When to plant Arugula in Knox County, IN
For Arugula in Knox County, the safe spring window opens around March 27 and closes around April 17. Last expected frost is April 10, first fall frost October 23, giving a 196-day growing season. A second sowing from August 14 to August 28 extends the harvest into fall.
When to Plant Arugula in Knox County, IN
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.
Knox County, Indiana is in USDA Zone 6b. The average last spring frost is April 10 and the first fall frost is October 23, giving you a growing season of approximately 196 days.
At an elevation of 735 feet, Knox County receives approximately 38.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Arugula during the growing season.
Knox County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Arugula Planting Timeline — Knox County, IN
Arugula Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 6 | Mar 6 – Mar 20 |
| Transplant Outdoors | April 10 | Apr 10 – Apr 24 |
| Direct Sow | March 27 | Mar 27 – Apr 17 |
| Harvest | May 15 | May 15 – Jul 17 |
| Fall Sowing | August 14 | Aug 14 – Aug 28 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
30–50 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6b
📆 Growing Season
196 days in Knox County
Growing Tips for Knox County
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
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Arugula in Other Locations
Frequently Asked Questions
When should I plant Arugula in Knox County, IN?
Knox County is in Zone 6b with an average last frost of April 10. Plan your Arugula planting based on this frost date — see the calendar above for exact timing.
What planting zone is Knox County, IN?
Knox County, Indiana is in USDA Hardiness Zone 6b. The average last spring frost is April 10 and first fall frost is October 23.
When should I plant Arugula in Knox County, IN?
In Knox County, IN, plant Arugula after the last frost (around April 10) and before the first frost (around October 23). Best results when soil holds above 50°F.
What growing zone is Knox County, IN for Arugula?
Knox County sits in USDA Zone 6b. Arugula grows reliably in zones 3a through 11b, so it's a good fit here.
Can Arugula grow in Knox County's climate?
Yes — Arugula grows well in Knox County's temperate climate. Knox County averages a 196-day frost-free season, with last frost around April 10 and first frost around October 23.
Your Knox County Garden Planner — Free
A 22-page printable planner built for Knox County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.