WhenToBird

Aythya marila · Anatidae

Greater Scaup: When and Where to See It

Adult Greater Scaup
Photo: Se Lena, CC BY 4.0 via iNaturalist

The Greater Scaup reaches Washington first, around late September, and West Virginia last, around the second week of January.

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%1%2%3%Jan 1-7: 2.1% of 1114036 checklistsJan 8-14: 2.2% of 824708 checklistsJan 15-21: 2.3% of 825978 checklistsJan 22-31: 2.3% of 1105853 checklistsFeb 1-7: 2.3% of 779772 checklistsFeb 8-14: 2.0% of 864504 checklistsFeb 15-21: 1.7% of 1127933 checklistsFeb 22-28: 2.3% of 840124 checklistsMar 1-7: 2.3% of 839610 checklistsMar 8-14: 2.1% of 870138 checklistsMar 15-21: 1.9% of 898456 checklistsMar 22-31: 1.6% of 1335637 checklistsApr 1-7: 1.3% of 1030617 checklistsApr 8-14: 1.0% of 1124024 checklistsApr 15-21: 0.8% of 1194575 checklistsApr 22-30: 0.6% of 1675723 checklistsMay 1-7: 0.4% of 1449080 checklistsMay 8-14: 0.3% of 1538353 checklistsMay 15-21: 0.3% of 1219898 checklistsMay 22-31: 0.3% of 1452282 checklistsJun 1-7: 0.3% of 900636 checklistsJun 8-14: 0.3% of 829907 checklistsJun 15-21: 0.2% of 773255 checklistsJun 22-30: 0.2% 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: 0.1% of 974928 checklistsSep 1-7: 0.1% of 765914 checklistsSep 8-14: 0.1% of 738674 checklistsSep 15-21: 0.1% of 750433 checklistsSep 22-30: 0.2% of 944196 checklistsOct 1-7: 0.3% of 760106 checklistsOct 8-14: 0.4% of 793131 checklistsOct 15-21: 0.6% of 728727 checklistsOct 22-31: 0.9% of 959954 checklistsNov 1-7: 1.1% of 709464 checklistsNov 8-14: 1.2% of 693424 checklistsNov 15-21: 1.3% of 653952 checklistsNov 22-30: 1.3% of 871137 checklistsDec 1-7: 1.5% of 627591 checklistsDec 8-14: 1.5% of 642427 checklistsDec 15-21: 1.4% of 775638 checklistsDec 22-31: 1.7% 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 %
MontanaSummer visitorFeb 22-28Apr 8-14May 8-142.4%
MinnesotaSummer visitorMar 1-7Apr 8-14May 15-212.8%
North DakotaPasses throughMar 15-21Apr 15-21May 8-144.2%
AlaskaAll year, most in springMay 1-7May 22-31Jun 15-2112%
Rhode IslandWinter visitorOct 1-7Jan 22-31Apr 1-710%
MaineWinter visitorOct 8-14Nov 1-7Feb 1-72.6%
MichiganWinter visitorOct 8-14Mar 1-7Apr 22-304.2%
OregonWinter visitorOct 8-14Mar 1-7Apr 15-212.5%
VermontWinter visitorOct 8-14Mar 8-14Apr 15-212.2%
New YorkWinter visitorOct 15-21Jan 22-31Apr 1-76.5%
WisconsinWinter visitorOct 15-21Mar 1-7Apr 22-304.1%
CaliforniaWinter visitorOct 22-31Jan 15-21Apr 15-213.5%
MassachusettsWinter visitorOct 22-31Jan 15-21Apr 1-74.0%
HawaiiWinter visitorOct 22-31Nov 15-21Feb 22-281.0%
New HampshireWinter visitorOct 22-31Mar 8-14Apr 8-142.0%
IllinoisWinter visitorNov 1-7Mar 1-7Apr 1-75.1%
OklahomaWinter visitorNov 1-7Jan 8-14Mar 15-212.7%
ArkansasWinter visitorNov 1-7Jan 8-14Mar 8-141.4%
KansasWinter visitorNov 1-7Jan 15-21Apr 8-142.0%
NevadaWinter visitorNov 1-7Dec 1-7Apr 1-71.4%
South DakotaWinter visitorNov 1-7Mar 22-31Apr 15-212.0%
DelawareWinter visitorNov 8-14Jan 22-31Mar 15-213.4%
New JerseyWinter visitorNov 8-14Jan 22-31Mar 22-313.9%
AlabamaWinter visitorNov 8-14Jan 15-21Mar 1-71.9%
ColoradoWinter visitorNov 8-14Mar 15-21Apr 15-211.1%
District of ColumbiaWinter visitorNov 8-14Feb 8-14Mar 22-311.7%
PennsylvaniaWinter visitorNov 8-14Mar 8-14Apr 15-212.2%
MarylandWinter visitorNov 15-21Jan 22-31Mar 22-314.1%
IowaWinter visitorNov 15-21Mar 8-14Apr 8-141.1%
MississippiWinter visitorNov 15-21Jan 15-21Mar 8-141.4%
TennesseeWinter visitorNov 15-21Jan 22-31Mar 15-211.3%
ConnecticutWinter visitorNov 22-30Jan 22-31Mar 22-315.4%
IndianaWinter visitorNov 22-30Mar 1-7Apr 1-72.5%
VirginiaWinter visitorDec 15-21Jan 22-31Mar 22-311.6%
OhioWinter visitorDec 22-31Mar 1-7Apr 1-73.3%
KentuckyWinter visitorDec 22-31Feb 1-7Mar 22-311.8%
West VirginiaWinter visitorJan 8-14Feb 1-7Apr 1-72.3%
NebraskaWinter visitorFeb 22-28Mar 15-21Apr 22-301.8%
WashingtonWinter visitorSep 22-30Jan 15-21Apr 22-304.7%

Winter visitor in: Maine, Nebraska

Passes through: North Dakota, Alaska

Summer visitor in: Montana, Minnesota