WhenToBird

Troglodytes pacificus · Troglodytidae

When Do Pacific Wrens Arrive in California?

Adult Pacific Wren
Photo: louisiv826, CC BY 4.0 via iNaturalist

The Pacific Wren is in California all year. It turns up on about 2.4% of checklists at its peak (the second week of June) and on 1.0% in its quietest week (the second week of January).

When to look

PresentAll year
Peak weekJun 8-14the second week of June
Quietest weekJan 8-14the second week of January

Best: the second week of June. Here all year. Peak: on about 2.4% of California checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novcommon
  12. Deccommon

Darker months: more checklists report it. Outlined: peak month.

0%1%2%3%Jan 1-7: 1.0% of 112336 checklistsJan 8-14: 1.0% of 85518 checklistsJan 15-21: 1.1% of 86488 checklistsJan 22-31: 1.2% of 116174 checklistsFeb 1-7: 1.1% of 75171 checklistsFeb 8-14: 1.2% of 84467 checklistsFeb 15-21: 1.1% of 105683 checklistsFeb 22-28: 1.3% of 83396 checklistsMar 1-7: 1.3% of 77470 checklistsMar 8-14: 1.4% of 75180 checklistsMar 15-21: 1.6% of 80770 checklistsMar 22-31: 1.8% of 114116 checklistsApr 1-7: 1.7% of 84057 checklistsApr 8-14: 1.6% of 83692 checklistsApr 15-21: 1.9% of 89242 checklistsApr 22-30: 1.8% of 114289 checklistsMay 1-7: 1.7% of 85728 checklistsMay 8-14: 1.8% of 91984 checklistsMay 15-21: 2.0% of 75478 checklistsMay 22-31: 2.2% of 106250 checklistsJun 1-7: 2.4% of 70051 checklistsJun 8-14: 2.3% of 67485 checklistsJun 15-21: 2.4% of 66269 checklistsJun 22-30: 2.2% of 79172 checklistsJul 1-7: 2.3% of 62877 checklistsJul 8-14: 1.9% of 60328 checklistsJul 15-21: 1.6% of 59705 checklistsJul 22-31: 1.3% of 83796 checklistsAug 1-7: 1.0% of 60215 checklistsAug 8-14: 1.0% of 60172 checklistsAug 15-21: 1.1% of 59877 checklistsAug 22-31: 1.3% of 89107 checklistsSep 1-7: 1.5% of 72000 checklistsSep 8-14: 1.6% of 71228 checklistsSep 15-21: 1.7% of 76808 checklistsSep 22-30: 1.8% of 100204 checklistsOct 1-7: 1.8% of 76571 checklistsOct 8-14: 1.6% of 80874 checklistsOct 15-21: 1.6% of 74581 checklistsOct 22-31: 1.5% of 97498 checklistsNov 1-7: 1.3% of 70851 checklistsNov 8-14: 1.2% of 72431 checklistsNov 15-21: 1.1% of 66767 checklistsNov 22-30: 1.2% of 94737 checklistsDec 1-7: 1.0% of 65393 checklistsDec 8-14: 1.0% of 67449 checklistsDec 15-21: 1.2% of 83421 checklistsDec 22-31: 1.1% of 124993 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in California that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in California

Best counties

Share of checklists at the peak
  1. Del Norte CountyBest the second week of June · 370 checklists that week, 16,363 in all26%
  2. Calaveras CountyBest late May · 268 checklists that week, 6,843 in all21%
  3. San Francisco CountyBest the second week of June · 1901 checklists that week, 130,018 in all15%
  4. Humboldt CountyBest late June · 2116 checklists that week, 95,963 in all15%
  5. Mendocino CountyBest early September · 1009 checklists that week, 47,934 in all11%
  6. San Mateo CountyBest early June · 2586 checklists that week, 148,781 in all8.6%

Best spots

Share of checklists at the peak
  1. Trinidad State BeachHumboldt County, best mid April · 22 checklists that week, 294 in all91%
  2. Twin Peaks ReservoirSan Francisco County, best mid April · 82 checklists that week, 2,067 in all91%
  3. Mount Sutro Open Space ReserveSan Francisco County, best late April · 29 checklists that week, 682 in all89%
  4. Muir Woods National MonumentMarin County, best late June · 20 checklists that week, 485 in all86%
  5. Burleigh H. Murray RanchSan Mateo County, best mid March · 49 checklists that week, 1,656 in all82%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In California, the Pacific Wren is most often listed on checklists started between 8 and 10 am (1.8% of those checklists).

0%0.5%1%1.5%2%12 am: too few checklists (1688) to judge1 am: too few checklists (1451) to judge2 am: too few checklists (1402) to judge3 am: too few checklists (1743) to judge4 am: too few checklists (4647) to judge5 am: too few checklists (32158) to judge6 am: 1.4% of 186053 checklists7 am: 1.6% of 444086 checklists8 am: 1.8% of 535846 checklists9 am: 1.8% of 486061 checklists10 am: 1.8% of 411130 checklists11 am: 1.6% of 325798 checklists12 pm: 1.4% of 269132 checklists1 pm: 1.3% of 244762 checklists2 pm: 1.3% of 235420 checklists3 pm: 1.1% of 232365 checklists4 pm: 1.1% of 208688 checklists5 pm: 1.1% of 146104 checklists6 pm: 0.8% of 96867 checklists7 pm: too few checklists (50942) to judge8 pm: too few checklists (14803) to judge9 pm: too few checklists (5561) to judge10 pm: too few checklists (3546) to judge11 pm: too few checklists (2092) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January1.0%1.0%1.1%1.2%
February1.1%1.2%1.1%1.3%
March1.3%1.4%1.6%1.8%
April1.7%1.6%1.9%1.8%
May1.7%1.8%2.0%2.2%
June2.4%2.3%2.4%2.2%
July2.3%1.9%1.6%1.3%
August1.0%1.0%1.1%1.3%
September1.5%1.6%1.7%1.8%
October1.8%1.6%1.6%1.5%
November1.3%1.2%1.1%1.2%
December1.0%1.0%1.2%1.1%

Neighboring states

  • Oregon: all year, most in fall, peaks mid October
  • Idaho: winter visitor, peaks early November
  • Washington: all year, most in winter, peaks mid November
  • Montana: summer visitor, peaks the second week of July

Common questions

When do Pacific Wrens arrive in California?
The Pacific Wren is in California all year. It turns up on about 2.4% of checklists at its peak (the second week of June) and on 1.0% in its quietest week (the second week of January).
When do Pacific Wrens leave California?
The Pacific Wren does not leave California: it is reported all year, from 1.0% of checklists in the second week of January to 2.4% in the second week of June.
When is the best time to see a Pacific Wren in California?
The Pacific Wren is reported most often in the second week of June, on about 2.4% of California checklists.
Where in California are Pacific Wrens seen most often?
By county, Del Norte County, Calaveras County, and San Francisco County have the highest peak reporting rates for the Pacific Wren (counties with at least 200 checklists).