When to plant watermelons in Cheyenne: 8 June – 4 July

In Cheyenne, watermelon: sow for seedlings from 20 April to 6 June; plant into a greenhouse from 18 May to 4 July; plant out into open ground from 8 June to 4 July. For plants and seeds, the places nearby include WY fresh (farm shop, 3 km) and River Bend Nursery and Stone (garden centre, 7 km); addresses and opening hours are below.

Watermelon in Cheyenne: soil, season and weather

In Cheyenne the soil, not frost, sets the date: the last frost is over around 12 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 8 June, 27 days later.

Last spring frost	12 May
Top 7 cm of soil at 18 °C	8 June, 27 days after the last frost
Into an unheated greenhouse	18 May – 4 July; May outside: 5.1 °C at night, 18 °C by day; card 18–35 °C
First autumn frost	13 October, 127 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	6 August – 1 September
Days left for picking	68
Daylight	14:20 on 11 May, 15:03 on 8 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 5 rainy days

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

Watermelon in Cheyenne: care after planting

Planted on 8 June: in the first weeks water every 5 days.

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

8 June — 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 Cheyenne during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 29.5 °C. Months that stay below 18 °C even by day on average: October (16 °C). Nights average below 18 °C in every month of the season, from 3.2 °C to 15.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	26.3	12	37	8	15:07
July	29.5	15.3	36	9	14:52
August	28.3	14.4	31	8	13:51
September	25.1	10.7	20	5	12:31
October	16	3.2	22	5	11:10

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Cheyenne; the closest date is in Fort Collins, 1 day earlier.

City	Distance	Date	Difference
Fort Collins	69 km	7 June – 12 July	1 day earlier
Denver	156 km	28 May – 6 July	11 days earlier
Colorado Springs	257 km	6 June – 6 July	2 days earlier
Pueblo	321 km	3 May – 19 July	36 days earlier
Rapid City	351 km	6 June – 3 July	2 days earlier
Grand Junction	392 km	6 May – 18 July	33 days earlier

Where to buy watermelon plants and seeds near Cheyenne

Buy plants ready to set out from 8 June to 4 July (from 18 May to 4 July for an unheated greenhouse); seed for raising your own is sown from 20 April to 6 June. Within 15 km of Cheyenne OpenStreetMap lists 3 garden centres and 1 farm shop (collected 20 October 2026).

River Bend Nursery and Stone — garden centre
Yellowstone Road 8908, 82009 Cheyenne · 7 km · riverbendnurseryandstone.com
WY fresh — farm shop
Walterscheid Boulevard 200, 82007-2352 Cheyenne · 3 km
Walmart Garden Center — garden centre
5 km · walmart.com
Walmart Garden Center — garden centre
4 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.

Questions