GreenlyWhen to plant tomatoes in San Jose: from 6 April
In San Jose, tomato: sow for seedlings from 23 January; plant into a greenhouse from 16 March; plant out into open ground from 6 April. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Plant Sitter (garden centre, 2 km) and Bay Maples (garden centre, 3 km); addresses and opening hours are below.
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Tomato in San Jose: soil, season and weather
In San Jose the soil, not frost, sets the date: the last frost is over around 24 February, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 6 April, 41 days later. San Jose has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 24 February |
|---|---|
| Top 7 cm of soil at 15 °C | 6 April, 41 days after the last frost |
| Into an unheated greenhouse | from 16 March; March outside: 7 °C at night, 16.9 °C by day; card 16–27 °C |
| Days in the bed to the first harvest (card) | 70 |
| First harvest, if planted in this window | from 15 June |
| Daylight | 10:45 on 13 February, 12:47 on 6 April |
| Watering outdoors when fruiting (card) | every 3 days; the driest month, June, has 0 rainy days |
Tomato in San Jose: care after planting
Planted on 6 April: in the first weeks water every 4 days.
Feeding, by the card’s schedule from that day:
- 6 April — feed: balanced (NPK)
- 4 May — feed: nitrogen
Pests and diseases of tomato to watch for:
- Bacterial canker of tomato
- Tomato leaf mould
- Late Blight
- Bacterial spot
- Fruit cracking
- Bacterial wilt (brown rot of potato)
Dates count from the first planting day of the window above; a later planting moves them by as many days.
Weather in San Jose during the tomato season
Days average above the tomato card's 16–27 °C in June–September (28.7–30.2 °C). Nights average below 16 °C in every month of the season, from 8.6 °C to 15 °C.
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| April | 20.8 | 8.6 | 27 | 4 | 13:08 |
| May | 24.4 | 10.8 | 16 | 3 | 14:10 |
| June | 28.7 | 13.3 | 0 | 0 | 14:43 |
| July | 30.2 | 14.5 | 0 | 0 | 14:30 |
| August | 30.1 | 15 | 1 | 0 | 13:38 |
| September | 28.7 | 14.5 | 5 | 1 | 12:28 |
ERA5 2016–2025, Open-Meteo
Tomato in nearby cities
Around San Jose, Fresno is 22 days earlier and Carson City 32 days later.
| City | Distance | Date | Difference |
|---|---|---|---|
| Stockton | 87 km | 1 April – 13 August | 5 days earlier |
| Sacramento | 142 km | 31 March – 21 August | 6 days earlier |
| Fresno | 199 km | 15 March – 15 August | 22 days earlier |
| Carson City | 274 km | 8 May – 2 July | 32 days later |
| Reno | 303 km | 23 April – 8 July | 17 days later |
| Bakersfield | 338 km | 16 March – 24 August | 21 days earlier |
Where to buy tomato plants and seeds near San Jose
Buy plants ready to set out from 6 April (from 16 March for an unheated greenhouse); seed for raising your own is sown from 23 January. Within 15 km of San Jose OpenStreetMap lists 11 garden centres, 1 farm-supply shop, 1 plant nursery, 16 markets and 1 farm shop (collected 20 October 2026).
- Bay Maples — garden centre
North 1st Street 1231, 95112 San Jose · Mon–Thu 07:00–17:30 · 3 km · baymaples.com - SummerWinds Nursery — garden centre
South De Anza Boulevard 1491, 95014 Cupertino · Mon–Sun 09:00–18:00 · 14 km · summerwindsnursery.com - Plant Sitter — garden centre
South 1st Street 605, 95113 San Jose · 12:00–17:30 · 2 km · theplantsitter-california.square.site - Yamagami's Garden Center — garden centre
South De Anza Boulevard 1361, 95014 Cupertino · Mon–Sun 09:00–18:00 · 13 km · yamagamis.com
Places: © OpenStreetMap contributors, ODbL.
- How to grow tomato
- All frost dates and weather of San Jose
- Shops and markets: San Jose
- Selling a surplus in the United States
- When to plant tomatoes in the United States
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant tomatoes in San Jose?
In San Jose, tomato: sow for seedlings from 23 January; plant into a greenhouse from 16 March; plant out into open ground from 6 April. There is no autumn frost here, so the frost dates set no end to the window.
When to sow tomatoes for seedlings in San Jose?
Sow for seedlings from 23 January.
