WhenToBird

Vireo huttoni · Vireonidae

When Do Hutton's Vireos Arrive in California?

Adult Hutton's Vireo
Photo: Garth Harwood, CC BY 4.0 via iNaturalist

The Hutton's Vireo is in California all year. It turns up on about 6.8% of checklists at its peak (late September) and on 3.3% in its quietest week (early January).

When to look

PresentAll year
Peak weekSep 22-30late September
Quietest weekJan 1-7early January

Best: late September. Here all year. Peak: on about 6.8% of California checklists.

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

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

0%2%4%6%8%Jan 1-7: 3.2% of 112336 checklistsJan 8-14: 3.3% of 85518 checklistsJan 15-21: 3.7% of 86488 checklistsJan 22-31: 4.4% of 116174 checklistsFeb 1-7: 4.5% of 75171 checklistsFeb 8-14: 4.8% of 84467 checklistsFeb 15-21: 4.3% of 105683 checklistsFeb 22-28: 5.2% of 83396 checklistsMar 1-7: 5.0% of 77470 checklistsMar 8-14: 5.4% of 75180 checklistsMar 15-21: 5.6% of 80770 checklistsMar 22-31: 5.9% of 114116 checklistsApr 1-7: 5.9% of 84057 checklistsApr 8-14: 6.3% of 83692 checklistsApr 15-21: 6.4% of 89242 checklistsApr 22-30: 6.3% of 114289 checklistsMay 1-7: 6.4% of 85728 checklistsMay 8-14: 6.2% of 91984 checklistsMay 15-21: 6.2% of 75478 checklistsMay 22-31: 6.3% of 106250 checklistsJun 1-7: 6.3% of 70051 checklistsJun 8-14: 5.6% of 67485 checklistsJun 15-21: 5.2% of 66269 checklistsJun 22-30: 5.0% of 79172 checklistsJul 1-7: 4.7% of 62877 checklistsJul 8-14: 4.3% of 60328 checklistsJul 15-21: 3.8% of 59705 checklistsJul 22-31: 3.7% of 83796 checklistsAug 1-7: 3.7% of 60215 checklistsAug 8-14: 3.9% of 60172 checklistsAug 15-21: 4.1% of 59877 checklistsAug 22-31: 4.7% of 89107 checklistsSep 1-7: 5.8% of 72000 checklistsSep 8-14: 6.3% of 71228 checklistsSep 15-21: 6.8% of 76808 checklistsSep 22-30: 7.0% of 100204 checklistsOct 1-7: 6.6% of 76571 checklistsOct 8-14: 5.4% of 80874 checklistsOct 15-21: 5.2% of 74581 checklistsOct 22-31: 4.6% of 97498 checklistsNov 1-7: 3.9% of 70851 checklistsNov 8-14: 3.8% of 72431 checklistsNov 15-21: 3.5% of 66767 checklistsNov 22-30: 3.4% of 94737 checklistsDec 1-7: 3.3% of 65393 checklistsDec 8-14: 3.5% of 67449 checklistsDec 15-21: 3.8% of 83421 checklistsDec 22-31: 3.5% 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. Monterey CountyBest late September · 4332 checklists that week, 132,505 in all22%
  2. Contra Costa CountyBest early May · 2516 checklists that week, 115,071 in all18%
  3. Nevada CountyBest early April · 512 checklists that week, 25,896 in all18%
  4. San Luis Obispo CountyBest late September · 3098 checklists that week, 124,667 in all16%
  5. San Mateo CountyBest late May · 3863 checklists that week, 148,781 in all15%
  6. Napa CountyBest early June · 506 checklists that week, 18,976 in all14%

Best spots

Share of checklists at the peak
  1. Tunitas Creek Open Space PreserveSan Mateo County, best early September · 24 checklists that week, 312 in all77%
  2. Folsom Lake State Recreation Area (Sweetwater Creek)El Dorado County, best late April · 25 checklists that week, 201 in all74%
  3. Carmel River State Beach (Hatton Canyon)Monterey County, best mid October · 85 checklists that week, 1,994 in all73%
  4. Uncle Sam CanyonContra Costa County, best the second week of May · 127 checklists that week, 1,204 in all73%
  5. Hatton CanyonMonterey County, best late October · 24 checklists that week, 531 in all72%

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

Best time of day

In California, the Hutton's Vireo is most often listed on checklists started between 7 and 9 am (6.8% of those checklists).

0%2%4%6%8%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: 6.3% of 186053 checklists7 am: 6.8% of 444086 checklists8 am: 6.8% of 535846 checklists9 am: 6.2% of 486061 checklists10 am: 5.4% of 411130 checklists11 am: 4.9% of 325798 checklists12 pm: 4.2% of 269132 checklists1 pm: 3.8% of 244762 checklists2 pm: 3.6% of 235420 checklists3 pm: 3.0% of 232365 checklists4 pm: 2.6% of 208688 checklists5 pm: 2.5% of 146104 checklists6 pm: 1.6% 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
January3.2%3.3%3.7%4.4%
February4.5%4.8%4.3%5.2%
March5.0%5.4%5.6%5.9%
April5.9%6.3%6.4%6.3%
May6.4%6.2%6.2%6.3%
June6.3%5.6%5.2%5.0%
July4.7%4.3%3.8%3.7%
August3.7%3.9%4.1%4.7%
September5.8%6.3%6.8%7.0%
October6.6%5.4%5.2%4.6%
November3.9%3.8%3.5%3.4%
December3.3%3.5%3.8%3.5%

Neighboring states

  • Arizona: all year, most in summer, peaks the second week of August
  • Oregon: winter visitor, peaks late March
  • Washington: winter visitor, peaks late March

Common questions

When do Hutton's Vireos arrive in California?
The Hutton's Vireo is in California all year. It turns up on about 6.8% of checklists at its peak (late September) and on 3.3% in its quietest week (early January).
When do Hutton's Vireos leave California?
The Hutton's Vireo does not leave California: it is reported all year, from 3.3% of checklists in early January to 6.8% in late September.
When is the best time to see a Hutton's Vireo in California?
The Hutton's Vireo is reported most often in late September, on about 6.8% of California checklists.
Where in California are Hutton's Vireos seen most often?
By county, Monterey County, Contra Costa County, and Nevada County have the highest peak reporting rates for the Hutton's Vireo (counties with at least 200 checklists).