When to plant zucchini in Idaho Falls: 4 June – 28 July

In Idaho Falls, zucchini: sow for seedlings from 23 April to 7 July; plant into a greenhouse from 14 May to 28 July; plant out into open ground from 4 June to 28 July.

Zucchini 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 zucchini 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
First autumn frost	14 October, 132 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	10 July – 2 September
Days left for picking	96
Daylight	14:39 on 14 May, 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, Eggplant, Pumpkin and Watermelon.

Zucchini in Idaho Falls: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Idaho Falls during the zucchini season

About 103 mm of rain falls in the season; July is the driest month (5 mm) and October the wettest (36 mm).

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

Zucchini 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 – 9 August	16 days earlier
Boise	336 km	7 May – 10 August	28 days earlier
Helena	345 km	3 July – 17 July	29 days later
Billings	377 km	2 June – 28 July	2 days earlier
Missoula	406 km	30 June – 20 July	26 days later
Elko	425 km	20 May – 27 July	15 days earlier

Where to buy zucchini plants and seeds near Idaho Falls

Buy plants ready to set out from 4 June to 28 July (from 14 May to 28 July for an unheated greenhouse); seed for raising your own is sown from 23 April to 7 July. 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).

House Plants of Idaho Falls — garden centre
1 km
Walmart Garden Center — garden centre
4 km
Eagle Rock Nursery — plant nursery
2 km
Sunnyside Gardens — plant nursery
6 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