When to plant eggplants in Idaho Falls: 4 June – 24 June

In Idaho Falls, eggplant: sow for seedlings from 15 March to 25 April; plant into a greenhouse from 14 May to 24 June; plant out into open ground from 4 June to 24 June. For plants and seeds, the places nearby include Town and Country Gardens (garden centre, 7 km) and R & D Wholesale Nursery (garden centre, 8 km); addresses and opening hours are below.

Eggplant in Idaho Falls: soil, season and weather

In Idaho Falls the soil, not frost, sets the date: the last frost is over around 11 May, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 4 June, 24 days later.

Last spring frost	11 May
Top 7 cm of soil at 18 °C	4 June, 24 days after the last frost
Into an unheated greenhouse	14 May – 24 June; May outside: 5.5 °C at night, 20.6 °C by day; card 21–29 °C
First autumn frost	14 October, 132 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	13 August – 2 September
Days left for picking	62
Daylight	12:55 on 5 April, 15:15 on 4 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 1 rainy day

The same dates in Idaho Falls hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Idaho Falls: care after planting

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

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

4 June — feed: balanced (NPK)
2 July — feed: nitrogen

Pests and diseases of eggplant 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 Idaho Falls during the eggplant season

Days average above the eggplant card's 21–29 °C in July (32.9 °C) and August (30.9 °C). Months that stay below 21 °C even by day on average: October (15.3 °C). Nights average below 21 °C in every month of the season, from 2.4 °C to 15.7 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	27.3	11.2	21	5	15:24
July	32.9	15.7	5	1	15:07
August	30.9	14.2	14	3	14:00
September	25.2	9.5	27	5	12:33
October	15.3	2.4	36	7	11:05

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Idaho Falls, Boise is 28 days earlier and Helena 29 days later.

City	Distance	Date	Difference
Salt Lake City	305 km	19 May – 6 July	16 days earlier
Boise	336 km	7 May – 7 July	28 days earlier
Helena	345 km	3 July – 25 July	29 days later
Billings	377 km	2 June – 24 June	2 days earlier
Missoula	406 km	30 June – 28 July	26 days later
Elko	425 km	20 May – 23 June	15 days earlier

Where to buy eggplant plants and seeds near Idaho Falls

Buy plants ready to set out from 4 June to 24 June (from 14 May to 24 June for an unheated greenhouse); seed for raising your own is sown from 15 March to 25 April. Within 15 km of Idaho Falls OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 2 plant nurseries, 2 markets and 1 farm shop (collected 28 October 2026).

Town and Country Gardens — garden centre
South Yellowstone Highway 5800, 83402 Idaho Falls · 7 km · tcgardens.com
R & D Wholesale Nursery — garden centre
West Heritage Circle 2312, 83402 Idaho Falls · 8 km
Siems Enterprises LLC — farm supply
Mon, Thu, Fri 08:00–17:00; Tue 08:00–16:15; Wed 08:00–15:00; Sat 09:00–12:00 · 15 km
Itty Bitty Farms — farm shop
East Lincoln Road 5229, 83401-5769 Idaho Falls · 8 km · ittybittyfarmstore.com

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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