When to Plant Rhubarb in California
California spans USDA hardiness 5b to 11a (zones 5b to 11a on this page). Plant rhubarb 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
Rhubarb planting calendar for California, Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Direct sow
Apr 30
Projected first harvest
May 14
Most rhubarb mature in about 14 days. Full zone 5 guide (both 5a and 5b) →
Rhubarb planting calendar for California, Zone 6a
Average last spring frost
April 25
Average first fall frost
October 10
Direct sow
Apr 25
Projected first harvest
May 9
Most rhubarb mature in about 14 days. Full zone 6 guide (both 6a and 6b) →
Rhubarb planting calendar for California, Zone 6b
Average last spring frost
April 20
Average first fall frost
October 15
Direct sow
Apr 20
Projected first harvest
May 4
Most rhubarb mature in about 14 days. Full zone 6 guide (both 6a and 6b) →
Rhubarb planting calendar for California, Zone 7a
Average last spring frost
April 15
Average first fall frost
October 20
Direct sow
Apr 15
Projected first harvest
Apr 29
Most rhubarb mature in about 14 days. Full zone 7 guide (both 7a and 7b) →
Rhubarb planting calendar for California, Zone 7b
Average last spring frost
April 10
Average first fall frost
October 30
Direct sow
Apr 10
Projected first harvest
Apr 24
Most rhubarb mature in about 14 days. Full zone 7 guide (both 7a and 7b) →
Rhubarb planting calendar for California, Zone 8a
Average last spring frost
April 1
Average first fall frost
November 10
Direct sow
Apr 1
Projected first harvest
Apr 15
Most rhubarb mature in about 14 days. Full zone 8 guide (both 8a and 8b) →
Rhubarb planting calendar for California, Zone 8b
Average last spring frost
March 20
Average first fall frost
November 20
Direct sow
Mar 20
Projected first harvest
Apr 3
Most rhubarb mature in about 14 days. Full zone 8 guide (both 8a and 8b) →
Rhubarb planting calendar for California, Zone 9a
Average last spring frost
March 1
Average first fall frost
December 1
Direct sow
Mar 1
Projected first harvest
Mar 15
Most rhubarb mature in about 14 days. Full zone 9 guide (both 9a and 9b) →
Rhubarb planting calendar for California, Zone 9b
Average last spring frost
February 15
Average first fall frost
December 15
Direct sow
Feb 15
Projected first harvest
Mar 1
Most rhubarb mature in about 14 days. Full zone 9 guide (both 9a and 9b) →
Rhubarb planting calendar for California, Zone 10a
Average last spring frost
January 30
Average first fall frost
December 30
Direct sow
Jan 30
Projected first harvest
Feb 13
Most rhubarb mature in about 14 days. Full zone 10 guide (both 10a and 10b) →
Rhubarb planting calendar for California, Zone 10b
Average last spring frost
January 30
Average first fall frost
December 30
Direct sow
Jan 30
Projected first harvest
Feb 13
Most rhubarb mature in about 14 days. Full zone 10 guide (both 10a and 10b) →
Rhubarb planting calendar for California, Zone 11a
Zone 11a doesn't get a seasonal frost — rhubarb plants on a warm/cool-season calendar instead of frost dates.
Best planting window
Year-round
🌴 Your zone never frosts, so planting is timed to the cooler vs. warmer seasons rather than a frost date.
Most rhubarb mature in about 14 days.
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 rhubarb in the HomeSown library. Tap any for its full grow guide.
Common problems with rhubarb
What to watch for, with identification and treatment for each
🌱 Grow rhubarb with a calendar built for your exact yard
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