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When to Plant Collard Greens in Idaho

Idaho spans USDA hardiness 4a to 7b (zones 4a to 7b on this page). Plant collard greens by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.

Jump to: Zone 4a · Zone 4b · Zone 5a · Zone 5b · Zone 6a · Zone 6b · Zone 7a · Zone 7b

Collard Greens planting calendar for Idaho, Zone 4a

Average last spring frost

May 15

Average first fall frost

September 20

spring planting

🌱

Start seeds indoors

Mar 20

🌿

Transplant outdoors

May 1

🌾

Projected first harvest

Jul 15

fall planting

🌱

Start seeds indoors

Jun 7

🌿

Transplant outdoors

Jul 12

🌾

Projected first harvest

Sep 25

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 4a (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 4 guide (both 4a and 4b) →

Collard Greens planting calendar for Idaho, Zone 4b

Average last spring frost

May 10

Average first fall frost

September 25

spring planting

🌱

Start seeds indoors

Mar 15

🌿

Transplant outdoors

Apr 26

🌾

Projected first harvest

Jul 10

fall planting

🌱

Start seeds indoors

Jun 12

🌿

Transplant outdoors

Jul 17

🌾

Projected first harvest

Sep 30

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 4b (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 4 guide (both 4a and 4b) →

Collard Greens planting calendar for Idaho, Zone 5a

Average last spring frost

May 5

Average first fall frost

October 1

spring planting

🌱

Start seeds indoors

Mar 10

🌿

Transplant outdoors

Apr 21

🌾

Projected first harvest

Jul 5

fall planting

🌱

Start seeds indoors

Jun 18

🌿

Transplant outdoors

Jul 23

🌾

Projected first harvest

Oct 6

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 5a (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 5 guide (both 5a and 5b) →

Collard Greens planting calendar for Idaho, Zone 5b

Average last spring frost

April 30

Average first fall frost

October 5

spring planting

🌱

Start seeds indoors

Mar 5

🌿

Transplant outdoors

Apr 16

🌾

Projected first harvest

Jun 30

fall planting

🌱

Start seeds indoors

Jun 22

🌿

Transplant outdoors

Jul 27

🌾

Projected first harvest

Oct 10

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 5b (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 5 guide (both 5a and 5b) →

Collard Greens planting calendar for Idaho, Zone 6a

Average last spring frost

April 25

Average first fall frost

October 10

spring planting

🌱

Start seeds indoors

Feb 28

🌿

Transplant outdoors

Apr 11

🌾

Projected first harvest

Jun 25

fall planting

🌱

Start seeds indoors

Jun 27

🌿

Transplant outdoors

Aug 1

🌾

Projected first harvest

Oct 15

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6a (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 6 guide (both 6a and 6b) →

Collard Greens planting calendar for Idaho, Zone 6b

Average last spring frost

April 20

Average first fall frost

October 15

spring planting

🌱

Start seeds indoors

Feb 23

🌿

Transplant outdoors

Apr 6

🌾

Projected first harvest

Jun 20

fall planting

🌱

Start seeds indoors

Jul 2

🌿

Transplant outdoors

Aug 6

🌾

Projected first harvest

Oct 20

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 6b (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 6 guide (both 6a and 6b) →

Collard Greens planting calendar for Idaho, Zone 7a

Average last spring frost

April 15

Average first fall frost

October 20

spring planting

🌱

Start seeds indoors

Feb 18

🌿

Transplant outdoors

Apr 1

🌾

Projected first harvest

Jun 15

fall planting

🌱

Start seeds indoors

Jul 7

🌿

Transplant outdoors

Aug 11

🌾

Projected first harvest

Oct 25

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 7a (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 7 guide (both 7a and 7b) →

Collard Greens planting calendar for Idaho, Zone 7b

Average last spring frost

April 10

Average first fall frost

October 30

spring planting

🌱

Start seeds indoors

Feb 13

🌿

Transplant outdoors

Mar 27

🌾

Projected first harvest

Jun 10

fall planting

🌱

Start seeds indoors

Jul 17

🌿

Transplant outdoors

Aug 21

🌾

Projected first harvest

Nov 4

J
F
M
A
M
J
J
A
S
O
N
D

spring planting

fall planting

🌱 Start indoors🌿 Growing outside🌾 HarvestTodayZone 7b (approximate)

Most collard greens mature in about 60 to 75 days depending on the variety. Full zone 7 guide (both 7a and 7b) →

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

Varieties to grow

2 varieties of collard greens in the HomeSown library. Tap any for its full grow guide.

Champion Collards →Collard Greens →

Common problems with collard greens

What to watch for, with identification and treatment for each

Cabbage MaggotCabbage Root MaggotDiamondback MothHarlequin BugCabbage WormsCabbage LooperClubrootBlack RotBoron DeficiencyBoltingBacterial Soft RotAlternaria Leaf Spot

🌱 Grow collard greens 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.

Start your free garden →

collard greens — full zone guide

All zonesZone 4 →Zone 5 →Zone 6 →Zone 7 →