When to plant eggplants in Jefferson City: 11 May – 15 July

In Jefferson City, eggplant: sow for seedlings from 19 February to 16 May; plant into a greenhouse from 20 April to 15 July; plant out into open ground from 11 May to 15 July.

Eggplant in Jefferson City: soil, season and weather

In Jefferson City the soil, not frost, sets the date: the last frost is over around 5 April, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 11 May, 36 days later.

Last spring frost	5 April
Top 7 cm of soil at 18 °C	11 May, 36 days after the last frost
Into an unheated greenhouse	20 April – 15 July; April outside: 8 °C at night, 19.9 °C by day; card 21–29 °C
First autumn frost	4 November, 177 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	20 July – 23 September
Days left for picking	107
Daylight	11:47 on 12 March, 14:08 on 11 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 7 rainy days

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

Eggplant in Jefferson City: 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 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 Jefferson City during the eggplant season

Days average above the eggplant card's 21–29 °C in June (30.6 °C), July (31.9 °C) and August (30.6 °C). Months that stay below 21 °C even by day on average: November (14 °C). Nights average below 21 °C in May, June and August–November (4.1–20.3 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	24.5	14	124	14	14:15
June	30.6	19.4	122	11	14:51
July	31.9	21.5	111	11	14:37
August	30.6	20.3	100	10	13:42
September	28.4	17.4	66	7	12:29
October	21.4	10.9	95	9	11:15
November	14	4.1	64	7	10:06

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Jefferson City, Joplin is 6 days earlier and Peoria 7 days later.

City	Distance	Date	Difference
St. Louis	172 km	8 May – 15 July	3 days earlier
Kansas City	216 km	7 May – 12 July	4 days earlier
Springfield	258 km	15 May – 12 July	4 days later
Joplin	263 km	5 May – 12 July	6 days earlier
Topeka	309 km	6 May – 9 July	5 days earlier
Peoria	324 km	18 May – 11 July	7 days later

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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