WhenToBird

Vireo philadelphicus · Vireonidae

Philadelphia Vireo: When and Where to See It

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

The Philadelphia Vireo reaches Maine first, around mid August, and North Carolina last, around mid September.

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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0%0.5%1%1.5%2%Jan 1-7: 0.1% of 1114036 checklistsJan 8-14: 0.1% of 824708 checklistsJan 15-21: 0.1% of 825978 checklistsJan 22-31: 0.1% of 1105853 checklistsFeb 1-7: 0.1% of 779772 checklistsFeb 8-14: 0.1% of 864504 checklistsFeb 15-21: 0.1% of 1127933 checklistsFeb 22-28: 0.1% of 840124 checklistsMar 1-7: 0.1% of 839610 checklistsMar 8-14: 0.1% of 870138 checklistsMar 15-21: 0.1% of 898456 checklistsMar 22-31: 0.1% of 1335637 checklistsApr 1-7: 0.1% of 1030617 checklistsApr 8-14: 0.1% of 1124024 checklistsApr 15-21: 0.1% of 1194575 checklistsApr 22-30: 0.3% of 1675723 checklistsMay 1-7: 0.4% of 1449080 checklistsMay 8-14: 0.8% of 1538353 checklistsMay 15-21: 1.2% of 1219898 checklistsMay 22-31: 0.5% of 1452282 checklistsJun 1-7: 0.1% of 900636 checklistsJun 8-14: 0.1% of 829907 checklistsJun 15-21: 0.1% of 773255 checklistsJun 22-30: 0.1% of 916255 checklistsJul 1-7: 0.1% of 717733 checklistsJul 8-14: 0.1% of 658223 checklistsJul 15-21: 0.1% of 638752 checklistsJul 22-31: 0.1% of 895727 checklistsAug 1-7: 0.1% of 655651 checklistsAug 8-14: 0.1% of 650038 checklistsAug 15-21: 0.1% of 654639 checklistsAug 22-31: 0.3% of 974928 checklistsSep 1-7: 0.9% of 765914 checklistsSep 8-14: 1.5% of 738674 checklistsSep 15-21: 1.6% of 750433 checklistsSep 22-30: 1.3% of 944196 checklistsOct 1-7: 0.7% of 760106 checklistsOct 8-14: 0.3% of 793131 checklistsOct 15-21: 0.1% of 728727 checklistsOct 22-31: 0.1% of 959954 checklistsNov 1-7: 0.1% of 709464 checklistsNov 8-14: 0.1% of 693424 checklistsNov 15-21: 0.1% of 653952 checklistsNov 22-30: 0.1% of 871137 checklistsDec 1-7: 0.1% of 627591 checklistsDec 8-14: 0.1% of 642427 checklistsDec 15-21: 0.1% of 775638 checklistsDec 22-31: 0.1% of 1132751 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Pooled across every state in the data, so it leans toward states with the most birders.

States, in order of first arrivals

StatePatternFirst arrivalsPeakMost gone byPeak %
TexasPasses throughApr 15-21May 1-7May 15-212.9%
ArkansasPasses throughApr 15-21May 8-14May 22-312.4%
KansasPasses throughApr 22-30May 8-14May 22-312.6%
MissouriSummer visitorApr 22-30May 8-14May 22-312.7%
South DakotaPasses throughMay 8-14May 22-31Jun 1-71.6%
MainePasses throughAug 15-21Sep 8-14Oct 1-73.0%
MichiganPasses throughAug 15-21Sep 8-14Oct 1-73.3%
MinnesotaPasses throughAug 15-21Sep 8-14Oct 1-73.9%
North DakotaPasses throughAug 15-21Sep 8-14Sep 15-213.8%
WisconsinPasses throughAug 15-21Sep 8-14Oct 1-72.7%
IowaPasses throughAug 22-31Sep 8-14Oct 1-75.3%
IllinoisPasses throughAug 22-31Sep 15-21Oct 1-74.4%
IndianaPasses throughAug 22-31Sep 15-21Oct 1-74.2%
OhioPasses throughAug 22-31Sep 15-21Oct 1-74.4%
New HampshirePasses throughAug 22-31Sep 8-14Sep 22-302.2%
VermontPasses throughAug 22-31Sep 8-14Sep 22-302.4%
KentuckyPasses throughSep 1-7Sep 22-30Oct 8-144.8%
ConnecticutPasses throughSep 1-7Sep 15-21Oct 1-71.4%
MassachusettsPasses throughSep 1-7Sep 15-21Oct 1-71.5%
New JerseyPasses throughSep 1-7Sep 15-21Oct 1-71.7%
New YorkPasses throughSep 1-7Sep 15-21Sep 22-302.4%
PennsylvaniaPasses throughSep 1-7Sep 15-21Oct 1-72.1%
AlabamaPasses throughSep 8-14Oct 1-7Oct 22-313.2%
District of ColumbiaPasses throughSep 8-14Sep 22-30Oct 1-73.1%
TennesseePasses throughSep 8-14Sep 22-30Oct 8-144.0%
DelawarePasses throughSep 8-14Sep 15-21Oct 1-71.9%
MarylandPasses throughSep 8-14Sep 15-21Oct 1-71.7%
MississippiPasses throughSep 8-14Oct 1-7Oct 15-212.4%
Rhode IslandPasses throughSep 8-14Sep 15-21Oct 1-71.4%
VirginiaPasses throughSep 8-14Sep 15-21Oct 1-71.1%
West VirginiaPasses throughSep 8-14Sep 15-21Oct 1-72.5%
LouisianaPasses throughSep 15-21Oct 1-7Oct 22-312.5%
GeorgiaPasses throughSep 15-21Sep 22-30Oct 8-141.5%
North CarolinaPasses throughSep 15-21Sep 22-30Oct 8-141.7%

Passes through: Texas, Arkansas, Kansas, South Dakota

Summer visitor in: Missouri