevation of 337 feet, Gregg County receives approximately 74.3 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 96°F, so Jicama may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Jicama will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Jicama root diseases.
Gregg County Soil Profile
Soil Type
Sandy Loam
Soil pH
5.5-6.3
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 Gregg County
How your county's soil matches Jicama's growing requirements.
Soil pH
Your soil pH (5.5–6.3) is more acidic than Jicama prefers (6.0–7.5). Add garden lime to raise pH.
Soil Texture
Sandy soil in Gregg County warms quickly in spring but drains fast. Jicama will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Jicama.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Jicama.
How to Plant Jicama
Plant Water Budget
Monthly Watering Guide for Jicama
Jicama needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Jicama Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.9" | 0" | ❄️ Dormant |
| Feb | — | 2.8" | 0" | ❄️ Dormant |
| Mar | 4.3" | 4.8" | 0" | ✅ Rainfall sufficient |
| Apr | 4.3" | 6.7" | 0" | ✅ Rainfall sufficient |
| May | 4.3" | 11.1" | 0" | ✅ Rainfall sufficient |
| Jun | 4.3" | 13" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 9.4" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 8.8" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 6.7" | 0" | ✅ Rainfall sufficient |
| Oct | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Nov | 4.3" | 2.8" | 1.5" | 💧 Light watering |
| Dec | — | 1.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Gregg County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Jicama 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.
Jicama Planting Timeline — Gregg County, TX
Jicama Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 19 | Jan 19 – Feb 2 |
| Transplant Outdoors | March 23 | Mar 23 – Apr 6 |
| Direct Sow | March 16 | Mar 16 – Apr 6 |
| Harvest | July 27 | Jul 27 – Oct 5 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors |
| March | Transplant Outdoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Only during dry spells
📅 Days to Maturity
120–180 days
🧪 Soil pH
Needs 6–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 8a
📆 Growing Season
253 days in Gregg County
Growing Tips for Jicama in Gregg County
Direct sow Jicama outdoors after March 09 in Gregg County when soil has warmed and frost danger has passed.
Sandy soil in Gregg County dries quickly — mulch Jicama with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 96°F in Gregg County, provide afternoon shade for Jicama and water deeply in the morning.
Common pests for Jicama in this region include bean beetles and aphids. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 8-10 weeks before last frost. Pinch off flowers to direct energy to root development. Harvest before first frost when roots are 3-6 inches across.
Companion Planting
Good Companions
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Check more plant combinations with our Companion Planting Checker →
Jicama in Other Locations
Frequently Asked Questions
When should I plant Jicama in Gregg County, TX?
Gregg County is in Zone 8a with an average last frost of March 9. Plan your Jicama planting based on this frost date — see the calendar above for exact timing.
What planting zone is Gregg County, TX?
Gregg County, Texas is in USDA Hardiness Zone 8a. The average last spring frost is March 9 and first fall frost is November 17.
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