WhenToBird

Petrochelidon pyrrhonota · Hirundinidae

Cliff Swallow: When and Where to See It

Adult Cliff Swallow
Photo: Dean Hester, CC BY 4.0 via iNaturalist

The Cliff Swallow reaches Arizona first, around mid February, and Alaska last, around the second week of 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: 0.2% of 840124 checklistsMar 1-7: 0.4% of 839610 checklistsMar 8-14: 0.6% of 870138 checklistsMar 15-21: 0.9% of 898456 checklistsMar 22-31: 1.3% of 1335637 checklistsApr 1-7: 1.9% of 1030617 checklistsApr 8-14: 2.4% of 1124024 checklistsApr 15-21: 3.2% of 1194575 checklistsApr 22-30: 4.1% of 1675723 checklistsMay 1-7: 4.9% of 1449080 checklistsMay 8-14: 5.4% of 1538353 checklistsMay 15-21: 6.1% of 1219898 checklistsMay 22-31: 6.7% of 1452282 checklistsJun 1-7: 6.4% of 900636 checklistsJun 8-14: 6.6% of 829907 checklistsJun 15-21: 6.8% of 773255 checklistsJun 22-30: 6.8% of 916255 checklistsJul 1-7: 6.8% of 717733 checklistsJul 8-14: 6.6% of 658223 checklistsJul 15-21: 6.2% of 638752 checklistsJul 22-31: 5.5% of 895727 checklistsAug 1-7: 4.9% of 655651 checklistsAug 8-14: 4.2% of 650038 checklistsAug 15-21: 3.3% of 654639 checklistsAug 22-31: 2.3% of 974928 checklistsSep 1-7: 1.5% of 765914 checklistsSep 8-14: 0.9% of 738674 checklistsSep 15-21: 0.5% of 750433 checklistsSep 22-30: 0.3% of 944196 checklistsOct 1-7: 0.2% 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 %
ArizonaSummer visitorFeb 15-21Jun 22-30Sep 1-77.9%
CaliforniaSummer visitorMar 1-7Jun 8-14Aug 8-1420%
NevadaSummer visitorMar 1-7May 1-7Aug 8-1415%
TexasSummer visitorMar 8-14May 15-21Aug 22-3111%
New MexicoSummer visitorMar 15-21Jun 15-21Aug 22-3113%
MississippiSummer visitorMar 15-21Jun 22-30Aug 8-1410%
LouisianaSummer visitorMar 15-21Jun 8-14Sep 8-147.6%
TennesseeSummer visitorMar 15-21Jun 1-7Aug 8-148.0%
AlabamaSummer visitorMar 15-21May 8-14Aug 15-216.4%
OklahomaSummer visitorMar 22-31May 15-21Aug 1-717%
OregonSummer visitorMar 22-31May 22-31Aug 8-1412%
ArkansasSummer visitorMar 22-31May 8-14Aug 15-217.0%
GeorgiaSummer visitorMar 22-31May 15-21Aug 8-143.9%
UtahSummer visitorApr 1-7Jun 22-30Aug 8-1416%
IdahoSummer visitorApr 1-7Jun 22-30Aug 8-1414%
WashingtonSummer visitorApr 1-7Jun 1-7Aug 1-710%
MissouriSummer visitorApr 1-7May 22-31Aug 22-317.4%
North CarolinaSummer visitorApr 1-7May 8-14Aug 1-72.8%
KansasSummer visitorApr 8-14Jul 1-7Aug 22-3114%
District of ColumbiaSummer visitorApr 8-14Jun 8-14Jul 22-318.1%
KentuckySummer visitorApr 8-14Jun 1-7Aug 15-214.3%
South CarolinaSummer visitorApr 8-14May 15-21Aug 1-72.1%
VirginiaSummer visitorApr 8-14Jun 1-7Aug 8-141.4%
NebraskaSummer visitorApr 15-21Jul 1-7Aug 22-3121%
ColoradoSummer visitorApr 15-21May 22-31Aug 1-718%
IowaSummer visitorApr 15-21Jul 1-7Sep 1-718%
IllinoisSummer visitorApr 15-21Jul 22-31Sep 1-77.1%
OhioSummer visitorApr 15-21Jul 8-14Aug 15-215.2%
WisconsinSummer visitorApr 15-21Jul 8-14Aug 15-217.0%
IndianaSummer visitorApr 15-21Jul 1-7Aug 22-314.2%
West VirginiaSummer visitorApr 15-21Jul 1-7Aug 8-143.1%
MarylandSummer visitorApr 15-21May 15-21Aug 15-211.6%
New JerseySummer visitorApr 15-21May 8-14Sep 1-71.1%
South DakotaSummer visitorApr 22-30Jul 1-7Aug 8-1422%
North DakotaSummer visitorApr 22-30Jul 1-7Aug 8-1418%
WyomingSummer visitorApr 22-30Jul 8-14Aug 8-1419%
MontanaSummer visitorApr 22-30Jul 8-14Aug 8-1413%
MinnesotaSummer visitorApr 22-30Jul 8-14Aug 22-318.5%
MichiganSummer visitorApr 22-30May 22-31Aug 15-212.3%
New YorkSummer visitorApr 22-30Jul 8-14Aug 15-211.1%
PennsylvaniaSummer visitorApr 22-30May 15-21Aug 22-311.7%
VermontSummer visitorApr 22-30May 8-14Aug 8-141.3%
New HampshireSummer visitorMay 1-7Jun 8-14Jul 22-311.2%
AlaskaSummer visitorMay 8-14Jun 8-14Jul 22-313.1%
FloridaPasses throughJul 22-31Aug 15-21Oct 1-71.8%

Passes through: Florida