When to plant cucumbers in Indianapolis: 16 May – 22 August

In Indianapolis, cucumber: sow for seedlings from 28 March to 25 July; plant into a greenhouse from 25 April to 22 August; plant out into open ground from 16 May to 22 August. For plants and seeds, the places nearby include Grounded Plant + Floral Co. (garden centre, 1 km) and Cisco Seeds (farm supply, 10 km); addresses and opening hours are below.

Cucumber in Indianapolis: soil, season and weather

In Indianapolis the soil, not frost, sets the date: the last frost is over around 14 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 16 May, 32 days later.

Last spring frost	14 April
Top 7 cm of soil at 18 °C	16 May, 32 days after the last frost
Into an unheated greenhouse	25 April – 22 August; April outside: 6.2 °C at night, 17.4 °C by day; card 18–25 °C
First autumn frost	6 November, 174 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	19 June – 25 September
Days left for picking	140
Daylight	13:21 on 18 April, 14:23 on 16 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, November, has 9 rainy days

The same dates in Indianapolis hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Indianapolis: care after planting

Planted on 16 May: in the first weeks water every 4 days.

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

23 May — feed: nitrogen

Pests and diseases of cucumber 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 Indianapolis during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 29.7 °C. Months that stay below 18 °C even by day on average: November (11.3 °C). Nights average below 18 °C in May, June and September–November (2.4–17.6 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	22.9	12.4	120	14	14:21
June	28.4	17.6	89	11	14:58
July	29.7	19.8	124	13	14:44
August	28.5	18.7	88	10	13:46
September	26.2	15.9	76	7	12:30
October	19.5	9.7	82	10	11:12
November	11.3	2.4	72	9	10:01

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Indianapolis, Evansville is 11 days earlier and Fort Wayne 5 days later.

City	Distance	Date	Difference
Cincinnati	159 km	13 May – 25 August	3 days earlier
Dayton	168 km	16 May – 25 August	same day
Fort Wayne	169 km	21 May – 18 August	5 days later
Louisville	173 km	7 May – 27 August	9 days earlier
Frankfort	207 km	13 May – 19 August	3 days earlier
Evansville	233 km	5 May – 26 August	11 days earlier

Where to buy cucumber plants and seeds near Indianapolis

Buy plants ready to set out from 16 May to 22 August (from 25 April to 22 August for an unheated greenhouse); seed for raising your own is sown from 28 March to 25 July. Within 15 km of Indianapolis OpenStreetMap lists 9 garden centres, 1 farm-supply shop, 2 plant nurseries and 4 markets (collected 20 October 2026).

Grounded Plant + Floral Co. — garden centre
Mon–Sun 10:00–18:00 · 1 km
Cisco Seeds — farm supply
North Shortridge Road 602, 46219 Indianapolis · 10 km
Binford Farmers Market — market
Northview Way 6620, 46220 Indianapolis · May–Sept Sat 08:00–12:00 · 14 km · binford71.org
Viet Hua Food Market — market
Madison Avenue 8031, 46227 Indianapolis · Mon–Sun 09:00–21:00 · 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.

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