When to plant eggplants in Pierre: 25 May – 4 July

In Pierre, eggplant: sow for seedlings from 5 March to 5 May; plant into a greenhouse from 4 May to 4 July; plant out into open ground from 25 May to 4 July.

Eggplant in Pierre: soil, season and weather

In Pierre the soil, not frost, sets the date: the last frost is over around 26 April, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 25 May, 29 days later.

Last spring frost	26 April
Top 7 cm of soil at 18 °C	25 May, 29 days after the last frost
Into an unheated greenhouse	4 May – 4 July; May outside: 9.9 °C at night, 21.8 °C by day; card 21–29 °C
First autumn frost	24 October, 152 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	3 August – 12 September
Days left for picking	82
Daylight	12:26 on 26 March, 15:06 on 25 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 6 rainy days

The same dates in Pierre hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Pierre: 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 eggplant 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 Pierre during the eggplant season

Days average above the eggplant card's 21–29 °C in June (29.3 °C), July (31.7 °C) and August (30.2 °C). Months that stay below 21 °C even by day on average: October (16.5 °C). Nights average below 21 °C in every month of the season, from 5.9 °C to 19.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.8	9.9	83	11	14:46
June	29.3	17	67	8	15:31
July	31.7	19.7	68	9	15:13
August	30.2	18.4	59	7	14:04
September	26.3	14.5	50	6	12:34
October	16.5	5.9	41	6	11:03

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Pierre, Grand Island is 7 days earlier and Rapid City 12 days later.

City	Distance	Date	Difference
Rapid City	233 km	6 June – 22 June	12 days later
Bismarck	274 km	31 May – 25 June	6 days later
Sioux Falls	302 km	24 May – 1 July	1 day earlier
Fargo	391 km	31 May – 26 June	6 days later
Grand Island	416 km	18 May – 7 July	7 days earlier
Grand Forks	467 km	5 June – 26 June	11 days later

Where to buy eggplant plants and seeds near Pierre

Buy plants ready to set out from 25 May to 4 July (from 4 May to 4 July for an unheated greenhouse); seed for raising your own is sown from 5 March to 5 May. Within 15 km of Pierre OpenStreetMap lists 1 market (collected 28 October 2026).

The Alley Exchange — market
South Pierre Street 339, 57501 Pierre · 3 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