When to plant Cosmos in Jackson County, IN
Cosmos planted in Jackson County between April 12 and May 3 matures in 60–90 days — well before the October 20 first frost.
When to Plant Cosmos in Jackson County, IN
Cosmos (Cosmos bipinnatus) is an airy, feathery-foliaged cottage garden annual from Mexico that thrives on neglect. It produces delicate daisy-like blooms in shades of pink, white, and magenta from midsummer until frost. Cosmos is a prolific self-sower — once established in a garden it often returns year after year without replanting. Excellent habitat plant for beneficial insects.
Jackson County, Indiana is in USDA Zone 6b. The average last spring frost is April 12 and the first fall frost is October 20, giving you a growing season of approximately 191 days.
At an elevation of 1,250 feet, Jackson County receives approximately 33.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 85°F, providing good warmth for Cosmos during the growing season.
Jackson County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Cosmos Planting Timeline — Jackson County, IN
Cosmos Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 15 | Mar 15 – Mar 29 |
| Transplant Outdoors | April 12 | Apr 12 – Apr 26 |
| Direct Sow | April 12 | Apr 12 – May 3 |
| Bloom | June 21 | Jun 21 – Oct 4 |
Plant 0.3" deep · 12" apart · Rows 18" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Transplant Outdoors Direct Sow |
| May | Direct Sow |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–8 · Your soil: N/A
🗺️ USDA Zone
Zone 6b
📆 Growing Season
191 days in Jackson County
Growing Tips for Jackson County
Direct-sow after last frost; cosmos germinates readily at 65-80°F in 7-10 days. Avoid rich soil — excess fertility produces lush foliage at the expense of blooms. Cosmos tolerates poor, dry soil exceptionally well. Pinch seedlings at 8 inches to encourage branching. Self-sows freely; allow some seed heads to mature and drop for a no-fuss perennial effect in warm climates.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Cosmos in Other Locations
Frequently Asked Questions
When should I plant Cosmos in Jackson County, IN?
Jackson County is in Zone 6b with an average last frost of April 12. Plan your Cosmos planting based on this frost date — see the calendar above for exact timing.
What planting zone is Jackson County, IN?
Jackson County, Indiana is in USDA Hardiness Zone 6b. The average last spring frost is April 12 and first fall frost is October 20.
When should I plant Cosmos in Jackson County, IN?
In Jackson County, IN, plant Cosmos after the last frost (around April 12) and before the first frost (around October 20). Best results when soil holds above 50°F.
What growing zone is Jackson County, IN for Cosmos?
Jackson County sits in USDA Zone 6b. Cosmos grows reliably in zones 2a through 11b, so it's a good fit here.
Can Cosmos grow in Jackson County's climate?
Yes — Cosmos grows well in Jackson County's temperate climate. Jackson County averages a 191-day frost-free season, with last frost around April 12 and first frost around October 20.
Your Jackson County Garden Planner — Free
A 22-page printable planner built for Jackson 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.