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When to plant garlic in Flagstaff: 21 September – end of December

In Flagstaff, garlic: plant from 21 September to the end of December.

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 average daily temperature here falls below 0 °C only in January; the sources go no later than December. Sources: UVM Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Garlic in Flagstaff: soil, season and weather

Garlic goes into the ground in Flagstaff from 21 September to the end of December; the window opens a month before the first autumn frost. Nights then average below 0 °C in December–March; the coldest, January, averages -5 °C.

Planting21 September – end of December
First autumn frost21 October
Coldest nightsJanuary, -5 °C
Soil back at 5 °C in spring4 March
Harvest (card)about 8 months after planting: May
Daylight12:13 on 21 September
Daylight at the winter solstice9:47

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

Garlic in Flagstaff: care after planting

Planted on 21 September: in the first weeks water every 7 days.

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

  • 21 September — feed: nitrogen
  • 19 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

All the nearest cities on our list plant garlic later than Flagstaff; the closest date is in Yuma, 10 days later.

CityDistanceDateDifference
Phoenix197 kmby 29 November69 days later
Tucson335 kmby 18 November58 days later
Las Vegas336 km12 November – end of December52 days later
Yuma390 km1 October10 days later
Albuquerque452 km10 October – end of December19 days later
Mexicali453 km1 October10 days later

Where to buy garlic for planting in Flagstaff

Planting stock goes into the ground from 21 September to the end of December; buy it before that. Within 15 km of Flagstaff OpenStreetMap lists 1 plant nursery and 1 market (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant garlic in Flagstaff?

In Flagstaff, garlic: plant from 21 September to the end of December. 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 Flagstaff?

Last spring frost around 5 May, first autumn frost around 21 October.

Other crops in Flagstaff, with their dates