When to plant watermelons in Colorado Springs: 6 June – 6 July

In Colorado Springs, watermelon: sow for seedlings from 18 April to 8 June; plant into a greenhouse from 16 May to 6 July; plant out into open ground from 6 June to 6 July. For plants and seeds, the places nearby include Rocky Mountain Bee Supply (farm supply, 1 km) and Rick's Garden Center (garden centre, 3 km); addresses and opening hours are below.

Watermelon in Colorado Springs: soil, season and weather

In Colorado Springs the soil, not frost, sets the date: the last frost is over around 3 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 June, 34 days later.

Last spring frost	3 May
Top 7 cm of soil at 18 °C	6 June, 34 days after the last frost
Into an unheated greenhouse	16 May – 6 July; May outside: 5.8 °C at night, 21.5 °C by day; card 18–35 °C
First autumn frost	15 October, 131 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	4 August – 3 September
Days left for picking	72
Daylight	14:05 on 9 May, 14:47 on 6 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 4 rainy days

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

Watermelon in Colorado Springs: care after planting

Planted on 6 June: in the first weeks water every 5 days.

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

6 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 Colorado Springs during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 30.8 °C. Nights average below 18 °C in every month of the season, from 3.5 °C to 15.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	28.8	12.3	40	7	14:52
July	30.8	15.1	56	9	14:38
August	29.5	14.3	37	7	13:43
September	27	10.9	25	4	12:29
October	19.3	3.5	20	4	11:14

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Colorado Springs, Pueblo is 34 days earlier and Cheyenne 2 days later.

City	Distance	Date	Difference
Pueblo	66 km	3 May – 19 July	34 days earlier
Denver	102 km	28 May – 6 July	9 days earlier
Fort Collins	192 km	7 June – 12 July	1 day later
Cheyenne	257 km	8 June – 4 July	2 days later
Grand Junction	326 km	6 May – 18 July	31 days earlier
Santa Fe (United States)	363 km	3 May – 17 July	34 days earlier

Where to buy watermelon plants and seeds near Colorado Springs

Buy plants ready to set out from 6 June to 6 July (from 16 May to 6 July for an unheated greenhouse); seed for raising your own is sown from 18 April to 8 June. Within 15 km of Colorado Springs OpenStreetMap lists 16 garden centres, 2 farm-supply shops, 1 plant nursery, 2 markets and 1 farm shop (collected 20 October 2026).

Rick's Garden Center — garden centre
West Uintah Street 1827, 80904 Colorado Springs · Mon–Sat 09:00–18:00, Sun 10:00–17:00 · 3 km
Sundown Landscaping & Irrigation — garden centre
Lower Gold Camp Road 2310, 80906 Colorado Springs · 4 km · sundownlandscaping.com
Phelan Gardens — garden centre
Austin Bluffs Parkway 4955, 80917 Colorado Springs · 11 km
Rocky Mountain Bee Supply — farm supply
South Walnut Street 24, 80905 Colorado Springs · Thu–Fri 08:00–18:00, Sat 10:00–15:00 · 1 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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