WhenToBird

Vireo philadelphicus · Vireonidae

When Do Philadelphia Vireos Arrive in New York?

Adult Philadelphia Vireo
Photo: Sue Carnahan, CC BY 4.0 via iNaturalist

Philadelphia Vireos mostly pass through New York: they arrive in early September, peak in mid September (2.4% of checklists), and most are gone by late September.

When to look

First arrivalsSep 1-7early September
Common bySep 1-7early September
PeakSep 15-21mid September
Most gone bySep 22-30late September

Best: mid September. First arrivals early September; most are gone by late September. Peak: on about 2.4% of New York checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Mayuncommon
  6. Junrare
  7. Julnot usually seen
  8. Auguncommon
  9. Seppeak season
  10. Octuncommon
  11. Novnot usually seen
  12. Decnot usually seen

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

0%1%2%3%4%Jan 1-7: 0% of 66410 checklistsJan 8-14: 0% of 49310 checklistsJan 15-21: 0% of 49919 checklistsJan 22-31: 0% of 62513 checklistsFeb 1-7: 0% of 43526 checklistsFeb 8-14: 0% of 49753 checklistsFeb 15-21: 0% of 65147 checklistsFeb 22-28: 0% of 50173 checklistsMar 1-7: 0% of 50325 checklistsMar 8-14: 0% of 55371 checklistsMar 15-21: 0% of 56293 checklistsMar 22-31: 0% of 82677 checklistsApr 1-7: 0% of 65295 checklistsApr 8-14: 0% of 73080 checklistsApr 15-21: 0% of 73857 checklistsApr 22-30: 0.1% of 106093 checklistsMay 1-7: 0.1% of 102772 checklistsMay 8-14: 0.2% of 110051 checklistsMay 15-21: 0.9% of 94797 checklistsMay 22-31: 0.7% of 101272 checklistsJun 1-7: 0.1% of 59471 checklistsJun 8-14: 0.1% of 55497 checklistsJun 15-21: 0.1% of 51761 checklistsJun 22-30: 0.1% of 59219 checklistsJul 1-7: 0.1% of 48226 checklistsJul 8-14: 0.1% of 42315 checklistsJul 15-21: 0.1% of 40637 checklistsJul 22-31: 0.1% of 57183 checklistsAug 1-7: 0.1% of 40461 checklistsAug 8-14: 0.1% of 39880 checklistsAug 15-21: 0.1% of 41146 checklistsAug 22-31: 0.3% of 63381 checklistsSep 1-7: 1.2% of 48640 checklistsSep 8-14: 2.6% of 47882 checklistsSep 15-21: 3.1% of 49063 checklistsSep 22-30: 1.7% of 57906 checklistsOct 1-7: 0.5% of 48447 checklistsOct 8-14: 0.1% of 51901 checklistsOct 15-21: 0.1% of 46717 checklistsOct 22-31: 0.1% of 61992 checklistsNov 1-7: 0.1% of 44593 checklistsNov 8-14: 0.1% of 42566 checklistsNov 15-21: 0.1% of 39675 checklistsNov 22-30: 0% of 51197 checklistsDec 1-7: 0% of 36567 checklistsDec 8-14: 0% of 37254 checklistsDec 15-21: 0% of 43754 checklistsDec 22-31: 0% of 62470 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 New York 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 New York

Best counties

Share of checklists at the peak
  1. Washington CountyBest the second week of September · 133 checklists that week, 15,060 in all6.9%
  2. Schuyler CountyBest mid September · 234 checklists that week, 12,381 in all6.5%
  3. Allegany CountyBest the second week of September · 203 checklists that week, 11,955 in all5.6%
  4. Putnam CountyBest mid September · 233 checklists that week, 13,177 in all5.5%
  5. Cayuga CountyBest the second week of September · 376 checklists that week, 20,184 in all5.5%
  6. Tompkins CountyBest mid September · 4651 checklists that week, 219,250 in all5.3%

Best spots

Share of checklists at the peak
  1. Onondaga County Div of LandOnondaga County, best mid September · 38 checklists that week, 657 in all24%
  2. Lindsay-Parsons Biodiversity PreserveTompkins County, best late September · 26 checklists that week, 1,145 in all23%
  3. Amherst State ParkErie County, best mid September · 126 checklists that week, 3,404 in all22%
  4. Beebe Lake (north)Tompkins County, best mid September · 70 checklists that week, 1,607 in all21%

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

Best time of day

In New York, the Philadelphia Vireo is most often listed on checklists started between 6 and 8 am (0.5% of those checklists).

0%0.5%1%12 am: too few checklists (1146) to judge1 am: too few checklists (1055) to judge2 am: too few checklists (1121) to judge3 am: too few checklists (1353) to judge4 am: too few checklists (4785) to judge5 am: too few checklists (32052) to judge6 am: 0.5% of 124869 checklists7 am: 0.5% of 298506 checklists8 am: 0.4% of 337334 checklists9 am: 0.3% of 307787 checklists10 am: 0.2% of 270801 checklists11 am: 0.2% of 233238 checklists12 pm: 0.1% of 213830 checklists1 pm: 0.1% of 193321 checklists2 pm: 0.1% of 180741 checklists3 pm: 0.1% of 170348 checklists4 pm: 0.1% of 147224 checklists5 pm: 0.1% of 111962 checklists6 pm: 0.1% of 78261 checklists7 pm: too few checklists (44425) to judge8 pm: too few checklists (15648) to judge9 pm: too few checklists (4795) to judge10 pm: too few checklists (2454) to judge11 pm: too few checklists (1378) 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
January0%0%0%0%
February0%0%0%0%
March0%0%0%0%
April0%0%0%0.1%
May0.1%0.2%0.9%0.7%
June0.1%0.1%0.1%0.1%
July0.1%0.1%0.1%0.1%
August0.1%0.1%0.1%0.3%
September1.2%2.6%3.1%1.7%
October0.5%0.1%0.1%0.1%
November0.1%0.1%0.1%0%
December0%0%0%0%

Neighboring states

  • Connecticut: arrives early September, in the same week than New York
  • New Jersey: arrives early September, in the same week than New York
  • Pennsylvania: arrives early September, in the same week than New York
  • Vermont: arrives late August, 1 week earlier than New York

Common questions

When do Philadelphia Vireos arrive in New York?
Philadelphia Vireos mostly pass through New York: they arrive in early September, peak in mid September (2.4% of checklists), and most are gone by late September.
When do Philadelphia Vireos leave New York?
Most Philadelphia Vireos have left New York by late September, when reports fall below half their usual rate.
When is the best time to see a Philadelphia Vireo in New York?
The Philadelphia Vireo is reported most often in mid September, on about 2.4% of New York checklists.
Where in New York are Philadelphia Vireos seen most often?
By county, Washington County, Schuyler County, and Allegany County have the highest peak reporting rates for the Philadelphia Vireo (counties with at least 200 checklists).