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When to plant garlic in Helena: 3 September – 5 November

In Helena, garlic: plant from 3 September to about 5 November. For planting stock, the places nearby include Keeping It Green (plant nursery, 1 km); addresses and opening hours are below.

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 Helena: soil, season and weather

Garlic goes into the ground in Helena from 3 September to about 5 November; the window opens a month before the first autumn frost. Nights then average below 0 °C in November–April; the coldest, February, averages -11.5 °C.

Planting3 September – 5 November
First autumn frost3 October
Coldest nightsFebruary, -11.5 °C
Soil back at 5 °C in spring16 April
Harvest (card)about 8 months after planting: May
Daylight13:15 on 3 September
Daylight at the winter solstice8:34

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

Garlic in Helena: care after planting

Planted on 3 September: in the first weeks water every 7 days.

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

  • 3 September — feed: nitrogen
  • 1 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 Helena, Calgary is 2 days earlier and Boise 24 days later.

CityDistanceDateDifference
Missoula155 km6 September – 12 November3 days later
Billings287 km14 September – 23 November11 days later
Idaho Falls345 km14 September – 14 November11 days later
Spokane425 km15 September – 23 November12 days later
Boise466 km27 September – end of December24 days later
Calgary517 km1 September – 26 October2 days earlier

Where to buy garlic for planting in Helena

Planting stock goes into the ground from 3 September to about 5 November; buy it before that. Within 15 km of Helena OpenStreetMap lists 2 farm-supply shops and 6 plant nurseries (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant garlic in Helena?

In Helena, garlic: plant from 3 September to about 5 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 Helena?

Last spring frost around 19 May, first autumn frost around 3 October.

Other crops in Helena, with their dates