When to Plant Amaranth in California
California spans USDA hardiness 5b to 11a (zones 5b to 11a on this page). Plant amaranth by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 5b · Zone 6a · Zone 6b · Zone 7a · Zone 7b · Zone 8a · Zone 8b · Zone 9a · Zone 9b · Zone 10a · Zone 10b · Zone 11a
Amaranth planting calendar for California, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Direct sow
May 7
Projected first harvest
Jun 26
Amaranth is ready to harvest in about 50 days. Full zone 5 guide (both 5a and 5b) →
Amaranth planting calendar for California, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Direct sow
May 2
Projected first harvest
Jun 21
Amaranth is ready to harvest in about 50 days. Full zone 6 guide (both 6a and 6b) →
Amaranth planting calendar for California, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Direct sow
Apr 27
Projected first harvest
Jun 16
Amaranth is ready to harvest in about 50 days. Full zone 6 guide (both 6a and 6b) →
Amaranth planting calendar for California, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Direct sow
Apr 22
Projected first harvest
Jun 11
Amaranth is ready to harvest in about 50 days. Full zone 7 guide (both 7a and 7b) →
Amaranth planting calendar for California, Zone 7b
Average last spring frost
April 10
Average first fall frost
October 30
Direct sow
Apr 17
Projected first harvest
Jun 6
Amaranth is ready to harvest in about 50 days. Full zone 7 guide (both 7a and 7b) →
Amaranth planting calendar for California, Zone 8a
Average last spring frost
April 1
Average first fall frost
November 10
Direct sow
Apr 8
Projected first harvest
May 28
Amaranth is ready to harvest in about 50 days. Full zone 8 guide (both 8a and 8b) →
Amaranth planting calendar for California, Zone 8b
Average last spring frost
March 20
Average first fall frost
November 20
Direct sow
Mar 27
Projected first harvest
May 16
Amaranth is ready to harvest in about 50 days. Full zone 8 guide (both 8a and 8b) →
Amaranth planting calendar for California, Zone 9a
Average last spring frost
March 1
Average first fall frost
December 1
Direct sow
Mar 8
Projected first harvest
Apr 27
Amaranth is ready to harvest in about 50 days. Full zone 9 guide (both 9a and 9b) →
Amaranth planting calendar for California, Zone 9b
Average last spring frost
February 15
Average first fall frost
December 15
Direct sow
Feb 22
Projected first harvest
Apr 13
Amaranth is ready to harvest in about 50 days. Full zone 9 guide (both 9a and 9b) →
Amaranth planting calendar for California, Zone 10a
Average last spring frost
January 30
Average first fall frost
December 30
Direct sow
Feb 6
Projected first harvest
Mar 28
Amaranth is ready to harvest in about 50 days. Full zone 10 guide (both 10a and 10b) →
Amaranth planting calendar for California, Zone 10b
Average last spring frost
January 30
Average first fall frost
December 30
Direct sow
Feb 6
Projected first harvest
Mar 28
Amaranth is ready to harvest in about 50 days. Full zone 10 guide (both 10a and 10b) →
Amaranth planting calendar for California, Zone 11a
Zone 11a doesn't get a seasonal frost — amaranth plants on a warm/cool-season calendar instead of frost dates.
Best planting window
Year-round
Time to harvest
~50 days
🌴 Your zone never frosts, so planting is timed to the cooler vs. warmer seasons rather than a frost date.
Amaranth is ready to harvest in about 50 days.
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 amaranth in the HomeSown library. Tap any for its full grow guide.
Common problems with amaranth
What to watch for, with identification and treatment for each
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