WhenToBird

Larus fuscus · Laridae

Lesser Black-backed Gull: When and Where to See It

Adult Lesser Black-backed Gull
Photo: danielarah, CC0 1.0 via iNaturalist

The Lesser Black-backed Gull reaches Georgia first, around late July, and Iowa last, around mid November.

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%0.5%1%Jan 1-7: 0.8% of 1114036 checklistsJan 8-14: 0.8% of 824708 checklistsJan 15-21: 0.8% of 825978 checklistsJan 22-31: 0.9% of 1105853 checklistsFeb 1-7: 0.8% of 779772 checklistsFeb 8-14: 0.7% of 864504 checklistsFeb 15-21: 0.6% of 1127933 checklistsFeb 22-28: 0.7% of 840124 checklistsMar 1-7: 0.6% of 839610 checklistsMar 8-14: 0.6% of 870138 checklistsMar 15-21: 0.5% of 898456 checklistsMar 22-31: 0.5% of 1335637 checklistsApr 1-7: 0.4% of 1030617 checklistsApr 8-14: 0.3% of 1124024 checklistsApr 15-21: 0.2% of 1194575 checklistsApr 22-30: 0.2% of 1675723 checklistsMay 1-7: 0.1% of 1449080 checklistsMay 8-14: 0.1% of 1538353 checklistsMay 15-21: 0.1% of 1219898 checklistsMay 22-31: 0.1% of 1452282 checklistsJun 1-7: 0.1% of 900636 checklistsJun 8-14: 0.1% of 829907 checklistsJun 15-21: 0.1% of 773255 checklistsJun 22-30: 0.1% of 916255 checklistsJul 1-7: 0.1% of 717733 checklistsJul 8-14: 0.2% of 658223 checklistsJul 15-21: 0.2% of 638752 checklistsJul 22-31: 0.2% of 895727 checklistsAug 1-7: 0.2% of 655651 checklistsAug 8-14: 0.2% of 650038 checklistsAug 15-21: 0.3% of 654639 checklistsAug 22-31: 0.3% of 974928 checklistsSep 1-7: 0.4% of 765914 checklistsSep 8-14: 0.5% of 738674 checklistsSep 15-21: 0.6% of 750433 checklistsSep 22-30: 0.7% of 944196 checklistsOct 1-7: 0.6% of 760106 checklistsOct 8-14: 0.7% of 793131 checklistsOct 15-21: 0.8% of 728727 checklistsOct 22-31: 0.7% of 959954 checklistsNov 1-7: 0.8% of 709464 checklistsNov 8-14: 0.8% of 693424 checklistsNov 15-21: 0.9% of 653952 checklistsNov 22-30: 0.9% of 871137 checklistsDec 1-7: 0.9% of 627591 checklistsDec 8-14: 0.9% of 642427 checklistsDec 15-21: 0.8% of 775638 checklistsDec 22-31: 0.9% 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 %
MassachusettsSummer visitorJun 15-21Sep 8-14Apr 8-141.1%
Rhode IslandSummer visitorJul 15-21Sep 15-21Feb 1-73.0%
MainePasses throughAug 15-21Sep 8-14Oct 15-211.4%
District of ColumbiaPasses throughNov 15-21Dec 8-14Jan 15-211.8%
IllinoisWinter visitorOct 15-21Jan 22-31Mar 1-71.1%
OhioWinter visitorOct 15-21Jan 8-14Apr 1-71.9%
PennsylvaniaWinter visitorOct 22-31Jan 15-21Mar 15-211.9%
UtahWinter visitorNov 1-7Jan 22-31Mar 15-211.4%
IowaWinter visitorNov 15-21Dec 8-14Mar 22-311.1%
NevadaWinter visitorDec 1-7Jan 8-14Feb 8-141.2%
DelawareWinter visitorMay 15-21Nov 15-21Apr 8-144.7%
New YorkWinter visitorMay 22-31Nov 15-21Apr 8-141.2%
New JerseyWinter visitorJun 22-30Oct 8-14Apr 15-215.5%
VirginiaWinter visitorJul 15-21Jan 22-31Apr 1-71.6%
GeorgiaWinter visitorJul 22-31Oct 8-14Dec 22-311.1%
North CarolinaWinter visitorAug 8-14Nov 22-30Apr 1-72.3%
FloridaWinter visitorSep 8-14Dec 15-21Apr 1-72.7%
KentuckyWinter visitorSep 8-14Jan 22-31Mar 15-211.1%
North DakotaWinter visitorSep 8-14Dec 1-7Jan 1-71.3%
NebraskaWinter visitorSep 8-14Nov 15-21Apr 1-71.1%
OklahomaWinter visitorSep 8-14Jan 15-21Mar 8-142.3%
MichiganWinter visitorSep 15-21Nov 22-30Apr 8-141.3%
ColoradoWinter visitorSep 22-30Jan 1-7Apr 1-71.6%
KansasWinter visitorSep 22-30Feb 1-7Mar 15-211.0%
South DakotaWinter visitorSep 22-30Nov 22-30Jan 22-312.4%

Winter visitor in: Nevada, Delaware, New York, New Jersey, Virginia

Passes through: Maine

Summer visitor in: Massachusetts, Rhode Island