When to Plant Corn in USDA Zone 10b
Your June planting checklist for Zone 10b
Your garden in Zone 10b is working on a schedule, even when you're not. Here's where you should be this June.
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Basket week: corn
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Corn is a warm-season grass grown for its sweet ears, which are best eaten soon after harvest. It is wind-pollinated and must be planted in blocks for good kernel fill.
In Zone 10b, 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.
Corn Planting Timeline — Zone 10b
Where Is USDA Zone 10b?
The map below highlights the states that contain Zone 10b. Click any state to see the Corn planting schedule for that location.
Corn Planting Calendar — Zone 10b
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | January 8 | Jan 8 – Jan 29 |
| Harvest | March 12 | Mar 12 – May 7 |
Plant 1" deep · 12" apart · Rows 36" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Direct Sow |
| February | — |
| March | Harvest |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Free Zone 10b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 10b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
1.5"/week · Moderate — regular watering
Days to Maturity
60–100 days
Soil pH
6 – 7
Zone Temperature Range
35°F to 40°F average annual minimum
Growing Season
365 days (Zone 10b average)
Planting Specifications
| Planting Depth | 1 inches |
| Plant Spacing | 12 inches apart |
| Row Spacing | 36 inches between rows |
Succession Planting Corn in Zone 10b
Sow every 6.9 weeks for continuous harvest throughout the season.
Growing Tips for Corn in Zone 10b
Zone 10b offers a long growing season (~365 days). You can plant Corn earlier and may get multiple harvests.
Corn needs approximately 1.5 inches of water per week during active growth. Adjust watering based on your local rainfall and soil drainage.
Plant in blocks of at least 4 rows rather than single rows for proper pollination. Direct sow after soil reaches 60F. Side-dress with nitrogen when plants are knee-high.
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
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Saving Corn Seeds
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
Corn in Other Zones
Corn 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 Corn in Zone 10b?
In Zone 10b, plan your Corn planting around the average last frost date of January 1. Direct sow outdoors around January 8.
Can Corn grow in Zone 10b?
Yes, Corn can grow well in Zone 10b, hardy in USDA zones 3a through 11b. Zone 10b has a growing season of approximately 364 days, which is sufficient for Corn (60-100 days to maturity).
When can I harvest Corn in Zone 10b?
In Zone 10b, expect to harvest Corn from March 12 – May 7. Corn takes 60-100 days from planting to harvest.
What is the last frost date for Zone 10b?
The average last spring frost in Zone 10b 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 Corn?
Good companion plants for Corn include Squash Summer, Green Beans, Peas, Cucumber. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 10b Garden Planner — Free
A 22-page printable planner tailored to Zone 10b. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.