When to plant zucchini in Baltimore: 5 May – 5 September

In Baltimore, zucchini: sow for seedlings from 24 March to 15 August; plant into a greenhouse from 14 April to 5 September; plant out into open ground from 5 May to 5 September.

Zucchini in Baltimore: soil, season and weather

In Baltimore the soil, not frost, sets the date: the last frost is over around 31 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 5 May, 35 days later.

Last spring frost	31 March
Top 7 cm of soil at 18 °C	5 May, 35 days after the last frost
First autumn frost	22 November, 201 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	10 June – 11 October
Days left for picking	165
Daylight	13:10 on 14 April, 13:59 on 5 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 8 rainy days

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

Zucchini in Baltimore: care after planting

Planted on 5 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Baltimore during the zucchini season

About 991 mm of rain falls in the season; November is the driest month (88 mm) and July the wettest (191 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.9	13.9	163	14	14:19
June	27.3	19.2	139	13	14:55
July	30	22.5	191	16	14:41
August	28.5	21.4	162	13	13:44
September	25.5	18.4	146	11	12:29
October	19.7	12.4	102	9	11:13
November	13.1	5.6	88	8	10:03

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Baltimore, Washington, D.C. is 1 day earlier and Harrisburg 20 days later.

City	Distance	Date	Difference
Annapolis	37 km	8 May – 2 September	3 days later
Washington, D.C.	56 km	4 May – 30 August	1 day earlier
Dover	95 km	11 May – 9 September	6 days later
Hagerstown	104 km	23 May – 25 August	18 days later
Harrisburg	111 km	25 May – 25 August	20 days later
Philadelphia	144 km	14 May – 25 August	9 days later

Where to buy zucchini plants and seeds near Baltimore

Buy plants ready to set out from 5 May to 5 September (from 14 April to 5 September for an unheated greenhouse); seed for raising your own is sown from 24 March to 15 August. Within 15 km of Baltimore OpenStreetMap lists 8 garden centres, 4 plant nurseries, 20 markets and 3 farm shops (collected 20 October 2026).

Swadesh — market
Belair Road 8643, 21236 Nottingham · 15 km
University of Maryland Medical Center Farmers Market — market
Tue 10:30–14:30 · 1 km
Johns Hopkins Hospital Farmers Market — market
May–Oct: Thu 10:00–14:00 · 1 km
Fells Point Farmers Market — market
Jun–Oct: Sat 07:30–12:30 · 2 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