WhenToBird

Astur cooperii · Accipitridae

Cooper's Hawk: When and Where to See It

Adult male Cooper's Hawk
Photo: Shirley Zundell, CC BY 4.0 via iNaturalist

The Cooper's Hawk reaches South Carolina first, around late May, and New Jersey 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%5%10%Jan 1-7: 4.7% of 1114036 checklistsJan 8-14: 4.7% of 824708 checklistsJan 15-21: 4.6% of 825978 checklistsJan 22-31: 4.5% of 1105853 checklistsFeb 1-7: 4.3% of 779772 checklistsFeb 8-14: 4.2% of 864504 checklistsFeb 15-21: 4.1% of 1127933 checklistsFeb 22-28: 4.3% of 840124 checklistsMar 1-7: 4.5% of 839610 checklistsMar 8-14: 4.8% of 870138 checklistsMar 15-21: 5.0% of 898456 checklistsMar 22-31: 5.1% of 1335637 checklistsApr 1-7: 5.2% of 1030617 checklistsApr 8-14: 5.2% of 1124024 checklistsApr 15-21: 5.0% of 1194575 checklistsApr 22-30: 4.8% of 1675723 checklistsMay 1-7: 4.4% of 1449080 checklistsMay 8-14: 3.6% of 1538353 checklistsMay 15-21: 3.2% of 1219898 checklistsMay 22-31: 2.8% of 1452282 checklistsJun 1-7: 2.7% of 900636 checklistsJun 8-14: 2.8% of 829907 checklistsJun 15-21: 2.9% of 773255 checklistsJun 22-30: 2.9% of 916255 checklistsJul 1-7: 3.1% of 717733 checklistsJul 8-14: 3.1% of 658223 checklistsJul 15-21: 3.3% of 638752 checklistsJul 22-31: 3.5% of 895727 checklistsAug 1-7: 4.0% of 655651 checklistsAug 8-14: 4.3% of 650038 checklistsAug 15-21: 4.6% of 654639 checklistsAug 22-31: 5.2% of 974928 checklistsSep 1-7: 5.9% of 765914 checklistsSep 8-14: 6.4% of 738674 checklistsSep 15-21: 7.4% of 750433 checklistsSep 22-30: 7.9% of 944196 checklistsOct 1-7: 8.1% of 760106 checklistsOct 8-14: 8.0% of 793131 checklistsOct 15-21: 8.0% of 728727 checklistsOct 22-31: 7.1% of 959954 checklistsNov 1-7: 6.4% of 709464 checklistsNov 8-14: 6.1% of 693424 checklistsNov 15-21: 5.7% of 653952 checklistsNov 22-30: 5.4% of 871137 checklistsDec 1-7: 5.4% of 627591 checklistsDec 8-14: 5.4% of 642427 checklistsDec 15-21: 5.5% of 775638 checklistsDec 22-31: 5.0% 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 %
MinnesotaSummer visitorMar 8-14Sep 8-14Oct 15-216.0%
North DakotaSummer visitorMar 15-21Aug 22-31Oct 1-78.5%
ColoradoAll year, most in springMar 22-31Apr 22-30May 15-216.8%
MontanaSummer visitorApr 1-7Sep 8-14Oct 22-313.8%
IowaSummer visitorJun 15-21Sep 15-21May 15-217.4%
NebraskaSummer visitorJun 15-21Sep 22-30May 15-217.3%
New HampshireSummer visitorJun 22-30Sep 22-30Feb 1-76.1%
OregonSummer visitorJun 22-30Sep 22-30May 1-75.0%
MaineSummer visitorJul 1-7Sep 15-21Feb 22-283.7%
South DakotaSummer visitorJul 1-7Apr 22-30Jun 1-73.9%
MichiganSummer visitorJul 8-14Sep 22-30May 8-145.6%
WyomingSummer visitorJul 8-14Sep 8-14Jun 8-142.5%
VermontSummer visitorJul 15-21Sep 15-21May 22-312.9%
KentuckyAll year, most in fallAug 15-21Oct 8-14Nov 1-77.6%
IllinoisAll year, most in fallAug 22-31Sep 22-30Nov 1-714%
WisconsinAll year, most in fallAug 22-31Sep 15-21Oct 15-216.2%
OhioAll year, most in fallSep 1-7Oct 8-14Nov 8-147.9%
KansasAll year, most in fallSep 1-7Oct 1-7Nov 1-77.3%
IndianaAll year, most in fallSep 8-14Oct 1-7Nov 8-148.2%
PennsylvaniaAll year, most in fallSep 8-14Oct 8-14Nov 15-219.4%
New JerseyAll year, most in fallSep 15-21Oct 8-14Nov 8-1423%
South CarolinaWinter visitorMay 22-31Oct 8-14Apr 15-214.7%
FloridaWinter visitorJun 1-7Oct 8-14Apr 22-305.8%
North CarolinaWinter visitorJun 8-14Oct 8-14May 1-75.3%
West VirginiaWinter visitorJun 8-14Oct 1-7May 1-75.1%
MississippiWinter visitorJun 8-14Oct 22-31May 1-74.5%
MissouriWinter visitorJun 15-21Oct 1-7May 8-145.9%
OklahomaWinter visitorJun 15-21Oct 1-7Apr 22-306.1%
ArkansasWinter visitorJun 15-21Oct 15-21Apr 22-303.4%
VirginiaWinter visitorJul 1-7Oct 8-14Apr 22-307.2%
District of ColumbiaWinter visitorJul 15-21Nov 1-7Apr 1-712%
New YorkWinter visitorJul 15-21Oct 15-21Apr 22-307.9%
ConnecticutWinter visitorJul 22-31Oct 8-14Apr 22-3012%
Rhode IslandWinter visitorJul 22-31Oct 8-14May 15-2112%
MassachusettsAll year, most in fallAug 22-31Oct 1-7Nov 8-149.9%
LouisianaAll year, most in fallAug 22-31Oct 8-14Dec 22-316.6%
NevadaAll year, most in fallSep 1-7Sep 22-30Jan 8-1417%
DelawareAll year, most in fallSep 1-7Oct 8-14Dec 1-712%
IdahoAll year, most in fallSep 1-7Sep 15-21Jan 15-218.0%
MarylandAll year, most in fallSep 8-14Oct 8-14Nov 22-308.9%
TexasAll year, most in fallSep 8-14Oct 8-14Dec 15-218.1%
ArizonaYear-round–Oct 1-7–19%
New MexicoYear-round–Apr 8-14–12%
CaliforniaYear-round–Sep 22-30–11%
TennesseeYear-round–Oct 8-14–6.5%
UtahYear-round–Sep 15-21–6.9%
WashingtonYear-round–Oct 1-7–6.6%
AlabamaYear-round–Oct 15-21–5.1%
GeorgiaYear-round–Oct 15-21–5.6%

Passes through: Colorado

Summer visitor in: South Dakota, Minnesota, North Dakota, Montana