WhenToBird

Geothlypis trichas · Parulidae

When Do Common Yellowthroats Arrive in California?

Adult male Common Yellowthroat
Photo: cbugni, CC BY 4.0 via iNaturalist

The Common Yellowthroat is in California all year. It turns up on about 17% of checklists at its peak (mid September) and on 7.5% in its quietest week (the second week of February).

When to look

PresentAll year
Peak weekSep 15-21mid September
Quietest weekFeb 8-14the second week of February

Best: mid September. Here all year. Peak: on about 17% of California checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novcommon
  12. Deccommon

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

0%5%10%15%20%Jan 1-7: 10% of 112336 checklistsJan 8-14: 9.7% of 85518 checklistsJan 15-21: 9.5% of 86488 checklistsJan 22-31: 8.6% of 116174 checklistsFeb 1-7: 8.1% of 75171 checklistsFeb 8-14: 7.5% of 84467 checklistsFeb 15-21: 7.2% of 105683 checklistsFeb 22-28: 8.5% of 83396 checklistsMar 1-7: 8.9% of 77470 checklistsMar 8-14: 9.3% of 75180 checklistsMar 15-21: 10% of 80770 checklistsMar 22-31: 11% of 114116 checklistsApr 1-7: 13% of 84057 checklistsApr 8-14: 13% of 83692 checklistsApr 15-21: 14% of 89242 checklistsApr 22-30: 13% of 114289 checklistsMay 1-7: 14% of 85728 checklistsMay 8-14: 13% of 91984 checklistsMay 15-21: 13% of 75478 checklistsMay 22-31: 13% of 106250 checklistsJun 1-7: 13% of 70051 checklistsJun 8-14: 13% of 67485 checklistsJun 15-21: 13% of 66269 checklistsJun 22-30: 13% of 79172 checklistsJul 1-7: 12% of 62877 checklistsJul 8-14: 10% of 60328 checklistsJul 15-21: 8.7% of 59705 checklistsJul 22-31: 8.1% of 83796 checklistsAug 1-7: 8.5% of 60215 checklistsAug 8-14: 9.0% of 60172 checklistsAug 15-21: 10% of 59877 checklistsAug 22-31: 13% of 89107 checklistsSep 1-7: 15% of 72000 checklistsSep 8-14: 16% of 71228 checklistsSep 15-21: 17% of 76808 checklistsSep 22-30: 17% of 100204 checklistsOct 1-7: 16% of 76571 checklistsOct 8-14: 14% of 80874 checklistsOct 15-21: 12% of 74581 checklistsOct 22-31: 12% of 97498 checklistsNov 1-7: 11% of 70851 checklistsNov 8-14: 11% of 72431 checklistsNov 15-21: 11% of 66767 checklistsNov 22-30: 11% of 94737 checklistsDec 1-7: 12% of 65393 checklistsDec 8-14: 11% of 67449 checklistsDec 15-21: 10% of 83421 checklistsDec 22-31: 10% 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 June · 3729 checklists that week, 244,559 in all39%
  2. Imperial CountyBest the second week of June · 183 checklists that week, 24,551 in all34%
  3. Santa Barbara CountyBest mid September · 2632 checklists that week, 120,616 in all33%
  4. San Luis Obispo CountyBest mid September · 2138 checklists that week, 124,667 in all31%
  5. Ventura CountyBest the second week of September · 1945 checklists that week, 94,391 in all29%
  6. Humboldt CountyBest the second week of September · 1938 checklists that week, 95,963 in all26%

Best spots

Share of checklists at the peak
  1. Salt Pond (historical)Los Angeles County, best early December · 21 checklists that week, 776 in all98%
  2. Sacramento Regional County Sanitation DistrictSacramento County, best late June · 62 checklists that week, 2,065 in all98%
  3. Fairview Park (north)Orange County, best the second week of May · 20 checklists that week, 362 in all97%
  4. Batiquitos Lagoon Ecological Reserve (San Marcos Creek)San Diego County, best early June · 22 checklists that week, 910 in all97%
  5. Poway Community ParkSan Diego County, best early September · 21 checklists that week, 621 in all96%

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

Best time of day

In California, the Common Yellowthroat is most often listed on checklists started between 6 and 8 am (17% of those checklists).

0%5%10%15%20%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: 16% of 186053 checklists7 am: 17% of 444086 checklists8 am: 16% of 535846 checklists9 am: 13% of 486061 checklists10 am: 11% of 411130 checklists11 am: 9.7% of 325798 checklists12 pm: 8.8% of 269132 checklists1 pm: 8.1% of 244762 checklists2 pm: 8.0% of 235420 checklists3 pm: 7.8% of 232365 checklists4 pm: 7.7% of 208688 checklists5 pm: 8.3% of 146104 checklists6 pm: 7.4% 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
January10%9.7%9.5%8.6%
February8.1%7.5%7.2%8.5%
March8.9%9.3%10%11%
April13%13%14%13%
May14%13%13%13%
June13%13%13%13%
July12%10%8.7%8.1%
August8.5%9.0%10%13%
September15%16%17%17%
October16%14%12%12%
November11%11%11%11%
December12%11%10%10%

Neighboring states

  • Nevada: summer visitor, peaks mid September
  • Utah: summer visitor, peaks late May
  • Arizona: all year, most in summer, peaks early May
  • Oregon: summer visitor, peaks the second week of May

Common questions

When do Common Yellowthroats arrive in California?
The Common Yellowthroat is in California all year. It turns up on about 17% of checklists at its peak (mid September) and on 7.5% in its quietest week (the second week of February).
When do Common Yellowthroats leave California?
The Common Yellowthroat does not leave California: it is reported all year, from 7.5% of checklists in the second week of February to 17% in mid September.
When is the best time to see a Common Yellowthroat in California?
The Common Yellowthroat is reported most often in mid September, on about 17% of California checklists.
Where in California are Common Yellowthroats seen most often?
By county, Orange County, Imperial County, and Santa Barbara County have the highest peak reporting rates for the Common Yellowthroat (counties with at least 200 checklists).