When to plant watermelons in Pueblo: 3 May – 19 July

In Pueblo, watermelon: sow for seedlings from 15 March to 21 June; plant into a greenhouse from 12 April to 19 July; plant out into open ground from 3 May to 19 July. For plants and seeds, the places nearby include LL Johnson Distributing Co - Pueblo (farm supply, 6 km) and Big R (farm supply, 15 km); addresses and opening hours are below.

Watermelon in Pueblo: soil, season and weather

In Pueblo the soil, not frost, sets the date: the last frost is over around 21 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 3 May, 12 days later.

Last spring frost	21 April
Top 7 cm of soil at 18 °C	3 May, 12 days after the last frost
Into an unheated greenhouse	12 April – 19 July; April outside: 3.8 °C at night, 21.1 °C by day; card 18–35 °C
First autumn frost	28 October, 178 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	1 July – 16 September
Days left for picking	119
Daylight	12:46 on 5 April, 13:51 on 3 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 2 rainy days

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

Watermelon in Pueblo: care after planting

Planted on 3 May: in the first weeks water every 5 days.

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

3 May — 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 Pueblo during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 33.9 °C. Nights average below 18 °C in May, June and August–October (6.1–17.7 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	25	8.9	55	8	14:14
June	32.1	15.6	32	6	14:49
July	33.9	18.5	48	7	14:35
August	32.7	17.7	33	6	13:41
September	30.1	13.7	14	2	12:28
October	22	6.1	16	3	11:15

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

1 of the nearest cities share Pueblo's date.

City	Distance	Date	Difference
Colorado Springs	66 km	6 June – 6 July	34 days later
Denver	168 km	28 May – 6 July	25 days later
Fort Collins	258 km	7 June – 12 July	35 days later
Santa Fe (United States)	309 km	3 May – 17 July	same day
Cheyenne	321 km	8 June – 4 July	36 days later
Grand Junction	356 km	6 May – 18 July	3 days later

Where to buy watermelon plants and seeds near Pueblo

Buy plants ready to set out from 3 May to 19 July (from 12 April to 19 July for an unheated greenhouse); seed for raising your own is sown from 15 March to 21 June. Within 15 km of Pueblo OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 2 markets and 3 farm shops (collected 28 October 2026).

Big R — farm supply
East Industrial Boulevard 115, 81007 Pueblo West · 15 km · bigronline.com
LL Johnson Distributing Co - Pueblo — farm supply
Granada Boulevard 2930, 81005 Pueblo · 6 km · lljohnson.com
Fuel & Iron Food Hall — market
South Union Avenue 400, 81003 · Mon–Sun 11:00–21:00 · 1 km · fuelandironfoodhall.com
Milberger Farms — market
East US 50 28570, 81006 Pueblo · Mon–Sun 07:00–15:00 · 8 km · milbergerfarms.com

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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