When to plant zucchini in Pittsburgh: 26 May – 23 August

In Pittsburgh, zucchini: sow for seedlings from 14 April to 2 August; plant into a greenhouse from 5 May to 23 August; plant out into open ground from 26 May to 23 August.

Zucchini in Pittsburgh: soil, season and weather

In Pittsburgh the soil, not frost, sets the date: the last frost is over around 19 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 26 May, 37 days later.

Last spring frost	19 April
Top 7 cm of soil at 18 °C	26 May, 37 days after the last frost
First autumn frost	9 November, 167 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	1 July – 28 September
Days left for picking	131
Daylight	14:04 on 5 May, 14:43 on 26 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 10 rainy days

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

Zucchini in Pittsburgh: care after planting

Planted on 26 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Pittsburgh during the zucchini season

About 841 mm of rain falls in the season; November is the driest month (79 mm) and June the wettest (158 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.4	11	152	16	14:25
June	26.1	15.9	158	16	15:03
July	28.7	18.6	122	15	14:48
August	27.5	17.7	114	14	13:48
September	24.7	14.6	103	11	12:30
October	18.2	8.8	113	11	11:11
November	10.6	2	79	10	9:58

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Pittsburgh, Charleston, West Virginia is 11 days earlier and Erie 4 days later.

City	Distance	Date	Difference
Cleveland	185 km	28 May – 4 September	2 days later
Erie	188 km	30 May – 2 September	4 days later
Hagerstown	213 km	23 May – 25 August	3 days earlier
Columbus	260 km	20 May – 16 August	6 days earlier
Harrisburg	265 km	25 May – 25 August	1 day earlier
Charleston, West Virginia	271 km	15 May – 21 August	11 days earlier

Where to buy zucchini plants and seeds near Pittsburgh

Buy plants ready to set out from 26 May to 23 August (from 5 May to 23 August for an unheated greenhouse); seed for raising your own is sown from 14 April to 2 August. Within 15 km of Pittsburgh OpenStreetMap lists 11 garden centres, 4 plant nurseries, 23 markets and 4 farm shops (collected 20 October 2026).

Argyle Studio — market
Forbes Avenue 3608, 15213 Pittsburgh · Tue 11:00–18:00, Wed–Fri 12:00–18:00, Sat 11:00–17:00 · 4 km
Carrick Farmers Market — market
Brownsville Road 1529, Pittsburgh · Jun 19–Nov 20 Wed 15:00–19:00 · 5 km
Lawrenceville Farmers Market — market
41st Street 115, 15201 Pittsburgh · May 21–Nov 26 Tue 15:00–19:00 · 5 km
Northside Farmers Market — market
May 24–Nov 22 Fri 15:00–19:00 · 2 km · pittsburghpa.gov

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