When to plant zucchini in Jefferson City: 11 May – 18 August

In Jefferson City, zucchini: sow for seedlings from 30 March to 28 July; plant into a greenhouse from 20 April to 18 August; plant out into open ground from 11 May to 18 August.

Zucchini 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 zucchini 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
First autumn frost	4 November, 177 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	16 June – 23 September
Days left for picking	141
Daylight	13:23 on 20 April, 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, Eggplant, Pumpkin and Watermelon.

Zucchini in Jefferson City: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Jefferson City during the zucchini season

About 682 mm of rain falls in the season; November is the driest month (64 mm) and May the wettest (124 mm).

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

Zucchini 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 – 18 August	3 days earlier
Kansas City	216 km	7 May – 15 August	4 days earlier
Springfield	258 km	15 May – 15 August	4 days later
Joplin	263 km	5 May – 15 August	6 days earlier
Topeka	309 km	6 May – 12 August	5 days earlier
Peoria	324 km	18 May – 14 August	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.

Questions