When to plant watermelons in Erie: 30 May – 10 August

In Erie, watermelon: sow for seedlings from 11 April to 13 July; plant into a greenhouse from 9 May to 10 August; plant out into open ground from 30 May to 10 August. For plants and seeds, the places nearby include The Garden House (garden centre, 3 km) and Stan's Garden Center (garden centre, 8 km); addresses and opening hours are below.

Watermelon in Erie: soil, season and weather

In Erie the soil, not frost, sets the date: the last frost is over around 10 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 30 May, 50 days later.

Last spring frost	10 April
Top 7 cm of soil at 18 °C	30 May, 50 days after the last frost
Into an unheated greenhouse	9 May – 10 August; May outside: 11.1 °C at night, 18.2 °C by day; card 18–35 °C
First autumn frost	19 November, 173 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	28 July – 8 October
Days left for picking	114
Daylight	14:04 on 2 May, 14:59 on 30 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 12 rainy days

The same dates in Erie hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Erie: care after planting

Planted on 30 May: in the first weeks water every 5 days.

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

30 May — feed: balanced (NPK)

Pests and diseases of watermelon 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 Erie during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 26.1 °C. Months that stay below 18 °C even by day on average: October (17 °C) and November (9.7 °C). Nights average below 18 °C in May, June and September–November (4.1–16.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.2	11.1	104	13	14:33
June	23.5	16.9	101	12	15:14
July	26.1	19.9	107	13	14:58
August	25.2	19.2	112	15	13:55
September	22.6	16.4	88	12	12:32
October	17	10.8	147	16	11:08
November	9.7	4.1	122	17	9:50

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Erie, Cleveland is 2 days earlier and Hamilton 2 days later.

City	Distance	Date	Difference
Hamilton	126 km	1 June – 29 July	2 days later
Buffalo	130 km	29 May – 1 August	1 day earlier
London (Canada)	133 km	29 May – 29 July	1 day earlier
Kitchener	149 km	31 May – 17 July	1 day later
Cleveland	151 km	28 May – 12 August	2 days earlier
Toronto	178 km	29 May – 21 July	1 day earlier

Where to buy watermelon plants and seeds near Erie

Buy plants ready to set out from 30 May to 10 August (from 9 May to 10 August for an unheated greenhouse); seed for raising your own is sown from 11 April to 13 July. Within 15 km of Erie OpenStreetMap lists 4 garden centres and 2 farm shops (collected 29 October 2026).

The Garden House — garden centre
East 20th Street 1424, 16503 Erie · 3 km
Stan's Garden Center — garden centre
Buffalo Road 5001, 16510 Erie · 8 km
Lowe's Garden Center — garden centre
Asbury Road 2305, 16506 Erie · 11 km
Stan's Garden Center — garden centre
West Lake Road 5341, 16505 Erie · 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.

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