When to plant watermelons in Las Vegas: 1 April – 2 September

In Las Vegas, watermelon: sow for seedlings from 11 February to 5 August; plant into a greenhouse from 11 March to 2 September; plant out into open ground from 1 April to 2 September. For plants and seeds, the places nearby include Desert Living Center (garden centre, 5 km) and Proficient Patios & Backyard Designs (garden centre, 6 km); addresses and opening hours are below.

Watermelon in Las Vegas: soil, season and weather

In Las Vegas the soil, not frost, sets the date: the last frost is over around 6 February, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 1 April, 54 days later.

Last spring frost	6 February
Top 7 cm of soil at 18 °C	1 April, 54 days after the last frost
Into an unheated greenhouse	11 March – 2 September; March outside: 8.5 °C at night, 20.2 °C by day; card 18–35 °C
First autumn frost	12 December, 255 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	30 May – 31 October
Days left for picking	196
Daylight	11:30 on 4 March, 12:34 on 1 April
Watering outdoors when fruiting (card)	every 5 days; the driest month, June, has 0 rainy days

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

Watermelon in Las Vegas: care after planting

Planted on 1 April: in the first weeks water every 5 days.

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

1 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 Las Vegas during the watermelon season

Days average above the watermelon card's 18–35 °C in June (37.5 °C), July (40.1 °C) and August (38.5 °C). Months that stay below 18 °C even by day on average: December (13.8 °C). Nights average below 18 °C in April, May and October–December (4.8–16.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	26.5	13.2	5	2	13:06
May	30.6	16.8	8	2	14:04
June	37.5	23	2	0	14:36
July	40.1	26.4	8	2	14:24
August	38.5	25.1	14	2	13:34
September	34.2	21.2	8	1	12:27
October	27	14.5	8	1	11:19
November	19	8.6	14	2	10:16
December	13.8	4.8	19	3	9:43

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Las Vegas, Phoenix is 37 days earlier and Santa Barbara 43 days later.

City	Distance	Date	Difference
Riverside	321 km	2 April – 9 September	1 day later
Flagstaff	336 km	12 May – 12 July	41 days later
Bakersfield	361 km	2 April – 4 September	1 day later
Phoenix	412 km	23 February – 19 September	37 days earlier
Fresno	419 km	10 April – 26 August	9 days later
Santa Barbara	457 km	14 May – 5 September	43 days later

Where to buy watermelon plants and seeds near Las Vegas

Buy plants ready to set out from 1 April to 2 September (from 11 March to 2 September for an unheated greenhouse); seed for raising your own is sown from 11 February to 5 August. Within 15 km of Las Vegas OpenStreetMap lists 10 garden centres, 1 plant nursery and 1 market (collected 20 October 2026).

Star Nursery Garden Center — garden centre
West Charleston Boulevard 8170, 89117 Las Vegas · Mon–Sun 07:00–17:00 · 12 km · starnursery.com
Whiting Brothers Rock City — garden centre
Vegas Valley Drive 6418, 89142 Las Vegas · 10 km · whitingbrothersrockcity.com
Desert Living Center — garden centre
South Valley View Boulevard 333, 89107 Las Vegas · 5 km
Proficient Patios & Backyard Designs — garden centre
South Valley View Boulevard 3310, 89102 Las Vegas · 6 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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