When to plant tomatoes in Grand Island: 30 April – 7 July

In Grand Island, tomato: sow for seedlings from 16 February to 16 May; plant into a greenhouse from 9 April to 7 July; plant out into open ground from 30 April to 7 July.

Tomato in Grand Island: soil, season and weather

In Grand Island the soil, not frost, sets the date: the last frost is over around 19 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 30 April, 11 days later.

Last spring frost	19 April
Top 7 cm of soil at 15 °C	30 April, 11 days after the last frost
Into an unheated greenhouse	9 April – 7 July; April outside: 4.8 °C at night, 17.7 °C by day; card 16–27 °C
First autumn frost	27 October, 180 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	9 July – 15 September
Days left for picking	110
Daylight	11:37 on 9 March, 13:54 on 30 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 6 rainy days

Tomato in Grand Island: care after planting

Planted on 30 April: in the first weeks water every 4 days.

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

30 April — feed: balanced (NPK)
28 May — 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 Grand Island during the tomato season

Days average above the tomato card's 16–27 °C in June (29.8 °C), July (30.5 °C) and August (29.5 °C). Nights average below 16 °C in April, May and September, October (4.8–15.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	17.7	4.8	63	8	13:17
May	22.7	11.3	127	13	14:27
June	29.8	18.3	86	8	15:06
July	30.5	20	72	8	14:51
August	29.5	18.9	59	8	13:50
September	26.9	15.8	57	6	12:31
October	18.6	7.4	61	6	11:10

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Grand Island, Wichita is 17 days earlier and Sioux Falls 11 days later.

City	Distance	Date	Difference
Lincoln	143 km	23 April – 8 July	7 days earlier
Omaha	206 km	26 April – 6 July	4 days earlier
Topeka	309 km	16 April – 9 July	14 days earlier
Sioux Falls	321 km	11 May – 1 July	11 days later
Wichita	370 km	13 April – 10 July	17 days earlier
Dodge City	379 km	17 April – 9 July	13 days earlier

Where to buy tomato plants and seeds near Grand Island

Buy plants ready to set out from 30 April to 7 July (from 9 April to 7 July for an unheated greenhouse); seed for raising your own is sown from 16 February to 16 May. Within 15 km of Grand Island OpenStreetMap lists 2 garden centres (collected 28 October 2026).

Ace Hardware & Garden Center — garden centre
0 km
Walmart Garden Center — garden centre
4 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