When to Plant Kohlrabi in Hardin County, OH
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, Ohio is in USDA Zone 5b. The average last spring frost is April 26 and the first fall frost is October 20, giving you a growing season of approximately 177 days.
At an elevation of 935 feet, Hardin County receives approximately 30.4 inches of rainfall annually with predominantly silt loam soil. Summer highs average 85°F, providing good warmth for Kohlrabi during the growing season.
Hardin County Soil Profile
Soil Type
Silt Loam
Soil pH
6.3-6.8
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.
Plant Water Budget
Kohlrabi Planting Timeline — Hardin County, OH
Kohlrabi Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 22 | Mar 22 – Apr 5 |
| Transplant Outdoors | April 26 | Apr 26 – May 10 |
| Direct Sow | April 12 | Apr 12 – May 3 |
| Fall Sowing | August 11 | Aug 11 – Aug 25 |
| Harvest | June 14 | Jun 14 – Jul 19 |
Plant 0.5" deep · 4" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Harvest |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
45–65 days
Soil pH
6 – 7.5
USDA Zone
Zone 5b
Growing Season
177 days
Growing Tips for Hardin County
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
Avoid Planting Near
Level Up Your Garden
Kohlrabi in Other Locations
Frequently Asked Questions
When should I plant Kohlrabi in Hardin County, OH?
Hardin County is in Zone 5b with an average last frost of April 26. Plan your Kohlrabi planting based on this frost date — see the calendar above for exact timing.
What planting zone is Hardin County, OH?
Hardin County, Ohio is in USDA Hardiness Zone 5b. The average last spring frost is April 26 and first fall frost is October 20.
Plan Your Garden with Confidence
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