When to plant zucchini in Columbia: 28 March – 12 September

In Columbia, zucchini: sow for seedlings from 14 February to 22 August; plant into a greenhouse from 7 March to 12 September; plant out into open ground from 28 March to 12 September.

Zucchini in Columbia: soil, season and weather

In Columbia the soil, not frost, sets the date: the last frost is over around 9 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 28 March, 19 days later.

Last spring frost	9 March
Top 7 cm of soil at 18 °C	28 March, 19 days after the last frost
First autumn frost	29 November, 246 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	3 May – 18 October
Days left for picking	210
Daylight	11:39 on 7 March, 12:24 on 28 March
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 7 rainy days

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

Zucchini in Columbia: care after planting

Planted on 28 March: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Columbia during the zucchini season

About 868 mm of rain falls in the season; November is the driest month (62 mm) and July the wettest (121 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
March	20.6	8.7	91	10	11:56
April	24.7	12.1	94	8	13:01
May	28.3	16.9	118	11	13:55
June	31.6	20.9	89	12	14:24
July	33.2	23.2	121	16	14:13
August	31.6	22.2	120	14	13:27
September	29.6	19.4	105	9	12:25
October	24.5	13.9	68	7	11:22
November	19	8.1	62	7	10:25

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Columbia, Savannah is 31 days earlier and Asheville 57 days later.

City	Distance	Date	Difference
Charlotte	138 km	13 April – 27 August	16 days later
Greenville	159 km	23 April – 5 September	26 days later
Charleston	170 km	12 March – 3 October	16 days earlier
Savannah	214 km	25 February – 7 October	31 days earlier
Athens (United States)	217 km	17 April – 5 September	20 days later
Asheville	226 km	24 May – 16 August	57 days later

Where to buy zucchini plants and seeds near Columbia

Buy plants ready to set out from 28 March to 12 September (from 7 March to 12 September for an unheated greenhouse); seed for raising your own is sown from 14 February to 22 August. Within 15 km of Columbia OpenStreetMap lists 6 garden centres, 2 farm-supply shops and 3 markets (collected 28 October 2026).

Wilson's Nursery on the market — garden centre
11 km
Appletree Landscaping & Garden Center — garden centre
15 km
Senn Brothers — farm supply
11 km
Manchester Farms — farm supply
12 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