When to plant pumpkins in New Haven: 26 May – 18 July

In New Haven, pumpkin: sow for seedlings from 24 March to 6 June; plant into a greenhouse from 5 May to 18 July; plant out into open ground from 26 May to 18 July. For plants and seeds, the places nearby include Shoreline Nursery (garden centre, 7 km) and Q-Gardens (garden centre, 12 km); addresses and opening hours are below.

Pumpkin in New Haven: soil, season and weather

In New Haven the soil, not frost, sets the date: the last frost is over around 6 April, but the top 7 cm of soil reaches 18 °C — the minimum on the pumpkin card — only around 26 May, 50 days later.

Last spring frost	6 April
Top 7 cm of soil at 18 °C	26 May, 50 days after the last frost
First autumn frost	12 November, 170 days after the start
Days in the bed to the first harvest (card)	75
First harvest, if planted in this window	9 August – 1 October
Days left for picking	95
Daylight	13:15 on 14 April, 14:49 on 26 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, June, has 10 rainy days

The same dates in New Haven hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Watermelon.

Pumpkin in New Haven: care after planting

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

Feeding, by the card’s schedule from that day:

16 June — feed: nitrogen

Pests and diseases of pumpkin to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in New Haven during the pumpkin season

About 752 mm of rain falls in the season; June is the driest month (81 mm) and October the wettest (125 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.4	10.5	117	13	14:29
June	24.9	15.9	81	10	15:08
July	28.2	20.1	121	12	14:53
August	27.1	19.2	103	12	13:52
September	23.6	15.8	118	10	12:31
October	18.2	10.4	125	11	11:09
November	11.5	3.5	87	8	9:53

ERA5 2016–2025, Open-Meteo

Pumpkin in nearby cities

Around New Haven, New York is 5 days earlier and Hartford 5 days later.

City	Distance	Date	Difference
Hartford	54 km	31 May – 14 July	5 days later
New York	113 km	21 May – 26 July	5 days earlier
Providence	138 km	31 May – 14 July	5 days later
Worcester (United States)	141 km	31 May – 14 July	5 days later
Albany	164 km	30 May – 12 July	4 days later
Boston	193 km	29 May – 19 July	3 days later

Where to buy pumpkin plants and seeds near New Haven

Buy plants ready to set out from 26 May to 18 July (from 5 May to 18 July for an unheated greenhouse); seed for raising your own is sown from 24 March to 6 June. Within 15 km of New Haven OpenStreetMap lists 5 garden centres, 1 plant nursery, 1 market and 3 farm shops (collected 28 October 2026).

Shoreline Nursery — garden centre
South End Road 9, 06512 East Haven · 7 km
Q-Gardens — garden centre
Boston Post Road 1546, 06461 Milford · 12 km
Van Wilgen's Garden Center — garden centre
Valley Road 51, 06471 North Branford · 13 km
Shelton Farmer's Market — market
Canal Street East 100, 06484 Shelton · 14 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