When to Plant Marigolds in USDA Zone 10a
Top priorities for Zone 10a gardeners in June
June rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Zone 10a.
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Start harvesting marigolds
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
Get ahead of July
- First harvests: marigolds
Marigolds (Tagetes patula) are warm-season annuals beloved for their cheerful orange, yellow, and red blooms — and for their well-documented ability to repel pest nematodes in vegetable beds. Easy from seed, drought-tolerant once established, and bloom from early summer until the first hard frost.
In Zone 10a, the average last spring frost is around January 1 and the first fall frost is around December 31, giving you a growing season of approximately 364 days.
Marigolds Planting Timeline — Zone 10a
Where Is USDA Zone 10a?
The map below highlights the states that contain Zone 10a. Click any state to see the Marigolds planting schedule for that location.
Marigolds Planting Calendar — Zone 10a
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | November 27 | Nov 27 – Dec 11 |
| Transplant Outdoors | November 27 | Nov 27 – Dec 11 |
| Direct Sow | November 27 | Nov 27 – Dec 18 |
| Bloom | January 22 | Jan 22 – Jul 30 |
Plant 0.3" deep · 10" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Bloom |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | — |
| September | — |
| October | — |
| November | Start Indoors Transplant Outdoors Direct Sow |
| December | Start Indoors Transplant Outdoors Direct Sow |
Free Zone 10a Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 10a with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
Days to Maturity
50–70 days
Soil pH
6 – 7.5
Zone Temperature Range
30°F to 35°F average annual minimum
Growing Season
365 days (Zone 10a average)
Planting Specifications
| Planting Depth | 0.3 inches |
| Plant Spacing | 10 inches apart |
| Row Spacing | 12 inches between rows |
Succession Planting Marigolds in Zone 10a
Sow every 5.7 weeks for continuous harvest throughout the season.
Growing Tips for Marigolds in Zone 10a
Zone 10a offers a long growing season (~365 days). You can plant Marigolds earlier and may get multiple harvests.
Direct-sow after last frost or start indoors 4-6 weeks earlier. Deadhead spent blooms to keep new flowers coming. French marigolds (T. patula) are the most reliable nematode repellents — plant a band around vegetable beds. Tolerate poor soil but bloom best with monthly compost.
Companion Planting
Good Companions
Avoid Planting Near
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
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Saving Marigolds Seeds
Very easy to save. Seeds are the long, thin, dark pieces inside the dried flower head.
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Related Plants
Marigolds in Other Zones
Marigolds 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 Marigolds in Zone 10a?
In Zone 10a, plan your Marigolds planting around the average last frost date of January 1. Start seeds indoors around November 27. Direct sow outdoors around November 27. Transplant seedlings around November 27.
Can Marigolds grow in Zone 10a?
Yes, Marigolds can grow well in Zone 10a, hardy in USDA zones 2a through 11b. Zone 10a has a growing season of approximately 364 days, which is sufficient for Marigolds (50-70 days to maturity).
When can I harvest Marigolds in Zone 10a?
In Zone 10a, expect to harvest Marigolds from January 22 – July 30. Marigolds takes 50-70 days from planting to harvest.
What is the last frost date for Zone 10a?
The average last spring frost in Zone 10a is around January 1, and the first fall frost is around December 31. This gives a growing season of approximately 364 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Marigolds?
Good companion plants for Marigolds include Tomatoes, Peppers, Basil, Squash. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 10a Garden Planner — Free
A 22-page printable planner tailored to Zone 10a. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.