When to Plant Lemon Basil in Colorado
Colorado spans USDA hardiness 4a to 7a (zones 4a to 7a on this page). Plant lemon basil 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
Lemon Basil planting calendar for Colorado, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Start seeds indoors
Apr 3
Transplant outdoors
May 29
Projected first harvest
Aug 2
Lemon Basil is ready to harvest in about 65 days. Full zone 4 guide (both 4a and 4b) →
Lemon Basil planting calendar for Colorado, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Start seeds indoors
Mar 29
Transplant outdoors
May 24
Projected first harvest
Jul 28
Lemon Basil is ready to harvest in about 65 days. Full zone 4 guide (both 4a and 4b) →
Lemon Basil planting calendar for Colorado, Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Start seeds indoors
Mar 24
Transplant outdoors
May 19
Projected first harvest
Jul 23
Lemon Basil is ready to harvest in about 65 days. Full zone 5 guide (both 5a and 5b) →
Lemon Basil planting calendar for Colorado, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Start seeds indoors
Mar 19
Transplant outdoors
May 14
Projected first harvest
Jul 18
Lemon Basil is ready to harvest in about 65 days. Full zone 5 guide (both 5a and 5b) →
Lemon Basil planting calendar for Colorado, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Start seeds indoors
Mar 14
Transplant outdoors
May 9
Projected first harvest
Jul 13
Lemon Basil is ready to harvest in about 65 days. Full zone 6 guide (both 6a and 6b) →
Lemon Basil planting calendar for Colorado, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Start seeds indoors
Mar 9
Transplant outdoors
May 4
Projected first harvest
Jul 8
Lemon Basil is ready to harvest in about 65 days. Full zone 6 guide (both 6a and 6b) →
Lemon Basil planting calendar for Colorado, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Start seeds indoors
Mar 4
Transplant outdoors
Apr 29
Projected first harvest
Jul 3
Lemon Basil is ready to harvest in about 65 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 lemon basil in the HomeSown library. Tap any for its full grow guide.
Common problems with lemon basil
What to watch for, with identification and treatment for each
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