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When to plant garlic in Missoula: 6 September – 12 November

In Missoula, garlic: plant from 6 September to about 12 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 Missoula: soil, season and weather

Garlic goes into the ground in Missoula from 6 September to about 12 November; the window opens a month before the first autumn frost. Nights then average below 0 °C in November–April; the coldest, February, averages -8.7 °C.

Planting6 September – 12 November
First autumn frost6 October
Coldest nightsFebruary, -8.7 °C
Soil back at 5 °C in spring13 April
Harvest (card)about 8 months after planting: May
Daylight13:06 on 6 September
Daylight at the winter solstice8:32

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

Garlic in Missoula: care after planting

Planted on 6 September: in the first weeks water every 7 days.

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

  • 6 September — feed: nitrogen
  • 4 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 Missoula, Calgary is 5 days earlier and Boise 21 days later.

CityDistanceDateDifference
Helena155 km3 September – 5 November3 days earlier
Spokane271 km15 September – 23 November9 days later
Boise400 km27 September – end of December21 days later
Idaho Falls406 km14 September – 14 November8 days later
Billings441 km14 September – 23 November8 days later
Calgary465 km1 September – 26 October5 days earlier

Where to buy garlic for planting in Missoula

Planting stock goes into the ground from 6 September to about 12 November; buy it before that. 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).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant garlic in Missoula?

In Missoula, garlic: plant from 6 September to about 12 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.

When is the last spring frost in Missoula?

Last spring frost around 18 May, first autumn frost around 6 October.

Other crops in Missoula, with their dates