WhenToBird

Empidonax traillii · Tyrannidae

Willow Flycatcher: When and Where to See It

Adult Willow Flycatcher
Photo: Steven Smethurst, CC0 1.0 via iNaturalist

The Willow Flycatcher reaches Ohio first, around early May, and North Dakota last, around late May.

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%2%4%6%8%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% of 898456 checklistsMar 22-31: 0% 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: 0.1% of 1675723 checklistsMay 1-7: 0.2% of 1449080 checklistsMay 8-14: 1.1% of 1538353 checklistsMay 15-21: 3.7% of 1219898 checklistsMay 22-31: 6.1% of 1452282 checklistsJun 1-7: 6.2% of 900636 checklistsJun 8-14: 5.3% of 829907 checklistsJun 15-21: 4.6% of 773255 checklistsJun 22-30: 3.5% of 916255 checklistsJul 1-7: 3.0% of 717733 checklistsJul 8-14: 3.0% of 658223 checklistsJul 15-21: 3.3% of 638752 checklistsJul 22-31: 3.2% of 895727 checklistsAug 1-7: 2.1% of 655651 checklistsAug 8-14: 1.6% of 650038 checklistsAug 15-21: 1.3% of 654639 checklistsAug 22-31: 1.3% of 974928 checklistsSep 1-7: 1.2% of 765914 checklistsSep 8-14: 0.9% of 738674 checklistsSep 15-21: 0.6% of 750433 checklistsSep 22-30: 0.3% of 944196 checklistsOct 1-7: 0.1% of 760106 checklistsOct 8-14: 0.1% 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 %
OhioSummer visitorMay 1-7Jun 1-7Aug 1-719%
IndianaSummer visitorMay 1-7Jun 1-7Aug 1-712%
KansasPasses throughMay 1-7May 22-31Jun 8-141.4%
North CarolinaSummer visitorMay 1-7May 15-21Aug 1-71.1%
OklahomaPasses throughMay 1-7May 15-21Jun 1-71.1%
TennesseePasses throughMay 1-7May 15-21Jul 22-311.3%
Rhode IslandSummer visitorMay 8-14Jun 1-7Aug 1-715%
ConnecticutSummer visitorMay 8-14Jun 1-7Aug 1-713%
New JerseySummer visitorMay 8-14Jun 1-7Aug 1-713%
IllinoisSummer visitorMay 8-14Jun 1-7Aug 1-711%
New YorkSummer visitorMay 8-14Jun 1-7Aug 1-712%
IowaSummer visitorMay 8-14Jun 1-7Aug 8-148.9%
MassachusettsSummer visitorMay 8-14Jun 1-7Aug 1-78.7%
MichiganSummer visitorMay 8-14Jun 1-7Aug 1-77.9%
PennsylvaniaSummer visitorMay 8-14Jun 1-7Aug 1-79.9%
VermontSummer visitorMay 8-14Jun 1-7Aug 1-78.4%
WisconsinSummer visitorMay 8-14Jun 1-7Aug 1-78.9%
District of ColumbiaPasses throughMay 8-14Jun 1-7Jul 8-146.0%
NebraskaSummer visitorMay 8-14Jun 1-7Sep 1-75.0%
DelawarePasses throughMay 8-14Jun 1-7Jul 15-214.7%
KentuckySummer visitorMay 8-14May 22-31Aug 1-73.0%
MarylandSummer visitorMay 8-14Jun 1-7Jul 22-313.4%
New MexicoSummer visitorMay 8-14May 22-31Jun 15-213.8%
South DakotaSummer visitorMay 8-14May 22-31Sep 1-73.2%
West VirginiaSummer visitorMay 8-14Jun 1-7Aug 8-144.9%
ColoradoSummer visitorMay 8-14May 22-31Sep 8-141.7%
MissouriSummer visitorMay 8-14May 22-31Aug 8-141.5%
VirginiaSummer visitorMay 8-14May 22-31Aug 1-71.7%
WashingtonSummer visitorMay 15-21Jun 15-21Aug 8-1417%
MontanaSummer visitorMay 15-21Jun 15-21Aug 15-2111%
IdahoSummer visitorMay 15-21Jun 8-14Aug 15-218.8%
New HampshireSummer visitorMay 15-21Jun 1-7Aug 1-75.3%
OregonSummer visitorMay 15-21Jun 8-14Sep 8-147.0%
MinnesotaSummer visitorMay 15-21Jun 8-14Aug 1-74.0%
UtahSummer visitorMay 15-21Jun 1-7Sep 8-143.4%
MaineSummer visitorMay 15-21Jun 1-7Aug 1-72.0%
WyomingSummer visitorMay 15-21Jun 8-14Sep 1-72.5%
North DakotaSummer visitorMay 22-31Jun 8-14Aug 8-146.6%
ArizonaPasses throughAug 1-7Sep 8-14Oct 1-73.7%
NevadaSummer visitorAug 1-7Sep 8-14Sep 22-303.8%
TexasSummer visitorAug 1-7Aug 22-31Sep 15-211.1%
CaliforniaPasses throughAug 8-14Sep 1-7Oct 1-74.4%

Passes through: Arizona, California

Summer visitor in: Nevada, Texas