When to Plant Yarrow in California

Achillea millefolium (Yarrow) is a tough, drought-tolerant native perennial with aromatic finely-divided foliage and broad flat-topped flower clusters that serve as a landing platform for hundreds of beneficial insect species. Available in white (the species type) and a wide range of cultivars spanning yellow, gold, pink, salmon, and deep red. Spreads by rhizome to form ground-covering colonies; blooms from late spring through midsummer with reblooming into fall if deadheaded. Exceptional in hot, dry sites where other perennials fail.

California spans USDA hardiness zones 6b, 7a, 7b, 8a, 8b, 9a, 9b (with planting data available), so planting dates vary by your location within the state. Click your zone below for the most accurate dates.

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Click your county for exact Yarrow planting dates based on your local frost dates.

Hover over a county to see details. Click to view planting guide.

Yarrow Planting Calendar for California

▸ Zone 6b ~205 day growing season · Full guide →

Last frost: April 3 · First frost: October 25 · 205 day season

Activity	When	Date Range
Start Indoors	January 30	Jan 30 – Feb 13
Transplant Outdoors	April 10	Apr 10 – Apr 24
Direct Sow	April 3	Apr 3 – Apr 24
Bloom	June 19	Jun 19 – Oct 16

▸ Zone 7a ~221 day growing season · Full guide →

Last frost: March 25 · First frost: November 1 · 221 day season

Activity	When	Date Range
Start Indoors	January 21	Jan 21 – Feb 4
Transplant Outdoors	April 1	Apr 1 – Apr 15
Direct Sow	March 25	Mar 25 – Apr 15
Bloom	June 3	Jun 3 – Oct 14

▸ Zone 7b ~235 day growing season · Full guide →

Last frost: March 18 · First frost: November 8 · 235 day season

Activity	When	Date Range
Start Indoors	January 14	Jan 14 – Jan 28
Transplant Outdoors	March 25	Mar 25 – Apr 8
Direct Sow	March 11	Mar 11 – Apr 1
Bloom	May 27	May 27 – Oct 14

▸ Zone 8a ~255 day growing season · Full guide →

Last frost: March 8 · First frost: November 18 · 255 day season

Activity	When	Date Range
Start Indoors	January 11	Jan 11 – Jan 25
Transplant Outdoors	March 8	Mar 8 – Mar 22
Direct Sow	March 1	Mar 1 – Mar 22
Bloom	May 10	May 10 – Oct 4

▸ Zone 8b ~276 day growing season · Full guide →

Last frost: February 25 · First frost: November 28 · 276 day season

Activity	When	Date Range
Start Indoors	December 31	Dec 31 – Jan 14
Transplant Outdoors	February 25	Feb 25 – Mar 11
Direct Sow	February 11	Feb 11 – Mar 4
Bloom	April 29	Apr 29 – Sep 23

▸ Zone 9a ~303 day growing season · Full guide →

Last frost: February 10 · First frost: December 10 · 303 day season

Activity	When	Date Range
Start Indoors	December 16	Dec 16 – Dec 30
Transplant Outdoors	January 27	Jan 27 – Feb 10
Direct Sow	January 27	Jan 27 – Feb 17
Bloom	March 24	Mar 24 – Aug 11

▸ Zone 9b ~329 day growing season · Full guide →

Last frost: January 25 · First frost: December 20 · 329 day season

Activity	When	Date Range
Start Indoors	November 30	Nov 30 – Dec 14
Transplant Outdoors	January 11	Jan 11 – Jan 25
Direct Sow	January 4	Jan 4 – Jan 25
Bloom	March 8	Mar 8 – Jul 12

Growing Tips for California

Start seeds indoors 8–10 weeks before last frost; seeds need light for germination — press onto soil surface, do not cover. Direct sow after last frost or divide established clumps in spring or fall. Thrives in poor, well-drained soil — rich soil and high fertility cause floppy stems and reduce flower count. Avoid overwatering; excellent drought tolerance once established. Deadhead spent clusters to encourage rebloom. Divide every 2–3 years to prevent center die-out and control spread. Year 2+ plants bloom most heavily; first-year plants may produce limited flowers. Dried flowers retain color well for arrangements.

Yarrow in Other States

Frequently Asked Questions

When should I plant Yarrow in California?

Planting dates for Yarrow in California depend on your USDA zone. California spans zones 6b, 7a, 7b, 8a, 8b, 9a, 9b. Check the planting calendar above for your specific zone's frost dates and planting windows.

What zone is California for planting?

California contains USDA hardiness zones 6b, 7a, 7b, 8a, 8b, 9a, 9b. Your specific zone depends on your location within the state — northern and higher-elevation areas are in colder zones, while southern and coastal areas are warmer.

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