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When to Plant Garlic in Montana

Montana spans USDA hardiness 3b to 6b (zones 3b to 6b on this page). Plant garlic by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.

Jump to: Zone 3b · Zone 4a · Zone 4b · Zone 5a · Zone 5b · Zone 6a · Zone 6b

Garlic planting calendar for Montana, Zone 3b

Average last spring frost

May 20

Average first fall frost

September 15

🌿

Direct sow

Nov 19

🌾

Projected first harvest

Jul 17

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 3b (approximate)

Most garlic mature in about 240 days. Full zone 3 guide (both 3a and 3b) →

Garlic planting calendar for Montana, Zone 4a

Average last spring frost

May 15

Average first fall frost

September 20

🌿

Direct sow

Nov 14

🌾

Projected first harvest

Jul 12

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 4a (approximate)

Most garlic mature in about 240 days. Full zone 4 guide (both 4a and 4b) →

Garlic planting calendar for Montana, Zone 4b

Average last spring frost

May 10

Average first fall frost

September 25

🌿

Direct sow

Nov 9

🌾

Projected first harvest

Jul 7

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 4b (approximate)

Most garlic mature in about 240 days. Full zone 4 guide (both 4a and 4b) →

Garlic planting calendar for Montana, Zone 5a

Average last spring frost

May 5

Average first fall frost

October 1

🌿

Direct sow

Nov 4

🌾

Projected first harvest

Jul 2

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 5a (approximate)

Most garlic mature in about 240 days. Full zone 5 guide (both 5a and 5b) →

Garlic planting calendar for Montana, Zone 5b

Average last spring frost

April 30

Average first fall frost

October 5

🌿

Direct sow

Oct 30

🌾

Projected first harvest

Jun 27

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 5b (approximate)

Most garlic mature in about 240 days. Full zone 5 guide (both 5a and 5b) →

Garlic planting calendar for Montana, Zone 6a

Average last spring frost

April 25

Average first fall frost

October 10

🌿

Direct sow

Oct 25

🌾

Projected first harvest

Jun 22

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6a (approximate)

Most garlic mature in about 240 days. Full zone 6 guide (both 6a and 6b) →

Garlic planting calendar for Montana, Zone 6b

Average last spring frost

April 20

Average first fall frost

October 15

🌿

Direct sow

Oct 20

🌾

Projected first harvest

Jun 17

J
F
M
A
M
J
J
A
S
O
N
D
🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6b (approximate)

Most garlic mature in about 240 days. Full zone 6 guide (both 6a and 6b) →

Not sure which half-zone you're in? Set your ZIP in HomeSown for dates tuned to your exact location.

Varieties to grow

6 varieties of garlic in the HomeSown library. Tap any for its full grow guide.

German Extra Hardy Garlic →Inchelium Red Garlic →Killarney Red Garlic →Music Hardneck Garlic →Softneck Garlic →Spanish Roja Garlic →

Common problems with garlic

What to watch for, with identification and treatment for each

Leek MothOnion MaggotBulb MiteGroundhogsAntsAphidsPink RootBotrytis Neck RotFusarium Basal RotWhite RotBulb RotBolting

🌱 Grow garlic with a calendar built for your exact yard

HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.

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garlic — full zone guide

All zonesZone 3 →Zone 4 →Zone 5 →Zone 6 →