🍠 Can I Plant Radish in San Diego, CA?

2026 planting guide for Zone 11a · Last frost ~N/A (frost-free) · Growing season 365 days (year-round)

✅ YES — Good temps, but watch for heat — highs near 83°F

Temperature conditions are suitable for Radish. Highs near 83°F are on the warm side — make sure plants have plenty of water.

Planting window: Jun 18 – Jul 2
Good to go — plant now while conditions are right.
Live result based on current forecast for San Diego, CA · Updates every 6 hours
USDA Zone
11a
Last Spring Frost
Frost-free year-round
First Fall Frost
Frost-free
Growing Season
365 days (year-round)
Ideal Temp for Radish
40–65°F
Frost Risk
✅ Tolerant

Growing Radish in San Diego

San Diego's Zone 11a coastal climate is virtually frost-free year-round, making it one of the most gardener-friendly climates in the U.S. The moderate temperatures support a 12-month growing season, though afternoon marine layer keeps conditions cooler than inland areas — great for greens, a bit challenging for extreme heat-lovers.

In San Diego, radish grows best during the cooler winter months, roughly October through March.

Radish thrives between 40°F and 65°F. It tolerates temperatures as low as 32°F, making it a candidate for early spring planting before the last frost date. Expect 22–30 days from transplant to first harvest. One of the fastest vegetables. Spring or fall.

Frequently Asked Questions

When can I plant radish in San Diego, CA?

In San Diego, radish grows best during the cooler winter months, roughly October through March.

What is the USDA hardiness zone for San Diego?

San Diego, CA is in USDA Plant Hardiness Zone 11a. The last expected spring frost is frost-free year-round, and the first fall frost arrives around late December at the earliest. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant radish outside in San Diego right now?

That depends on the current weather forecast. Radish needs temperatures above 32°F (ideally 40–65°F) to thrive. CanIPlant checks your real 7-day forecast and any active frost alerts to give you a live YES, NO, or WAIT answer — just enter your ZIP code.

Can I grow radish in San Diego 2026?

Yes — Radish grows well in San Diego, CA. With a Zone 11a climate and a growing season of 365 days (year-round), San Diego is well-suited for cool-season crops like radish. As a frost-tolerant crop, radish can even go out a few weeks before the last frost date.

Grow Radish in Other Cities

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