When to plant zucchini in Charleston: 12 March – 3 October

In Charleston, zucchini: sow for seedlings from 29 January to 12 September; plant into a greenhouse from 19 February to 3 October; plant out into open ground from 12 March to 3 October. For plants and seeds, the places nearby include SiteOne Landscape Supply (garden centre, 12 km) and Walmart Garden Center (garden centre, 15 km); addresses and opening hours are below.

Zucchini in Charleston: soil, season and weather

In Charleston the soil, not frost, sets the date: the last frost is over around 4 February, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 12 March, 36 days later.

Last spring frost	4 February
Top 7 cm of soil at 18 °C	12 March, 36 days after the last frost
First autumn frost	20 December, 283 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	17 April – 8 November
Days left for picking	247
Daylight	11:09 on 19 February, 11:50 on 12 March
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 8 rainy days

The same dates in Charleston hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Charleston: care after planting

Planted on 12 March: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Charleston during the zucchini season

About 1225 mm of rain falls in the season; November is the driest month (76 mm) and August the wettest (201 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
March	20.1	11.6	80	8	11:56
April	23.4	15	99	7	12:58
May	27	19.4	107	12	13:50
June	29.5	22.8	146	16	14:18
July	31	24.7	153	20	14:07
August	29.9	24.1	201	20	13:23
September	28.3	21.7	155	13	12:24
October	24.7	17	87	7	11:24
November	19.9	11.4	76	8	10:29
December	16.5	8.4	121	9	10:00

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Charleston, Jacksonville is 29 days earlier and Greenville 42 days later.

City	Distance	Date	Difference
Savannah	135 km	25 February – 7 October	15 days earlier
Columbia	170 km	28 March – 12 September	16 days later
Wilmington	247 km	2 April – 14 September	21 days later
Charlotte	285 km	13 April – 27 August	32 days later
Jacksonville	318 km	11 February – 10 October	29 days earlier
Greenville	326 km	23 April – 5 September	42 days later

Where to buy zucchini plants and seeds near Charleston

Buy plants ready to set out from 12 March to 3 October (from 19 February to 3 October for an unheated greenhouse); seed for raising your own is sown from 29 January to 12 September. Within 15 km of Charleston OpenStreetMap lists 7 garden centres, 5 markets and 3 farm shops (collected 20 October 2026).

Walmart Garden Center — garden centre
W ASHLEY CIR 3951, 29414-9156 Charleston · 24/7 · 15 km · walmart.com
SiteOne Landscape Supply — garden centre
Marina Drive 637, 29492 Charleston · 12 km
Charleston City Market — market
Meeting Street 188, 29401 Charleston · Mon–Sun 09:30–17:30 · 0 km · thecharlestoncitymarket.com
Charleston Farmers Market — market
Meeting Street 329, 29403 Charleston · Sat 08:00–14:00 · 1 km · charlestonfarmersmarket.com

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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