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When to Plant Celery in Greene County, OH

Celery is a marshland plant that requires consistent moisture and cool temperatures to produce crisp, flavorful stalks. It is a rewarding but demanding garden crop.

Greene County, Ohio is in USDA Zone 6a. The average last spring frost is April 23 and the first fall frost is October 19, giving you a growing season of approximately 179 days.

At an elevation of 515 feet, Greene County receives approximately 41.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86ยฐF, providing good warmth for Celery during the growing season.

Greene County, OH (Zone 6a) Moderate season
179 days
Last Spring Frost April 23
179 growing days
First Fall Frost October 19

Greene County Soil Profile

Soil Type

Silt Loam

Soil pH

6-7

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (44 days to spare)
Start indoors: Mar 11 Transplant: Apr 15 🍅 Harvest: Jul 8 – Sep 2
Recommended (50%) ✓ Fits season (39 days to spare)
Start indoors: Mar 19 Transplant: Apr 23 🍅 Harvest: Jul 16 – Sep 10
Safe Start (90%) ✓ Fits season (34 days to spare)
Start indoors: Apr 5 Transplant: May 10 🍅 Harvest: Aug 2 – Sep 27

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

Plant needs
1.5″/week
Rainfall provides
1.0″/week
You supply
0.5″/week
Watering frequency 1-2 times/week
Season total 838 gal / 100 sq ft
Celery needs ~1,450 GDD — county provides 2,595 GDD Excellent fit

Celery Planting Timeline โ€” Greene County, OH

Celery Planting Calendar

Activity When Date Range
Start Indoors March 19 Mar 19 โ€“ Apr 2
Transplant Outdoors April 23 Apr 23 โ€“ May 7
Direct Sow April 9 Apr 9 โ€“ Apr 30
Fall Sowing August 10 Aug 10 โ€“ Aug 24
Harvest July 16 Jul 16 โ€“ Sep 10

Plant 1" deep ยท 15" apart ยท Rows 24" apart

Month-by-Month Timeline

MonthActivities
January โ€”
February โ€”
March Start Indoors
April Start Indoors Transplant Outdoors Direct Sow
May Transplant Outdoors
June โ€”
July Harvest
August Fall Sowing Harvest
September Harvest
October โ€”
November โ€”
December โ€”

Growing Conditions

Sun

Full Sun (6-8+ hours)

Water

High โ€” keep soil consistently moist

Days to Maturity

80โ€“120 days

Soil pH

6 โ€“ 7

USDA Zone

Zone 6a

Growing Season

179 days

Growing Tips for Greene County

Start seeds indoors 10-12 weeks before last frost. Keep soil consistently moist and never let it dry out. Blanch stalks by mounding soil or using collars for milder flavor.

Companion Planting

Good Companions

Avoid Planting Near

  • Carrots
  • Parsnip

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Frequently Asked Questions

When should I plant Celery in Greene County, OH?

Greene County is in Zone 6a with an average last frost of April 23. Plan your Celery planting based on this frost date โ€” see the calendar above for exact timing.

What planting zone is Greene County, OH?

Greene County, Ohio is in USDA Hardiness Zone 6a. The average last spring frost is April 23 and first fall frost is October 19.

๐ŸŒฑ

Plan Your Garden with Confidence

Get our free Garden Planner โ€” designed to help Greene County gardeners in Zone 6a organize planting dates, track what's growing, and never miss a planting window.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Greene County, OH. Local conditions may vary. Last updated: April 2026.