When to Plant Kohlrabi in Hardin County, TX
May in Hardin County, Texas — your action list
May is a pivotal month for Hardin County, Texas gardens. Focus on these tasks first and you'll set up the rest of the season for success.
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Collect kohlrabi at their peak
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Kohlrabi is an unusual brassica that forms a swollen stem above ground with a mild, sweet turnip-like flavor. Both the bulb and tender leaves are edible.
Hardin County, Texas is in USDA Zone 9a. The average last spring frost is February 14 and the first fall frost is December 4, giving you a growing season of approximately 293 days.
At an elevation of 323 feet, Hardin County receives approximately 66.4 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 90°F, providing good warmth for Kohlrabi during the growing season. Sandy soil warms quickly in spring — great for early planting — but Kohlrabi will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Kohlrabi root diseases.
Hardin County Soil Profile
Soil Type
Sandy Loam
Soil pH
5.3-6.7
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 Hardin County
How your county's soil matches Kohlrabi's growing requirements.
Soil pH
Your soil pH (5.3–6.7) overlaps with Kohlrabi's range (6.0–7.5), though not a perfect match.
Soil Texture
Sandy soil in Hardin County warms quickly in spring but drains fast. Kohlrabi will need more frequent watering and regular compost additions to retain nutrients.
Organic Matter
Organic matter is low (1.7%). Add 2-3 inches of compost before planting Kohlrabi.
How to Plant Kohlrabi
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Kohlrabi
Sow every 5.1 weeks. Last sowing by Sep 30 to harvest before frost.
For a dedicated fall crop, sow by Oct 09.
Plant Water Budget
Monthly Watering Guide for Kohlrabi
Kohlrabi needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Kohlrabi Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | 3" | 2" | 1" | 💧 Light watering |
| Mar | 3" | 3.7" | 0" | ✅ Rainfall sufficient |
| Apr | 3" | 7.7" | 0" | ✅ Rainfall sufficient |
| May | 3" | 10.4" | 0" | ✅ Rainfall sufficient |
| Jun | 3" | 11.2" | 0" | ✅ Rainfall sufficient |
| Jul | 3" | 9.5" | 0" | ✅ Rainfall sufficient |
| Aug | 3" | 7.2" | 0" | ✅ Rainfall sufficient |
| Sep | 3" | 5.6" | 0" | ✅ Rainfall sufficient |
| Oct | 3" | 4.1" | 0" | ✅ Rainfall sufficient |
| Nov | 3" | 1.9" | 1.1" | 💧 Light watering |
| Dec | 3" | 1.6" | 1.4" | 💧 Light watering |
Water needs are for active growing months only (Feb–Dec in Hardin County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Kohlrabi 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.
Kohlrabi Planting Timeline — Hardin County, TX
Kohlrabi Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 17 | Jan 17 – Jan 31 |
| Transplant Outdoors | February 14 | Feb 14 – Feb 28 |
| Direct Sow | January 24 | Jan 24 – Feb 14 |
| Harvest | April 4 | Apr 4 – May 9 |
| Fall Sowing | October 9 | Oct 9 – Oct 23 |
Plant 0.5" deep · 4" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors Direct Sow |
| February | Transplant Outdoors Direct Sow |
| March | — |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.7"/week · Natural rainfall sufficient
📅 Days to Maturity
45–65 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 9a
📆 Growing Season
293 days in Hardin County
Growing Tips for Kohlrabi in Hardin County
Direct sow Kohlrabi outdoors after February 14 in Hardin County when soil has warmed and frost danger has passed.
Sandy soil in Hardin County dries quickly — mulch Kohlrabi with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
Your generous 294.0-day season in Hardin County allows multiple plantings of Kohlrabi. Sow every 22.0 days for continuous harvest.
Common pests for Kohlrabi in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in spring or fall. Harvest when bulbs are 2-3 inches in diameter for best texture and flavor. Larger bulbs may become woody and fibrous.
Companion Planting
Good Companions
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Kohlrabi in Other Locations
Frequently Asked Questions
When should I plant Kohlrabi in Hardin County, TX?
Hardin County is in Zone 9a with an average last frost of February 14. Plan your Kohlrabi planting based on this frost date — see the calendar above for exact timing.
What planting zone is Hardin County, TX?
Hardin County, Texas is in USDA Hardiness Zone 9a. The average last spring frost is February 14 and first fall frost is December 4.
Your Hardin County Garden Planner — Free
A 24-page printable planner built for Hardin County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.