When to plant Celery in Howard County County,
Plant Celery in Howard County County after April 8; the prime window is March 25–April 15. A second sowing from August 23 to September 6 extends the harvest into fall.
When to Plant Celery in Howard County, MD
June to-do list for Howard County, Maryland
Here's what deserves your attention in Howard County, Maryland this month. Everything below is tailored to Zone 7b and timed around your local frost dates.
Coming up in July — start thinking about
- First harvests: celery
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.
Howard County, Maryland is in USDA Zone 7b. The average last spring frost is April 8 and the first fall frost is November 1, giving you a growing season of approximately 207 days.
At an elevation of 753 feet, Howard County receives approximately 48.3 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Celery during the growing season.
Howard County Soil Profile
Soil Type
Silt Loam
Soil pH
5.6-7
Drainage
Well Drained
Celery 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 Howard County
How your county's soil matches Celery's growing requirements.
Soil pH
Your soil pH (5.6–7.0) overlaps with Celery's range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Howard County is excellent for Celery — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Celery.
Organic Matter
Organic matter is moderate (3.2%). Annual compost additions will help Celery.
How to Plant Celery
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Celery
Sow every 9.1 weeks. Last sowing by Jul 04 to harvest before frost.
For a dedicated fall crop, sow by Aug 23.
Celery Water Budget
Monthly Watering Guide for Celery
Celery needs approximately 1.3 inches of water per week (5.6" per month). Here's how your county's rainfall compares month by month.
| Month | Celery Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 3.6" | 0" | ❄️ Dormant |
| Feb | — | 3.4" | 0" | ❄️ Dormant |
| Mar | — | 4" | 0" | ❄️ Dormant |
| Apr | 5.6" | 4.7" | 0.9" | 💧 Light watering |
| May | 5.6" | 3.8" | 1.8" | 💧 Light watering |
| Jun | 5.6" | 5" | 0.6" | 💧 Light watering |
| Jul | 5.6" | 4.9" | 0.7" | 💧 Light watering |
| Aug | 5.6" | 3.8" | 1.8" | 💧 Light watering |
| Sep | 5.6" | 3.9" | 1.7" | 💧 Light watering |
| Oct | 5.6" | 3.9" | 1.7" | 💧 Light watering |
| Nov | 5.6" | 3.5" | 2.1" | 💧 Light watering |
| Dec | — | 3.8" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Nov in Howard County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Celery 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.
Celery Planting Timeline — Howard County, MD
Celery Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 4 | Mar 4 – Mar 18 |
| Transplant Outdoors | April 8 | Apr 8 – Apr 22 |
| Direct Sow | March 25 | Mar 25 – Apr 15 |
| Harvest | July 1 | Jul 1 – Aug 26 |
| Fall Sowing | August 23 | Aug 23 – Sep 6 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | — |
| June | — |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.3"/week · Natural rainfall sufficient
📅 Days to Maturity
80–120 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 7b
📆 Growing Season
207 days in Howard County
Growing Tips for Celery in Howard County
Direct sow Celery outdoors after April 08 in Howard County when soil has warmed and frost danger has passed.
Common pests for Celery in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
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
Check more plant combinations with our Companion Planting Checker →
Celery in Other Locations
Frequently Asked Questions
When should I plant Celery in Howard County, MD?
Howard County is in Zone 7b with an average last frost of April 8. Plan your Celery planting based on this frost date — see the calendar above for exact timing.
What planting zone is Howard County, MD?
Howard County, Maryland is in USDA Hardiness Zone 7b. The average last spring frost is April 8 and first fall frost is November 1.
When should I plant Celery in Howard County, ?
In Howard County, , plant Celery after the last frost (around April 8) and before the first frost (around November 1). Best results when soil holds above 50°F.
What growing zone is Howard County, for Celery?
Howard County sits in USDA Zone 7b. Celery grows reliably in zones 2a through 10b, so it's a good fit here.
Can Celery grow in Howard County's climate?
Yes — Celery grows well in Howard County's temperate climate. Howard County averages a 207-day frost-free season, with last frost around April 8 and first frost around November 1.
Your Howard County Garden Planner — Free
A 22-page printable planner built for Howard County (Zone 7b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.