When to plant tomatoes in Cheyenne: 25 May – 23 June

In Cheyenne, tomato: sow for seedlings from 13 March to 2 May; plant into a greenhouse from 4 May to 23 June; plant out into open ground from 25 May to 23 June. 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.

Tomato 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 15 °C — the minimum on the tomato card — only around 25 May, 13 days later.

Last spring frost	12 May
Top 7 cm of soil at 15 °C	25 May, 13 days after the last frost
Into an unheated greenhouse	4 May – 23 June; May outside: 5.1 °C at night, 18 °C by day; card 16–27 °C
First autumn frost	13 October, 141 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	3 August – 1 September
Days left for picking	71
Daylight	12:45 on 3 April, 14:46 on 25 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 5 rainy days

Tomato in Cheyenne: care after planting

Planted on 25 May: in the first weeks water every 4 days.

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

25 May — feed: balanced (NPK)
22 June — feed: nitrogen

Pests and diseases of tomato 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 tomato season

Days average above the tomato card's 16–27 °C in July (29.5 °C) and August (28.3 °C). Nights average below 16 °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
May	18	5.1	87	15	14:28
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

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Cheyenne; the closest date is in Rapid City, 5 days earlier.

City	Distance	Date	Difference
Fort Collins	69 km	14 May – 1 July	11 days earlier
Denver	156 km	8 May – 25 June	17 days earlier
Colorado Springs	257 km	13 May – 25 June	12 days earlier
Pueblo	321 km	28 April – 8 July	27 days earlier
Rapid City	351 km	20 May – 22 June	5 days earlier
Grand Junction	392 km	25 April – 7 July	30 days earlier

Where to buy tomato plants and seeds near Cheyenne

Buy plants ready to set out from 25 May to 23 June (from 4 May to 23 June for an unheated greenhouse); seed for raising your own is sown from 13 March to 2 May. 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