When to Plant Sweet Grass in Idaho
Idaho spans USDA hardiness 4a to 7b (zones 4a to 7b on this page). Plant sweet grass 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
Sweet Grass planting calendar for Idaho, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Direct sow
May 29
Projected first harvest
Aug 27
Sweet Grass is ready to harvest in about 90 days. Full zone 4 guide (both 4a and 4b) →
Sweet Grass planting calendar for Idaho, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Direct sow
May 24
Projected first harvest
Aug 22
Sweet Grass is ready to harvest in about 90 days. Full zone 4 guide (both 4a and 4b) →
Sweet Grass planting calendar for Idaho, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Direct sow
May 19
Projected first harvest
Aug 17
Sweet Grass is ready to harvest in about 90 days. Full zone 5 guide (both 5a and 5b) →
Sweet Grass planting calendar for Idaho, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Direct sow
May 14
Projected first harvest
Aug 12
Sweet Grass is ready to harvest in about 90 days. Full zone 5 guide (both 5a and 5b) →
Sweet Grass planting calendar for Idaho, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Direct sow
May 9
Projected first harvest
Aug 7
Sweet Grass is ready to harvest in about 90 days. Full zone 6 guide (both 6a and 6b) →
Sweet Grass planting calendar for Idaho, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Direct sow
May 4
Projected first harvest
Aug 2
Sweet Grass is ready to harvest in about 90 days. Full zone 6 guide (both 6a and 6b) →
Sweet Grass planting calendar for Idaho, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Direct sow
Apr 29
Projected first harvest
Jul 28
Sweet Grass is ready to harvest in about 90 days. Full zone 7 guide (both 7a and 7b) →
Sweet Grass planting calendar for Idaho, Zone 7b
Average last spring frost
April 10
Average first fall frost
October 30
Direct sow
Apr 24
Projected first harvest
Jul 23
Sweet Grass is ready to harvest in about 90 days. 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
1 variety of sweet grass in the HomeSown library. Tap any for its full grow guide.
Common problems with sweet grass
What to watch for, with identification and treatment for each
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