When to plant bell peppers in Bismarck: 31 May – 25 June

In Bismarck, bell pepper: sow for seedlings from 11 March to 26 April; plant into a greenhouse from 10 May to 25 June; plant out into open ground from 31 May to 25 June.

Bell Pepper in Bismarck: soil, season and weather

In Bismarck the soil, not frost, sets the date: the last frost is over around 1 May, but the top 7 cm of soil reaches 18 °C — the minimum on the bell pepper card — only around 31 May, 30 days later.

Last spring frost	1 May
Top 7 cm of soil at 18 °C	31 May, 30 days after the last frost
Into an unheated greenhouse	10 May – 25 June; May outside: 7.4 °C at night, 20.2 °C by day; card 15–30 °C
First autumn frost	15 October, 137 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	9 August – 3 September
Days left for picking	67
Daylight	12:48 on 1 April, 15:34 on 31 May
Watering outdoors when fruiting (card)	every 4 days; the driest month, October, has 5 rainy days

The same dates in Bismarck hold for Cucumber, Eggplant, Zucchini, Pumpkin and Watermelon.

Bell Pepper in Bismarck: care after planting

Planted on 31 May: in the first weeks water every 5 days.

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

31 May — feed: balanced (NPK)
28 June — feed: nitrogen

Pests and diseases of bell pepper 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 Bismarck during the bell pepper season

No month of the season averages above the bell pepper card's 15–30 °C by day; the warmest, July, averages 29.1 °C. Months that stay below 15 °C even by day on average: October (13.7 °C). Nights average below 15 °C in May, June and September, October (3.6–14.1 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.2	7.4	67	10	15:01
June	26.6	14.1	69	9	15:51
July	29.1	17.2	63	8	15:31
August	27.6	15.8	68	8	14:15
September	23.4	11.8	55	7	12:37
October	13.7	3.6	44	5	10:58

ERA5 2016–2025, Open-Meteo

Bell Pepper in nearby cities

Around Bismarck, Sioux Falls is 7 days earlier and Rapid City 6 days later.

City	Distance	Date	Difference
Pierre	274 km	25 May – 4 July	6 days earlier
Fargo	303 km	31 May – 26 June	same day
Grand Forks	303 km	5 June – 26 June	5 days later
Rapid City	360 km	6 June – 22 June	6 days later
Winnipeg	436 km	1 June – 22 June	1 day later
Sioux Falls	482 km	24 May – 1 July	7 days earlier

Where to buy bell pepper plants and seeds near Bismarck

Buy plants ready to set out from 31 May to 25 June (from 10 May to 25 June for an unheated greenhouse); seed for raising your own is sown from 11 March to 26 April. Within 15 km of Bismarck OpenStreetMap lists 1 garden centre and 1 market (collected 28 October 2026).

Bismarket — market
South Washington Street 318, 58504 Bismarck · Jun–Oct Sat 10:00–13:00 · 2 km · bismarket.com
Lowe's Plant Section — 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