WhenToBird

Circus hudsonius · Accipitridae

Northern Harrier: When and Where to See It

The Northern Harrier reaches Washington first, around late July, and Tennessee last, around the second week of October.

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: 5.3% of 1114036 checklistsJan 8-14: 5.5% of 824708 checklistsJan 15-21: 5.4% of 825978 checklistsJan 22-31: 5.2% of 1105853 checklistsFeb 1-7: 4.9% of 779772 checklistsFeb 8-14: 4.3% of 864504 checklistsFeb 15-21: 3.6% of 1127933 checklistsFeb 22-28: 4.4% of 840124 checklistsMar 1-7: 4.1% of 839610 checklistsMar 8-14: 3.9% of 870138 checklistsMar 15-21: 3.9% of 898456 checklistsMar 22-31: 3.7% of 1335637 checklistsApr 1-7: 3.5% of 1030617 checklistsApr 8-14: 3.3% of 1124024 checklistsApr 15-21: 2.8% of 1194575 checklistsApr 22-30: 2.1% of 1675723 checklistsMay 1-7: 1.6% of 1449080 checklistsMay 8-14: 1.3% of 1538353 checklistsMay 15-21: 1.2% of 1219898 checklistsMay 22-31: 1.1% of 1452282 checklistsJun 1-7: 1.0% of 900636 checklistsJun 8-14: 0.9% of 829907 checklistsJun 15-21: 0.9% of 773255 checklistsJun 22-30: 0.8% of 916255 checklistsJul 1-7: 0.8% of 717733 checklistsJul 8-14: 0.8% of 658223 checklistsJul 15-21: 0.9% of 638752 checklistsJul 22-31: 0.9% of 895727 checklistsAug 1-7: 1.1% of 655651 checklistsAug 8-14: 1.3% of 650038 checklistsAug 15-21: 1.5% of 654639 checklistsAug 22-31: 1.8% of 974928 checklistsSep 1-7: 2.1% of 765914 checklistsSep 8-14: 2.4% of 738674 checklistsSep 15-21: 3.1% of 750433 checklistsSep 22-30: 3.6% of 944196 checklistsOct 1-7: 3.9% of 760106 checklistsOct 8-14: 4.4% of 793131 checklistsOct 15-21: 5.0% of 728727 checklistsOct 22-31: 5.4% of 959954 checklistsNov 1-7: 5.7% of 709464 checklistsNov 8-14: 6.1% of 693424 checklistsNov 15-21: 6.0% of 653952 checklistsNov 22-30: 5.9% of 871137 checklistsDec 1-7: 5.7% of 627591 checklistsDec 8-14: 5.5% of 642427 checklistsDec 15-21: 5.3% of 775638 checklistsDec 22-31: 5.4% 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 %
South DakotaSummer visitorFeb 8-14Apr 8-14Jan 15-218.0%
WisconsinSummer visitorFeb 15-21Apr 8-14May 15-214.3%
IdahoAll year, most in springMar 1-7Apr 1-7May 1-714%
North DakotaSummer visitorMar 1-7Apr 15-21Nov 1-713%
MinnesotaSummer visitorMar 1-7Apr 8-14Nov 8-144.9%
MontanaAll year, most in springApr 1-7Apr 15-21May 22-3111%
WyomingAll year, most in springApr 1-7Apr 15-21May 8-149.1%
AlaskaSummer visitorApr 8-14May 1-7Oct 15-217.4%
MichiganSummer visitorAug 1-7Apr 15-21May 22-312.7%
MaineSummer visitorAug 8-14Sep 15-21Jan 1-74.1%
New HampshireSummer visitorAug 8-14Sep 22-30May 15-213.0%
ConnecticutSummer visitorAug 15-21Sep 22-30Mar 22-316.5%
NevadaAll year, most in winterOct 8-14Jan 15-21Apr 1-716%
CaliforniaAll year, most in winterOct 8-14Nov 15-21Mar 8-149.6%
GeorgiaWinter visitorOct 8-14Jan 8-14Apr 1-72.5%
KentuckyWinter visitorOct 8-14Dec 8-14Apr 1-74.0%
TennesseeWinter visitorOct 8-14Dec 8-14Mar 15-214.6%
WashingtonWinter visitorJul 22-31Nov 15-21Apr 15-218.3%
MassachusettsWinter visitorJul 22-31Jan 1-7Apr 15-215.6%
VermontWinter visitorAug 1-7Oct 22-31Jan 22-314.0%
UtahWinter visitorAug 8-14Jan 22-31Apr 22-3013%
Rhode IslandWinter visitorAug 8-14Dec 8-14Apr 1-78.6%
ColoradoWinter visitorAug 8-14Dec 8-14May 1-76.3%
DelawareWinter visitorAug 15-21Nov 15-21Apr 8-1417%
NebraskaWinter visitorAug 15-21Oct 15-21Apr 22-307.2%
New YorkWinter visitorAug 15-21Nov 8-14May 1-74.5%
KansasWinter visitorAug 22-31Nov 8-14Apr 8-1413%
New JerseyWinter visitorAug 22-31Oct 15-21Apr 8-1413%
New MexicoWinter visitorAug 22-31Nov 15-21Apr 8-1411%
ArizonaWinter visitorAug 22-31Nov 22-30Mar 8-149.6%
IowaWinter visitorSep 1-7Oct 8-14Apr 22-305.1%
OklahomaWinter visitorSep 8-14Dec 8-14Apr 8-147.5%
OregonAll year, most in winterSep 8-14Nov 15-21Apr 8-1410%
MarylandWinter visitorSep 8-14Nov 8-14Apr 8-144.1%
PennsylvaniaWinter visitorSep 8-14Nov 1-7Apr 8-142.7%
VirginiaWinter visitorSep 8-14Nov 15-21Apr 1-74.3%
TexasWinter visitorSep 15-21Nov 15-21Apr 8-149.1%
IllinoisWinter visitorSep 15-21Jan 8-14Apr 8-144.6%
OhioWinter visitorSep 15-21Jan 22-31Apr 8-144.3%
South CarolinaWinter visitorSep 15-21Nov 15-21Mar 22-314.6%
West VirginiaWinter visitorSep 15-21Dec 8-14Feb 22-282.0%
LouisianaWinter visitorSep 22-30Nov 1-7Mar 15-2112%
MissouriWinter visitorSep 22-30Dec 8-14Apr 1-77.6%
AlabamaWinter visitorSep 22-30Nov 8-14Mar 15-215.1%
ArkansasWinter visitorSep 22-30Nov 8-14Apr 1-75.6%
FloridaWinter visitorSep 22-30Nov 15-21Mar 22-316.9%
IndianaWinter visitorSep 22-30Jan 22-31Apr 8-145.4%
MississippiWinter visitorSep 22-30Nov 22-30Mar 15-217.1%
North CarolinaWinter visitorSep 22-30Jan 1-7Mar 15-213.9%

Passes through: Idaho, Montana, Wyoming

Summer visitor in: South Dakota, Wisconsin, North Dakota, Minnesota, Alaska, Michigan