WhenToBird

Helmitheros vermivorum · Parulidae

Worm-eating Warbler: When and Where to See It

Adult Worm-eating Warbler
Photo: kirk gardner, CC BY 4.0 via iNaturalist

The Worm-eating Warbler reaches Mississippi first, around mid March, and Rhode Island last, around early 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%0.5%1%1.5%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: 0.1% of 840124 checklistsMar 1-7: 0.1% of 839610 checklistsMar 8-14: 0.1% of 870138 checklistsMar 15-21: 0.1% of 898456 checklistsMar 22-31: 0.1% of 1335637 checklistsApr 1-7: 0.4% of 1030617 checklistsApr 8-14: 0.7% of 1124024 checklistsApr 15-21: 1.1% of 1194575 checklistsApr 22-30: 1.2% of 1675723 checklistsMay 1-7: 1.2% of 1449080 checklistsMay 8-14: 1.0% of 1538353 checklistsMay 15-21: 0.9% of 1219898 checklistsMay 22-31: 0.7% of 1452282 checklistsJun 1-7: 0.7% of 900636 checklistsJun 8-14: 0.7% of 829907 checklistsJun 15-21: 0.6% of 773255 checklistsJun 22-30: 0.5% of 916255 checklistsJul 1-7: 0.4% of 717733 checklistsJul 8-14: 0.3% of 658223 checklistsJul 15-21: 0.2% of 638752 checklistsJul 22-31: 0.1% 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: 0.4% of 974928 checklistsSep 1-7: 0.5% of 765914 checklistsSep 8-14: 0.5% of 738674 checklistsSep 15-21: 0.4% 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 %
MississippiPasses throughMar 15-21Apr 8-14Jun 22-303.6%
AlabamaSummer visitorMar 22-31Apr 15-21Jun 15-215.5%
LouisianaPasses throughMar 22-31Apr 8-14May 1-74.0%
TexasPasses throughMar 22-31Apr 8-14Apr 22-303.6%
GeorgiaSummer visitorApr 1-7Apr 22-30Jun 15-212.9%
South CarolinaSummer visitorApr 1-7Apr 22-30Jun 22-302.4%
District of ColumbiaPasses throughApr 8-14Apr 22-30May 22-312.7%
North CarolinaSummer visitorApr 8-14Apr 22-30Jul 8-144.0%
TennesseeSummer visitorApr 8-14Apr 22-30Jul 8-143.8%
ArkansasSummer visitorApr 8-14Jun 1-7Jul 1-72.0%
DelawareSummer visitorApr 15-21May 1-7Jul 1-73.8%
KentuckySummer visitorApr 15-21May 1-7Jun 22-302.9%
MarylandSummer visitorApr 15-21May 8-14Jul 8-143.6%
New JerseySummer visitorApr 15-21May 8-14Jul 1-73.5%
VirginiaSummer visitorApr 15-21May 1-7Jul 8-144.3%
West VirginiaSummer visitorApr 15-21May 22-31Jul 1-74.9%
IndianaSummer visitorApr 15-21May 1-7Jul 1-71.2%
MissouriSummer visitorApr 15-21May 1-7Jul 1-72.0%
ConnecticutSummer visitorApr 22-30May 15-21Jul 1-75.1%
PennsylvaniaSummer visitorApr 22-30May 8-14Jul 1-72.5%
New YorkPasses throughApr 22-30May 8-14Jun 22-301.6%
Rhode IslandPasses throughMay 1-7Jun 1-7Jun 22-302.2%
FloridaSummer visitorAug 8-14Sep 15-21Nov 8-144.1%

Summer visitor in: Florida