When to Plant Arugula in Frio County, TX
Arugula is a fast-growing cool-season green with a peppery, nutty flavor. It is excellent in salads and can be harvested as baby greens or mature leaves.
Frio County, Texas is in USDA Zone 8b. The average last spring frost is February 26 and the first fall frost is November 26, giving you a growing season of approximately 273 days.
At an elevation of 3,892 feet, Frio County receives approximately 51 inches of rainfall annually with predominantly loam soil. Summer highs average 93°F, providing good warmth for Arugula during the growing season. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Arugula root diseases.
Frio County Soil Profile
Soil Type
Loam
Soil pH
6.4-7.2
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 Frio County
How your county's soil matches Arugula's growing requirements.
Soil pH
Your soil pH (6.4–7.2) overlaps with Arugula's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in Frio County is excellent for Arugula — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Arugula.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Arugula.
How to Plant Arugula
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Arugula
Sow every 3.4 weeks. Last sowing by Oct 07 to harvest before frost.
For a dedicated fall crop, sow by Sep 17.
Plant Water Budget
Monthly Watering Guide for Arugula
Arugula needs approximately 0.6 inches of water per week (2.6" per month). Here's how your county's rainfall compares month by month.
| Month | Arugula Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.2" | 0" | ❄️ Dormant |
| Feb | 2.6" | 1.9" | 0.7" | 💧 Light watering |
| Mar | 2.6" | 3.6" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 4.9" | 0" | ✅ Rainfall sufficient |
| May | 2.6" | 7.5" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 9.4" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 6.3" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 5.2" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 4.6" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 3.4" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 1.6" | 1" | 💧 Light watering |
| Dec | — | 1.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Feb–Nov in Frio County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Arugula 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.
Arugula Planting Timeline — Frio County, TX
Arugula Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 22 | Jan 22 – Feb 5 |
| Transplant Outdoors | February 26 | Feb 26 – Mar 12 |
| Direct Sow | February 12 | Feb 12 – Mar 5 |
| Harvest | April 2 | Apr 2 – Jun 4 |
| Fall Sowing | September 17 | Sep 17 – Oct 1 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors Transplant Outdoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | — |
| August | — |
| September | Fall Sowing |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.6"/week · Natural rainfall sufficient
📅 Days to Maturity
30–50 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 8b
📆 Growing Season
273 days in Frio County
Growing Tips for Arugula in Frio County
Direct sow Arugula outdoors after February 26 in Frio County when soil has warmed and frost danger has passed.
Summer highs in Frio County reach 93°F — grow Arugula as a spring or fall crop. Use shade cloth if planting in summer.
Your generous 274.0-day season in Frio County allows multiple plantings of Arugula. Sow every 15.0 days for continuous harvest.
Common pests for Arugula in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Sow seeds directly every 2-3 weeks for continuous harvest. Provide afternoon shade in warm weather to prevent bolting. Harvest outer leaves first to extend production.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Arugula in Other Locations
Frequently Asked Questions
When should I plant Arugula in Frio County, TX?
Frio County is in Zone 8b with an average last frost of February 26. Plan your Arugula planting based on this frost date — see the calendar above for exact timing.
What planting zone is Frio County, TX?
Frio County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is February 26 and first fall frost is November 26.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Frio County gardeners in Zone 8b organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.