When to Plant Radish in USDA Zone 9b
Top priorities for Zone 9b gardeners in May
We've pulled the most time-sensitive tasks for Zone 9b this May and put them front and centre. Tackle them in order.
Radishes are one of the fastest-growing vegetables, with some varieties ready in under a month. They come in round, elongated, and large winter types.
In Zone 9b, the average last spring frost is around January 25 and the first fall frost is around December 20, giving you a growing season of approximately 329 days.
Radish Planting Timeline — Zone 9b
Where Is USDA Zone 9b?
The map below highlights the states that contain Zone 9b. Click any state to see the Radish planting schedule for that location.
Radish Planting Calendar — Zone 9b
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | January 4 | Jan 4 – Jan 25 |
| Harvest | February 1 | Feb 1 – Feb 22 |
| Fall Sowing | October 25 | Oct 25 – Nov 8 |
Plant 0.5" deep · 2" apart · Rows 6" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Direct Sow |
| February | Harvest |
| March | — |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Fall Sowing |
| December | — |
Free Zone 9b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 9b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Moderate — regular watering
Days to Maturity
22–35 days
Soil pH
6 – 7
Zone Temperature Range
°F to °F average annual minimum
Growing Season
329 days (Zone average)
Planting Specifications
| Planting Depth | 0.5 inches |
| Plant Spacing | 2 inches apart |
| Row Spacing | 6 inches between rows |
Succession Planting Radish in Zone
Sow every 2.4 weeks for continuous harvest throughout the season.
Growing Tips for Radish in Zone
Zone has a short growing season (~329 days). Start Radish indoors early and use season-extension techniques like row covers and cold frames.
Radish needs approximately 0.5 inches of water per week during active growth. Adjust watering based on your local rainfall and soil drainage.
Direct sow every 1-2 weeks for continuous harvest. Do not transplant. Harvest spring radishes promptly to prevent them from becoming pithy and hot.
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 Radish 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
Radish in Other Zones
Radish 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 Radish in Zone 9b?
In Zone 9b, plan your Radish planting around the average last frost date of January 25. Direct sow outdoors around January 4.
Can Radish grow in Zone 9b?
Yes, Radish can grow well in Zone 9b, hardy in USDA zones 2a through 11b. Zone 9b has a growing season of approximately 329 days, which is sufficient for Radish (22-35 days to maturity).
When can I harvest Radish in Zone 9b?
In Zone 9b, expect to harvest Radish from February 1 – February 22. Radish takes 22-35 days from planting to harvest.
What is the last frost date for Zone 9b?
The average last spring frost in Zone 9b is around January 25, and the first fall frost is around December 20. This gives a growing season of approximately 329 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Radish?
Good companion plants for Radish include Carrots, Lettuce, Peas, Spinach. These companions can help with pest control, pollination, and nutrient sharing.
Your Free Printable Garden Planner
A 24-page printable planner tailored to your zone. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.