When to plant pumpkins in Idaho Falls: 4 June – 19 June

In Idaho Falls, pumpkin: sow for seedlings from 2 April to 8 May; plant into a greenhouse from 14 May to 19 June; plant out into open ground from 4 June to 19 June.

Pumpkin 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 pumpkin card — only around 4 June, 24 days later. 132 days separate planting out (4 June) from the first autumn frost (14 October); the card's 75 days to the first harvest leave 57 for picking, so a start 8 weeks late would still fit.

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)	75
First harvest, if planted in this window	18 August – 2 September
Days left for picking	57
Daylight	13:46 on 23 April, 15:15 on 4 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 1 rainy day

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

Pumpkin 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:

25 June — feed: nitrogen

Pests and diseases of pumpkin 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 pumpkin 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

Pumpkin 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 – 1 July	16 days earlier
Boise	336 km	7 May – 2 July	28 days earlier
Helena	345 km	3 July – 20 July	29 days later
Billings	377 km	2 June – 19 June	2 days earlier
Missoula	406 km	30 June – 23 July	26 days later
Elko	425 km	20 May – 18 June	15 days earlier

Where to buy pumpkin plants and seeds near Idaho Falls

Buy plants ready to set out from 4 June to 19 June (from 14 May to 19 June for an unheated greenhouse); seed for raising your own is sown from 2 April to 8 May. 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).

C-A-L Ranch Stores — farm supply
4 km
GPOD of Idaho — farm supply
14 km
Idaho Fresh Produce — market
5 km
Blue Skies Product Dist — market
5 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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