GreenlyWhen to plant pumpkins in San Jose: from 25 April
In San Jose, pumpkin: sow for seedlings from 21 February; plant into a greenhouse from 4 April; plant out into open ground from 25 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 SCUSD Farmstand (farm shop, 10 km); addresses and opening hours are below.
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Pumpkin 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 18 °C — the minimum on the pumpkin card — only around 25 April, 60 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 18 °C | 25 April, 60 days after the last frost |
| Days in the bed to the first harvest (card) | 75 |
| First harvest, if planted in this window | from 9 July |
| Daylight | 11:52 on 14 March, 13:30 on 25 April |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, June, has 0 rainy days |
The same dates in San Jose hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Watermelon.
Pumpkin in San Jose: care after planting
Planted on 25 April: in the first weeks water every 4 days.
Feeding, by the card’s schedule from that day:
- 16 May — feed: nitrogen
Pests and diseases of pumpkin to watch for:
- Bacterial wilt of cucurbits
- Squash bug
- Cucumber beetles
- Blossom-end rot
- Leaf Curl Virus
- Verticillium wilt
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 pumpkin season
About 49 mm of rain falls in the season; June is the driest month (0 mm) and April the wettest (27 mm).
| 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
Pumpkin in nearby cities
Around San Jose, Bakersfield is 23 days earlier and Carson City 18 days later.
| City | Distance | Date | Difference |
|---|---|---|---|
| Stockton | 87 km | 24 April – 8 August | 1 day earlier |
| Sacramento | 142 km | 24 April – 16 August | 1 day earlier |
| Fresno | 199 km | 10 April – 10 August | 15 days earlier |
| Carson City | 274 km | 13 May – 27 June | 18 days later |
| Reno | 303 km | 29 April – 3 July | 4 days later |
| Bakersfield | 338 km | 2 April – 19 August | 23 days earlier |
Where to buy pumpkin plants and seeds near San Jose
Buy plants ready to set out from 25 April (from 4 April for an unheated greenhouse); seed for raising your own is sown from 21 February. 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).
- Pars Kosher Market — market
South Bascom Avenue 3986, 95124 San Jose · 10 km - Downtown San Jose Farmers’ Market — market
Fri 10:00–14:00 · 1 km - Blossom Hill Cerified Farmer's Market — market
Sun 09:00–13:00 · 10 km - SCUSD Farmstand — farm shop
Dunford Way 1055, 94087 Sunnyvale · 10 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow pumpkin
- All frost dates and weather of San Jose
- Shops and markets: San Jose
- Selling a surplus in the United States
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant pumpkins in San Jose?
In San Jose, pumpkin: sow for seedlings from 21 February; plant into a greenhouse from 4 April; plant out into open ground from 25 April. There is no autumn frost here, so the frost dates set no end to the window.
When to sow pumpkins for seedlings in San Jose?
Sow for seedlings from 21 February.
