When to plant garlic in Idaho Falls: 14 September – 14 November

In Idaho Falls, garlic: plant from 14 September to about 14 November.

Garlic is best planted early in the window: cloves planted late make smaller bulbs. Late planting works only while the soil is not frozen. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: UVM Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Garlic in Idaho Falls: soil, season and weather

Garlic goes into the ground in Idaho Falls from 14 September to about 14 November; the window opens a month before the first autumn frost. Nights then average below 0 °C in November–March; the coldest, January, averages -9.4 °C.

Planting	14 September – 14 November
First autumn frost	14 October
Coldest nights	January, -9.4 °C
Soil back at 5 °C in spring	2 April
Harvest (card)	about 8 months after planting: May
Daylight	12:36 on 14 September
Daylight at the winter solstice	8:57

The same dates in Idaho Falls hold for Tulip, Daffodil, Crocus and Hyacinth.

Garlic in Idaho Falls: care after planting

Planted on 14 September: in the first weeks water every 7 days.

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

14 September — feed: nitrogen
12 October — feed: nitrogen

Pests and diseases of garlic to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Garlic in nearby cities

Around Idaho Falls, Helena is 11 days earlier and Boise 13 days later.

City	Distance	Date	Difference
Salt Lake City	305 km	26 September – 23 December	12 days later
Boise	336 km	27 September – end of December	13 days later
Helena	345 km	3 September – 5 November	11 days earlier
Billings	377 km	14 September – 23 November	same day
Missoula	406 km	6 September – 12 November	8 days earlier
Elko	425 km	13 September – 15 November	1 day earlier

Where to buy garlic for planting in Idaho Falls

Planting stock goes into the ground from 14 September to about 14 November; buy it before that. 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
Eagle Rock Nursery — plant nursery
2 km
Sunnyside Gardens — plant nursery
6 km

Questions