When to plant watermelons in Stockton: 24 April – 24 August

In Stockton, watermelon: sow for seedlings from 6 March to 27 July; plant into a greenhouse from 3 April to 24 August; plant out into open ground from 24 April to 24 August. For plants and seeds, the places nearby include Pacific Ave Indoor (garden centre, 4 km) and The Fruit Bowl (farm shop, 10 km); addresses and opening hours are below.

Watermelon in Stockton: soil, season and weather

In Stockton the soil, not frost, sets the date: the last frost is over around 4 February, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 24 April, 79 days later.

Last spring frost	4 February
Top 7 cm of soil at 18 °C	24 April, 79 days after the last frost
Into an unheated greenhouse	3 April – 24 August; April outside: 9.2 °C at night, 23.3 °C by day; card 18–35 °C
First autumn frost	3 December, 223 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	22 June – 22 October
Days left for picking	164
Daylight	12:24 on 27 March, 13:30 on 24 April
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 0 rainy days

The same dates in Stockton hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Stockton: care after planting

Planted on 24 April: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

24 April — feed: balanced (NPK)

Pests and diseases of watermelon to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Stockton during the watermelon season

Days average above the watermelon card's 18–35 °C in July (36 °C) and August (35.5 °C). Months that stay below 18 °C even by day on average: December (13.5 °C). Nights average below 18 °C in every month of the season, from 4.8 °C to 16.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	23.3	9.2	37	5	13:10
May	28.1	12.1	18	3	14:12
June	33.4	15.1	1	0	14:47
July	36	16.4	0	0	14:33
August	35.5	16.7	1	0	13:40
September	32.7	15.4	7	1	12:28
October	26.8	11.6	38	3	11:16
November	18.3	6.9	58	6	10:09
December	13.5	4.8	122	10	9:33

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Stockton, Fresno is 14 days earlier and Carson City 19 days later.

City	Distance	Date	Difference
Sacramento	71 km	24 April – 1 September	same day
San Jose	87 km	from 25 April	1 day later
Carson City	188 km	13 May – 13 July	19 days later
Fresno	190 km	10 April – 26 August	14 days earlier
Reno	217 km	29 April – 19 July	5 days later
Redding	307 km	28 April – 1 September	4 days later

Where to buy watermelon plants and seeds near Stockton

Buy plants ready to set out from 24 April to 24 August (from 3 April to 24 August for an unheated greenhouse); seed for raising your own is sown from 6 March to 27 July. Within 15 km of Stockton OpenStreetMap lists 2 garden centres and 1 farm shop (collected 28 October 2026).

Pacific Ave Indoor — garden centre
Pacific Avenue 4633, Stockton · 4 km
Lowes Garden Center — garden centre
Trinity Parkway 10342, Stockton · 12 km
The Fruit Bowl — farm shop
E Waterloo Road 8767, 95215 Stockton · 10 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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