WhenToBird

Tyrannus vociferans · Tyrannidae

When Do Cassin's Kingbirds Arrive in California?

Adult Cassin's Kingbird
Photo: Irina Mitine, CC BY 4.0 via iNaturalist

The Cassin's Kingbird is in California all year. It turns up on about 10% of checklists at its peak (the second week of December) and on 6.0% in its quietest week (mid August).

When to look

PresentAll year
Peak weekDec 8-14the second week of December
Quietest weekAug 15-21mid August

Best: the second week of December. Here all year. Peak: on about 10% of California checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maycommon
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%Jan 1-7: 9.4% of 112336 checklistsJan 8-14: 8.9% of 85518 checklistsJan 15-21: 8.7% of 86488 checklistsJan 22-31: 8.2% of 116174 checklistsFeb 1-7: 8.6% of 75171 checklistsFeb 8-14: 7.7% of 84467 checklistsFeb 15-21: 7.5% of 105683 checklistsFeb 22-28: 8.5% of 83396 checklistsMar 1-7: 8.2% of 77470 checklistsMar 8-14: 8.1% of 75180 checklistsMar 15-21: 8.7% of 80770 checklistsMar 22-31: 8.7% of 114116 checklistsApr 1-7: 8.9% of 84057 checklistsApr 8-14: 8.3% of 83692 checklistsApr 15-21: 8.1% of 89242 checklistsApr 22-30: 7.8% of 114289 checklistsMay 1-7: 7.4% of 85728 checklistsMay 8-14: 7.0% of 91984 checklistsMay 15-21: 7.2% of 75478 checklistsMay 22-31: 7.1% of 106250 checklistsJun 1-7: 6.9% of 70051 checklistsJun 8-14: 7.1% of 67485 checklistsJun 15-21: 7.0% of 66269 checklistsJun 22-30: 7.0% of 79172 checklistsJul 1-7: 7.2% of 62877 checklistsJul 8-14: 7.3% of 60328 checklistsJul 15-21: 7.1% of 59705 checklistsJul 22-31: 6.5% of 83796 checklistsAug 1-7: 6.8% of 60215 checklistsAug 8-14: 6.1% of 60172 checklistsAug 15-21: 6.0% of 59877 checklistsAug 22-31: 6.0% of 89107 checklistsSep 1-7: 6.3% of 72000 checklistsSep 8-14: 6.5% of 71228 checklistsSep 15-21: 6.9% of 76808 checklistsSep 22-30: 7.7% of 100204 checklistsOct 1-7: 8.5% of 76571 checklistsOct 8-14: 8.5% of 80874 checklistsOct 15-21: 8.6% of 74581 checklistsOct 22-31: 9.1% of 97498 checklistsNov 1-7: 9.2% of 70851 checklistsNov 8-14: 9.2% of 72431 checklistsNov 15-21: 9.4% of 66767 checklistsNov 22-30: 9.7% of 94737 checklistsDec 1-7: 10% of 65393 checklistsDec 8-14: 10% of 67449 checklistsDec 15-21: 9.9% of 83421 checklistsDec 22-31: 9.8% 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. Orange CountyBest the second week of December · 4149 checklists that week, 244,559 in all33%
  2. San Diego CountyBest the second week of December · 7659 checklists that week, 405,465 in all30%
  3. Ventura CountyBest early April · 1999 checklists that week, 94,391 in all27%
  4. Santa Barbara CountyBest mid June · 1888 checklists that week, 120,616 in all23%
  5. Los Angeles CountyBest the second week of December · 7541 checklists that week, 410,235 in all21%
  6. San Bernardino CountyBest late January · 2068 checklists that week, 84,093 in all17%

Best spots

Share of checklists at the peak
  1. Arbor ParkOrange County, best late April · 23 checklists that week, 1,045 in all98%
  2. Harry Griffen ParkSan Diego County, best mid June · 21 checklists that week, 1,959 in all97%
  3. San Luis Rey River TrailSan Diego County, best early November · 39 checklists that week, 983 in all96%
  4. The Nature TrailLos Angeles County, best the second week of June · 25 checklists that week, 2,309 in all95%
  5. Stagecoach Community ParkSan Diego County, best mid February · 31 checklists that week, 193 in all93%

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

Best time of day

In California, the Cassin's Kingbird is most often listed on checklists started between 6 and 8 am (12% of those checklists).

0%5%10%15%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: 12% of 186053 checklists7 am: 12% of 444086 checklists8 am: 11% of 535846 checklists9 am: 9.1% of 486061 checklists10 am: 7.6% of 411130 checklists11 am: 6.6% of 325798 checklists12 pm: 6.0% of 269132 checklists1 pm: 5.3% of 244762 checklists2 pm: 5.3% of 235420 checklists3 pm: 5.7% of 232365 checklists4 pm: 5.7% of 208688 checklists5 pm: 6.2% of 146104 checklists6 pm: 5.4% 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
January9.4%8.9%8.7%8.2%
February8.6%7.7%7.5%8.5%
March8.2%8.1%8.7%8.7%
April8.9%8.3%8.1%7.8%
May7.4%7.0%7.2%7.1%
June6.9%7.1%7.0%7.0%
July7.2%7.3%7.1%6.5%
August6.8%6.1%6.0%6.0%
September6.3%6.5%6.9%7.7%
October8.5%8.5%8.6%9.1%
November9.2%9.2%9.4%9.7%
December10%10%9.9%9.8%

Neighboring states

  • Arizona: summer visitor, peaks late July
  • New Mexico: summer visitor, peaks late May
  • Colorado: summer visitor, peaks mid May
  • Oklahoma: summer visitor, peaks the second week of September

Common questions

When do Cassin's Kingbirds arrive in California?
The Cassin's Kingbird is in California all year. It turns up on about 10% of checklists at its peak (the second week of December) and on 6.0% in its quietest week (mid August).
When do Cassin's Kingbirds leave California?
The Cassin's Kingbird does not leave California: it is reported all year, from 6.0% of checklists in mid August to 10% in the second week of December.
When is the best time to see a Cassin's Kingbird in California?
The Cassin's Kingbird is reported most often in the second week of December, on about 10% of California checklists.
Where in California are Cassin's Kingbirds seen most often?
By county, Orange County, San Diego County, and Ventura County have the highest peak reporting rates for the Cassin's Kingbird (counties with at least 200 checklists).