When to Plant Comfrey in Colorado
Colorado spans USDA hardiness 4a to 7a (zones 4a to 7a on this page). Plant comfrey 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
Comfrey planting calendar for Colorado, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Direct sow
May 15
Projected first harvest
Jul 14
Comfrey is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Comfrey planting calendar for Colorado, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Direct sow
May 10
Projected first harvest
Jul 9
Comfrey is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Comfrey planting calendar for Colorado, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Direct sow
May 5
Projected first harvest
Jul 4
Comfrey is ready to harvest in about 60 days. Full zone 5 guide (both 5a and 5b) →
Comfrey planting calendar for Colorado, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Direct sow
Apr 30
Projected first harvest
Jun 29
Comfrey is ready to harvest in about 60 days. Full zone 5 guide (both 5a and 5b) →
Comfrey planting calendar for Colorado, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Direct sow
Apr 25
Projected first harvest
Jun 24
Comfrey is ready to harvest in about 60 days. Full zone 6 guide (both 6a and 6b) →
Comfrey planting calendar for Colorado, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Direct sow
Apr 20
Projected first harvest
Jun 19
Comfrey is ready to harvest in about 60 days. Full zone 6 guide (both 6a and 6b) →
Comfrey planting calendar for Colorado, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Direct sow
Apr 15
Projected first harvest
Jun 14
Comfrey is ready to harvest in about 60 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 comfrey in the HomeSown library. Tap any for its full grow guide.
Common problems with comfrey
What to watch for, with identification and treatment for each
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