When to Plant Tomatillo in Karnes County, TX
Tomatillos are a Mexican staple that produces tart, green fruits enclosed in papery husks. They are essential for salsa verde and green sauces.
Karnes County, Texas is in USDA Zone 8b. The average last spring frost is February 26 and the first fall frost is November 30, giving you a growing season of approximately 277 days.
At an elevation of 4,532 feet, Karnes County receives approximately 67.2 inches of rainfall annually with predominantly loam soil. Summer highs average 95°F, so Tomatillo may need afternoon shade and extra watering during peak heat. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Tomatillo root diseases.
Karnes County Soil Profile
Soil Type
Loam
Soil pH
6.3-7.8
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 Karnes County
How your county's soil matches Tomatillo's growing requirements.
Soil pH
Your soil pH (6.3–7.8) is more alkaline than Tomatillo prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
The loam soil in Karnes County is excellent for Tomatillo — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Tomatillo.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Tomatillo.
How to Plant Tomatillo
Succession Planting Tomatillo
Sow every 6.9 weeks. Last sowing by Sep 06 to harvest before frost.
Plant Water Budget
Monthly Watering Guide for Tomatillo
Tomatillo needs approximately 1.1 inches of water per week (4.8" per month). Here's how your county's rainfall compares month by month.
| Month | Tomatillo Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.6" | 0" | ❄️ Dormant |
| Feb | 4.8" | 2.6" | 2.2" | 💧 Light watering |
| Mar | 4.8" | 4.6" | 0.2" | 💧 Light watering |
| Apr | 4.8" | 6.3" | 0" | ✅ Rainfall sufficient |
| May | 4.8" | 8.6" | 0" | ✅ Rainfall sufficient |
| Jun | 4.8" | 11.7" | 0" | ✅ Rainfall sufficient |
| Jul | 4.8" | 9.1" | 0" | ✅ Rainfall sufficient |
| Aug | 4.8" | 8.7" | 0" | ✅ Rainfall sufficient |
| Sep | 4.8" | 6.7" | 0" | ✅ Rainfall sufficient |
| Oct | 4.8" | 3.9" | 0.9" | 💧 Light watering |
| Nov | 4.8" | 2" | 2.8" | 🚿 Regular watering |
| Dec | — | 1.5" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Feb–Nov in Karnes County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Tomatillo 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.
Tomatillo Planting Timeline — Karnes County, TX
Tomatillo Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 8 | Jan 8 – Jan 22 |
| Transplant Outdoors | March 12 | Mar 12 – Mar 26 |
| Direct Sow | March 5 | Mar 5 – Mar 26 |
| Harvest | May 14 | May 14 – Jul 23 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | — |
| March | Transplant Outdoors Direct Sow |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.1"/week · 1-2 times/week
📅 Days to Maturity
60–85 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 8b
📆 Growing Season
277 days in Karnes County
Growing Tips for Tomatillo in Karnes County
Direct sow Tomatillo outdoors after February 26 in Karnes County when soil has warmed and frost danger has passed.
Common pests for Tomatillo in this region include tomato hornworm and aphids. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6-8 weeks before last frost. Plant at least two plants for cross-pollination. Harvest when fruits fill the husk and it begins to split.
Companion Planting
Good Companions
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Tomatillo in Other Locations
Frequently Asked Questions
When should I plant Tomatillo in Karnes County, TX?
Karnes County is in Zone 8b with an average last frost of February 26. Plan your Tomatillo planting based on this frost date — see the calendar above for exact timing.
What planting zone is Karnes County, TX?
Karnes County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is February 26 and first fall frost is November 30.
Plan Your Garden with Confidence
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