When to plant tomatoes in Sioux Falls: 11 May – 1 July

In Sioux Falls, tomato: sow for seedlings from 27 February to 10 May; plant into a greenhouse from 20 April to 1 July; plant out into open ground from 11 May to 1 July. For plants and seeds, the places nearby include Prairie Greens Produce (farm shop, 14 km); addresses and opening hours are below.

Tomato in Sioux Falls: soil, season and weather

In Sioux Falls the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 11 May, 17 days later.

Last spring frost	24 April
Top 7 cm of soil at 15 °C	11 May, 17 days after the last frost
Into an unheated greenhouse	20 April – 1 July; April outside: 2.5 °C at night, 14.4 °C by day; card 16–27 °C
First autumn frost	21 October, 163 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	20 July – 9 September
Days left for picking	93
Daylight	12:07 on 20 March, 14:32 on 11 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 8 rainy days

Tomato in Sioux Falls: care after planting

Planted on 11 May: in the first weeks water every 4 days.

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

11 May — feed: balanced (NPK)
8 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 Sioux Falls during the tomato season

Days average above the tomato card's 16–27 °C in June (28.2 °C), July (29.2 °C) and August (27.5 °C). Nights average below 16 °C in May (10 °C), September (14.5 °C) and October (6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.5	10	108	11	14:41
June	28.2	16.9	110	11	15:24
July	29.2	18.6	71	8	15:07
August	27.5	17.5	90	10	14:01
September	25.1	14.5	64	8	12:33
October	16	6	67	8	11:05

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Sioux Falls, Lincoln is 18 days earlier and Minneapolis 7 days later.

City	Distance	Date	Difference
Omaha	262 km	26 April – 6 July	15 days earlier
Pierre	302 km	9 May – 4 July	2 days earlier
Lincoln	304 km	23 April – 8 July	18 days earlier
Minneapolis	319 km	18 May – 4 July	7 days later
Grand Island	321 km	30 April – 7 July	11 days earlier
Des Moines	334 km	30 April – 7 July	11 days earlier

Where to buy tomato plants and seeds near Sioux Falls

Buy plants ready to set out from 11 May to 1 July (from 20 April to 1 July for an unheated greenhouse); seed for raising your own is sown from 27 February to 10 May. Within 15 km of Sioux Falls OpenStreetMap lists 1 garden centre, 5 farm-supply shops, 2 markets and 1 farm shop (collected 20 October 2026).

The Prairie Farmers' Market — market
North Cherapa Place 300, 57104 Sioux Falls · 1 km · theprairiefarmersmarket.com
Look's Marketplace — market
East 69th Street 500, 57108 Sioux Falls · 6 km · looksmarket.com
Prairie Greens Produce — farm shop
East Birch Street 1200, 57005 Brandon · Sat 09:00–13:30 · 14 km · prairiegreensproduce.com
Landscape Garden Centers — garden centre
9 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