When to plant tomatoes in Fargo: 18 May – 26 June

In Fargo, tomato: sow for seedlings from 6 March to 5 May; plant into a greenhouse from 27 April to 26 June; plant out into open ground from 18 May to 26 June. For plants and seeds, the places nearby include Hildbrants Farmers Market (garden centre, 8 km); addresses and opening hours are below.

Tomato in Fargo: soil, season and weather

In Fargo the soil, not frost, sets the date: the last frost is over around 30 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 18 May, 18 days later.

Last spring frost	30 April
Top 7 cm of soil at 15 °C	18 May, 18 days after the last frost
Into an unheated greenhouse	27 April – 26 June; April outside: -0.1 °C at night, 11.2 °C by day; card 16–27 °C
First autumn frost	16 October, 151 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	27 July – 4 September
Days left for picking	81
Daylight	12:31 on 27 March, 15:09 on 18 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 8 rainy days

Tomato in Fargo: care after planting

Planted on 18 May: in the first weeks water every 4 days.

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

18 May — feed: balanced (NPK)
15 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 Fargo during the tomato season

Days average above the tomato card's 16–27 °C in July (28.4 °C). Months that stay below 16 °C even by day on average: October (13.6 °C). Nights average below 16 °C in May, June and September, October (4.7–15.4 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.9	8.3	76	9	15:02
June	26.9	15.4	89	10	15:51
July	28.4	17.4	84	10	15:32
August	26.5	16.3	96	9	14:15
September	22.8	12.8	68	8	12:37
October	13.6	4.7	55	8	10:57

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Fargo, Sioux Falls is 7 days earlier and Duluth 18 days later.

City	Distance	Date	Difference
Grand Forks	118 km	24 May – 26 June	6 days later
Bismarck	303 km	22 May – 25 June	4 days later
Winnipeg	337 km	24 May – 22 June	6 days later
Minneapolis	345 km	18 May – 4 July	same day
Duluth	356 km	5 June – 8 July	18 days later
Sioux Falls	371 km	11 May – 1 July	7 days earlier

Where to buy tomato plants and seeds near Fargo

Buy plants ready to set out from 18 May to 26 June (from 27 April to 26 June for an unheated greenhouse); seed for raising your own is sown from 6 March to 5 May. Within 15 km of Fargo OpenStreetMap lists 3 garden centres and 3 markets (collected 20 October 2026).

Hildbrants Farmers Market — garden centre
Main Avenue East 349, 58078 West Fargo · 8 km
Red River Market — market
Broadway North 210, 58102 Fargo · Jul 08–Oct 28 Sat 10:00–14:00 · 0 km · redriver.market
Moorhead Farmers Market — market
1st Avenue North 202, 56560 Moorhead · Jun–Sept: Tue 03:30–18:30; Jul 04 closed · 1 km · cityofmoorhead.com
Brewhalla — market
1st Avenue North 1702, 58103 Fargo · Mon–Sun 10:00–20:00 · 2 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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