When to Plant Geraniums in USDA Zone 8a
Your June planting checklist for Zone 8a
Each item below is timed to Zone 8a's frost dates and soil temperatures. Skip nothing, stress about nothing.
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Start geraniums under lights
These need a head start before your last frost (March 28). Sow into cells now so you're ready to transplant in a few weeks.
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It's harvest week for geraniums
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Get ahead of July
- First harvests: geraniums
Geraniums (Pelargonium × hortorum) are tender perennials grown as warm-season annuals throughout North America. Prized for their bold flower clusters, long bloom period, and tolerance of summer heat when planted in well-drained soil, they anchor window boxes, containers, and bed borders from late spring until hard frost. Zones 9b–11b can overwinter plants in the ground.
In Zone 8a, the average last spring frost is around March 8 and the first fall frost is around November 18, giving you a growing season of approximately 255 days.
Geraniums Planting Timeline — Zone 8a
Where Is USDA Zone 8a?
The map below highlights the states that contain Zone 8a. Click any state to see the Geraniums planting schedule for that location.
Geraniums Planting Calendar — Zone 8a
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 28 | Dec 28 – Jan 11 |
| Transplant Outdoors | March 1 | Mar 1 – Mar 15 |
| Bloom | May 10 | May 10 – Sep 27 |
Plant 0.1" deep · 12" apart · Rows 14" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | — |
| March | Transplant Outdoors |
| April | — |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | — |
| November | — |
| December | Start Indoors |
Free Zone 8a Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 8a with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
Days to Maturity
70–100 days
Soil pH
6 – 7
Zone Temperature Range
10°F to 15°F average annual minimum
Growing Season
255 days (Zone 8a average)
Planting Specifications
| Planting Depth | 0.1 inches |
| Plant Spacing | 12 inches apart |
| Row Spacing | 14 inches between rows |
Succession Planting Geraniums in Zone 8a
Sow every 8 weeks for continuous harvest throughout the season.
Growing Tips for Geraniums in Zone 8a
Start seeds indoors 10–12 weeks before last frost — germination is slow and erratic without bottom heat (70–75°F). Transplant after frost danger passes. Geraniums rarely direct-sown; cuttings or transplants are the standard. Deadhead spent umbels weekly to maintain continuous bloom. Let soil dry slightly between waterings to prevent root rot. In zones 10–11 plants may be left in ground year-round or overwintered as houseplants.
Companion Planting
Good Companions
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Saving Geraniums Seeds
Recommended for Your Garden
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Keep your garden organized with durable, weather-resistant plant labels.
Related Plants
Geraniums in Other Zones
Geraniums by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
When should I plant Geraniums in Zone 8a?
In Zone 8a, plan your Geraniums planting around the average last frost date of March 8. Start seeds indoors around December 28. Transplant seedlings around March 1.
Can Geraniums grow in Zone 8a?
Yes, Geraniums can grow well in Zone 8a, hardy in USDA zones 2a through 11b. Zone 8a has a growing season of approximately 255 days, which is sufficient for Geraniums (70-100 days to maturity).
When can I harvest Geraniums in Zone 8a?
In Zone 8a, expect to harvest Geraniums from May 10 – September 27. Geraniums takes 70-100 days from planting to harvest.
What is the last frost date for Zone 8a?
The average last spring frost in Zone 8a is around March 8, and the first fall frost is around November 18. This gives a growing season of approximately 255 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Geraniums?
Good companion plants for Geraniums include Lobelia, Sweet Alyssum, Petunias, Bachelors Button. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 8a Garden Planner — Free
A 22-page printable planner tailored to Zone 8a. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.