When should I plant cucumbers in ZIP 94612?

In ZIP 94612, the main cucumbers target is around Feb 11, based on the representative Oakland frost station and USDA zone 10a.

When should I start cucumbers seeds indoors in 94612?

Start cucumbers seeds indoors in ZIP 94612 around Jan 11, about 21 days before the Feb 1 last-frost estimate.

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 94612 planting calendar

When to plant cucumbers in Oakland, CA - Zone 10a

Q: When is the first frost in Oakland?

Oakland (ZIP 94612) has an average first fall frost around Dec 1, leaving about 303 frost-free days.

In ZIP 94612, plant cucumbers around Feb 11; this uses the Oakland frost station, USDA zone 10a, and cucumbers timing rules.

Your Oakland calendar has a 303-day estimated frost-free season. This estimate uses the representative Oakland frost station, USDA zone 10a, and cucumbers timing rules.

Source: oakland-intl frost station, USDA zone 10a, 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 10a Oakland frost station University of California Agriculture and Natural Resources Updated 2026-06-28

Read the method

Answer first

When to start cucumbers seeds indoors in Oakland

In ZIP 94612, start cucumbers seeds indoors around Jan 11, about 21 days before the Feb 1 last-frost estimate.

Start cucumbers seeds indoors in Oakland around Jan 11, about 21 days before the Feb 1 last-frost estimate.

Seed starting schedule

Cucumbers dates for Oakland, CA

Step	Date	How to use it
Start Indoors	January 11, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	February 11, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	February 11, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Oakland?

Oakland (ZIP 94612) has an average last spring frost around Feb 1.

First frost

When is the first frost in Oakland?

The average first fall frost is around Dec 1, giving about 303 frost-free days.

Season map

Cucumbers windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Jan 11

Direct sow

Feb 11

Transplant

Feb 11

Harvest

Apr 12

Frost watch

Oct 2

Reminder workflow

Every date has a next action

Start cucumbers indoorsJan 11

Last frost windowFeb 1

Direct sow cucumbersFeb 11

Transplant cucumbersFeb 11

First cucumbers harvest windowApr 12

Last cucumbers sowing targetOct 2

Signal	Value	Why it matters
Last frost estimate	February 1, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	December 1, 2026	Fall planting counts backward from this date.
Season length	303 days	Longer seasons can support succession crops.
Spacing	12-18 in	Airflow and root space affect yield.
Soil temperature	65 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Oakland frost history and USDA zone 10a 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

Cucumbers timing notes

Use a trellis if space is tight and keep soil evenly moist. Cucumbers prefers full sun, 12-18 in spacing, and soil near 65 F+.

For fall, count backward from Dec 1. A conservative last sowing target is around Oct 2.