When should I plant radishes in ZIP 92805?

In ZIP 92805, the main radishes target is around Dec 23, based on the representative Anaheim frost station and USDA zone 10b.

When should I start radishes seeds indoors in 92805?

Radishes is usually direct-sown for ZIP 92805. Use the Dec 23 planting window instead of starting it indoors.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 92805 planting calendar

When to plant radishes in Anaheim, CA - Zone 10b

Q: When is the first frost in Anaheim?

Anaheim (ZIP 92805) has an average first fall frost around Dec 15, leaving about 329 frost-free days.

In ZIP 92805, plant radishes around Dec 23; this uses the Anaheim frost station, USDA zone 10b, and radishes timing rules.

Your Anaheim calendar has a 329-day estimated frost-free season. This estimate uses the representative Anaheim frost station, USDA zone 10b, and radishes timing rules.

Source: anaheim-fullerton frost station, USDA zone 10b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 10b Anaheim frost station University of California Agriculture and Natural Resources Updated 2026-06-28

Read the method

Answer first

When to start radishes seeds indoors in Anaheim

In ZIP 92805, radishes is usually direct-sown around Dec 23 instead of started indoors.

Radishes is normally direct-sown in Anaheim. Use around Dec 23 as the outdoor planting window for ZIP 92805.

Seed starting schedule

Radishes dates for Anaheim, CA

Step	Date	How to use it
Direct Sow	December 23, 2025	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Anaheim?

Anaheim (ZIP 92805) has an average last spring frost around Jan 20.

First frost

When is the first frost in Anaheim?

The average first fall frost is around Dec 15, giving about 329 frost-free days.

Season map

Radishes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Direct sow

Dec 23

Harvest

Jan 20

Frost watch

Nov 17

Reminder workflow

Every date has a next action

Direct sow radishesDec 23

Last frost windowJan 20

First radishes harvest windowJan 20

Last radishes sowing targetNov 17

Signal	Value	Why it matters
Last frost estimate	January 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 15, 2026	Fall planting counts backward from this date.
Season length	329 days	Longer seasons can support succession crops.
Spacing	1-2 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Anaheim frost history and USDA zone 10b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

University of California Agriculture and Natural Resources is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Radishes timing notes

Fast crop; harvest promptly before roots get woody. Radishes prefers full sun, 1-2 in spacing, and soil near 40 F+.

For fall, count backward from Dec 15. A conservative last sowing target is around Nov 17.