When to plant zucchini in Missoula: 30 June – 20 July

In Missoula, zucchini: sow for seedlings from 19 May to 29 June; plant into a greenhouse from 9 June to 20 July; plant out into open ground from 30 June to 20 July.

Zucchini in Missoula: soil, season and weather

In Missoula the soil, not frost, sets the date: the last frost is over around 18 May, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 30 June, 43 days later.

Last spring frost	18 May
Top 7 cm of soil at 18 °C	30 June, 43 days after the last frost
First autumn frost	6 October, 98 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	5 August – 25 August
Days left for picking	62
Daylight	15:47 on 9 June, 15:50 on 30 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 4 rainy days

The same dates in Missoula hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Missoula: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Missoula during the zucchini season

About 195 mm of rain falls in the season; July is the driest month (11 mm) and June the wettest (63 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.1	8.4	63	10	15:51
July	28.3	12.9	11	4	15:32
August	27.3	12.1	21	4	14:15
September	21.6	7.7	42	6	12:37
October	12.6	1.5	58	11	10:57

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Missoula, Boise is 54 days earlier and Helena 3 days later.

City	Distance	Date	Difference
Helena	155 km	3 July – 17 July	3 days later
Spokane	271 km	22 May – 29 July	39 days earlier
Boise	400 km	7 May – 10 August	54 days earlier
Idaho Falls	406 km	4 June – 28 July	26 days earlier
Billings	441 km	2 June – 28 July	28 days earlier
Calgary	465 km	18 June – 15 July	12 days earlier

Where to buy zucchini plants and seeds near Missoula

Buy plants ready to set out from 30 June to 20 July (from 9 June to 20 July for an unheated greenhouse); seed for raising your own is sown from 19 May to 29 June. Within 15 km of Missoula OpenStreetMap lists 3 garden centres, 1 farm-supply shop, 2 plant nurseries, 2 markets and 6 farm shops (collected 28 October 2026).

Walmart Garden Center — garden centre
2 km
Clean Green-Lawn Tree — garden centre
8 km
Caras Nursery and Landscape — plant nursery
1 km
Fancy Plants — plant nursery
2 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