When to plant Zinnia in Dade County, GA
Dade County sits in USDA Zone 7b. Plant Zinnia between April 1 (after last frost on April 1) and April 22.
When to Plant Zinnia in Dade County, GA
Dade County, Georgia gardeners: here's your July plan
If you only do a handful of things in the garden this July, make it these. They're sequenced around your zone's frost timing.
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Basket week: zinnia
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
August prep starts now
- First harvests: zinnia
Zinnia (Zinnia elegans) is a fast-growing, heat-loving annual that produces bold, dahlia-like blooms from early summer until hard frost. One of the easiest flowers to grow from direct-sown seed, zinnias thrive in hot, dry conditions and are magnets for butterflies and beneficial insects. They make excellent companion plants alongside marigolds in the vegetable garden.
Dade County, Georgia is in USDA Zone 7b. The average last spring frost is April 1 and the first fall frost is October 31, giving you a growing season of approximately 213 days.
At an elevation of 77 feet, Dade County receives approximately 60.9 inches of rainfall annually with predominantly clay loam soil. Summer highs average 89°F, providing good warmth for Zinnia during the growing season. Clay soil retains moisture well for Zinnia, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Zinnia root diseases.
Dade County Soil Profile
Soil Type
Clay Loam
Soil pH
5.7-6.7
Drainage
Well Drained
Zinnia 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 Dade County
How your county's soil matches Zinnia's growing requirements.
Soil pH
Your soil pH (5.7–6.7) is within Zinnia's preferred range (5.5–7.5).
Soil Texture
The clay loam soil in Dade County is excellent for Zinnia — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.3%). Annual compost additions will help Zinnia.
How to Plant Zinnia
Succession Planting Zinnia
Sow every 6.9 weeks. Last sowing by Aug 22 to harvest before frost.
Zinnia Water Budget
Monthly Watering Guide for Zinnia
Zinnia needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Zinnia Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 5.5" | 0" | ❄️ Dormant |
| Feb | — | 5.2" | 0" | ❄️ Dormant |
| Mar | — | 6.5" | 0" | ❄️ Dormant |
| Apr | 2.2" | 4.7" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4.5" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 5.4" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 5.7" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 5.4" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 4.2" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Nov | — | 4.6" | 0" | ❄️ Dormant |
| Dec | — | 5.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Dade County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Zinnia 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.
Zinnia Planting Timeline — Dade County, GA
Zinnia Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 4 | Mar 4 – Mar 18 |
| Transplant Outdoors | April 1 | Apr 1 – Apr 15 |
| Direct Sow | April 1 | Apr 1 – Apr 22 |
| Bloom | June 10 | Jun 10 – Oct 14 |
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 | — |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–70 days
🧪 Soil pH
Needs 5.5–7.5 · Your soil: ideal
🗺️ USDA Zone
Zone 7b
📆 Growing Season
213 days in Dade County
Growing Tips for Zinnia in Dade County
Direct sow Zinnia outdoors after April 01 in Dade County when soil has warmed and frost danger has passed.
With Dade County's clay soil (32% clay), work in 3-4 inches of compost before planting Zinnia. Avoid tilling when soil is wet to prevent compaction.
Common pests for Zinnia in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct-sow after last frost when soil reaches 60°F; seeds germinate in 5-7 days. In zones 3-5 a brief indoor start (4 weeks) is worthwhile but transplant carefully — zinnias dislike root disturbance. Deadhead frequently to extend bloom. Excellent cut flower; harvesting regularly encourages branching. Avoid overhead watering to reduce powdery mildew.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Zinnia in Other Locations
Frequently Asked Questions
When should I plant Zinnia in Dade County, GA?
Dade County is in Zone 7b with an average last frost of April 1. Plan your Zinnia planting based on this frost date — see the calendar above for exact timing.
What planting zone is Dade County, GA?
Dade County, Georgia is in USDA Hardiness Zone 7b. The average last spring frost is April 1 and first fall frost is October 31.
When should I plant Zinnia in Dade County, GA?
In Dade County, GA, plant Zinnia after the last frost (around April 1) and before the first frost (around October 31). Best results when soil holds above 50°F.
What growing zone is Dade County, GA for Zinnia?
Dade County sits in USDA Zone 7b. Zinnia grows reliably in zones 3a through 11b, so it's a good fit here.
Can Zinnia grow in Dade County's climate?
Yes — Zinnia grows well in Dade County's temperate climate. Dade County averages a 213-day frost-free season, with last frost around April 1 and first frost around October 31.
Your Dade County Garden Planner — Free
A 22-page printable planner built for Dade 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.