When to plant tomatoes in Buffalo: 20 May – 21 July

In Buffalo, tomato: sow for seedlings from 8 March to 30 May; plant into a greenhouse from 29 April to 21 July; plant out into open ground from 20 May to 21 July. For plants and seeds, the places nearby include Urban Roots Garden Center (garden centre, 3 km) and Daddy's Plants (garden centre, 4 km); addresses and opening hours are below.

Tomato in Buffalo: soil, season and weather

In Buffalo the soil, not frost, sets the date: the last frost is over around 24 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 20 May, 26 days later.

Last spring frost	24 April
Top 7 cm of soil at 15 °C	20 May, 26 days after the last frost
Into an unheated greenhouse	29 April – 21 July; April outside: 2.9 °C at night, 12.5 °C by day; card 16–27 °C
First autumn frost	10 November, 174 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	29 July – 29 September
Days left for picking	104
Daylight	12:33 on 29 March, 14:48 on 20 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 9 rainy days

Tomato in Buffalo: care after planting

Planted on 20 May: in the first weeks water every 4 days.

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

20 May — feed: balanced (NPK)
17 June — feed: nitrogen

Pests and diseases of tomato 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 Buffalo during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 26.7 °C. Months that stay below 16 °C even by day on average: November (8.7 °C). Nights average below 16 °C in May, June and September–November (2.2–15.3 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.1	9.4	83	12	14:38
June	24.1	15.3	84	11	15:20
July	26.7	18.7	98	13	15:03
August	25.7	18.1	94	13	13:58
September	22.9	14.9	73	9	12:33
October	16.2	9.1	103	13	11:06
November	8.7	2.2	83	12	9:46

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Buffalo, Hamilton is 1 day earlier and Kitchener 2 days later.

City	Distance	Date	Difference
Hamilton	88 km	19 May – 18 July	1 day earlier
Toronto	94 km	20 May – 10 July	same day
Rochester	106 km	20 May – 23 July	same day
Erie	130 km	20 May – 30 July	same day
Kitchener	145 km	22 May – 6 July	2 days later
London (Canada)	192 km	19 May – 18 July	1 day earlier

Where to buy tomato plants and seeds near Buffalo

Buy plants ready to set out from 20 May to 21 July (from 29 April to 21 July for an unheated greenhouse); seed for raising your own is sown from 8 March to 30 May. Within 15 km of Buffalo OpenStreetMap lists 10 garden centres and 3 markets (collected 20 October 2026).

Gullo's Garden Center — garden centre
Southwestern Boulevard 4767, 14075 Hamburg · Mon–Sat 08:00–18:00; Sun 09:00–17:00 · 15 km · gullosgc.com
Elbers Landscape Service — garden centre
Main Street 2918, 14214 Buffalo · 7 km · elberslandscape.com
Daddy's Plants — garden centre
Niagara Street 1250, 14213 Buffalo · 4 km · daddysplants.com
Urban Roots Garden Center — garden centre
Rhode Island Street 428, 14213 Buffalo · 3 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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