When should I plant tomatoes in ZIP 95113?

In ZIP 95113, the main tomatoes target is around Feb 22, based on the representative San Jose frost station and USDA zone 9b.

When should I start tomatoes seeds indoors in 95113?

Start tomatoes seeds indoors in ZIP 95113 around Jan 4, about 42 days before the Feb 15 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 95113 planting calendar

When to plant tomatoes in San Jose, CA - Zone 9b

Q: When is the first frost in San Jose?

San Jose (ZIP 95113) has an average first fall frost around Dec 1, leaving about 289 frost-free days.

In ZIP 95113, plant tomatoes around Feb 22; this uses the San Jose frost station, USDA zone 9b, and tomatoes timing rules.

Your San Jose calendar has a 289-day estimated frost-free season. This estimate uses the representative San Jose frost station, USDA zone 9b, and tomatoes timing rules.

Source: san-jose-mineta frost station, USDA zone 9b, 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 9b San Jose frost station University of California Agriculture and Natural Resources Updated 2026-06-28

Read the method

Answer first

When to start tomatoes seeds indoors in San Jose

In ZIP 95113, start tomatoes seeds indoors around Jan 4, about 42 days before the Feb 15 last-frost estimate.

Start tomatoes seeds indoors in San Jose around Jan 4, about 42 days before the Feb 15 last-frost estimate.

Seed starting schedule

Tomatoes dates for San Jose, CA

Step	Date	How to use it
Start Indoors	January 4, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	February 22, 2026	Move hardened-off seedlings outside after the frost-risk window.

Last frost

When is the last frost in San Jose?

San Jose (ZIP 95113) has an average last spring frost around Feb 15.

First frost

When is the first frost in San Jose?

The average first fall frost is around Dec 1, giving about 289 frost-free days.

Season map

Tomatoes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Jan 4

Transplant

Feb 22

Harvest

May 11

Frost watch

Sep 14

Reminder workflow

Every date has a next action

Start tomatoes indoorsJan 4

Last frost windowFeb 15

Transplant tomatoesFeb 22

First tomatoes harvest windowMay 11

Last tomatoes sowing targetSep 14

Signal	Value	Why it matters
Last frost estimate	February 15, 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	289 days	Longer seasons can support succession crops.
Spacing	18-24 in	Airflow and root space affect yield.
Soil temperature	60 F+	Seeds and transplants stall in cold soil.

GrowZone may earn from qualifying seed or supply links when real affiliate IDs are configured. No monetized links are active without disclosure.

Local data

Why this date changes by ZIP

San Jose frost history and USDA zone 9b 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

Tomatoes timing notes

Harden seedlings off for a week before transplanting. Tomatoes prefers full sun, 18-24 in spacing, and soil near 60 F+.

For fall, count backward from Dec 1. A conservative last sowing target is around Sep 14.