WhenToBird

Setophaga caerulescens · Parulidae

When Do Black-throated Blue Warblers Arrive in North Carolina?

Adult male Black-throated Blue Warbler
Photo: Dan Vickers, CC BY 4.0 via iNaturalist

Black-throated Blue Warblers reach North Carolina in the second week of April, are common by mid April, peak in early May (11% of checklists), and most are gone by late October.

When to look

First arrivalsApr 8-14the second week of April
Common byApr 15-21mid April
PeakMay 1-7early May
Most gone byOct 22-31late October

Best: early May. First arrivals the second week of April; most are gone by late October. Peak: on about 11% of North Carolina checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprpeak season
  5. Maypeak season
  6. Jununcommon
  7. Juluncommon
  8. Auguncommon
  9. Sepcommon
  10. Octcommon
  11. Novrare
  12. Decnot usually seen

Darker months: more checklists report it. Outlined: peak month.

0%5%10%15%Jan 1-7: 0% of 30085 checklistsJan 8-14: 0% of 22728 checklistsJan 15-21: 0% of 24292 checklistsJan 22-31: 0% of 34122 checklistsFeb 1-7: 0% of 26352 checklistsFeb 8-14: 0% of 29663 checklistsFeb 15-21: 0% of 41515 checklistsFeb 22-28: 0.1% of 24318 checklistsMar 1-7: 0.1% of 23408 checklistsMar 8-14: 0% of 22658 checklistsMar 15-21: 0.1% of 22784 checklistsMar 22-31: 0.1% of 36034 checklistsApr 1-7: 0.1% of 28131 checklistsApr 8-14: 0.3% of 29190 checklistsApr 15-21: 2.4% of 32847 checklistsApr 22-30: 11% of 47966 checklistsMay 1-7: 15% of 37076 checklistsMay 8-14: 9.4% of 36228 checklistsMay 15-21: 4.3% of 30378 checklistsMay 22-31: 3.2% of 40237 checklistsJun 1-7: 2.9% of 27551 checklistsJun 8-14: 3.1% of 26473 checklistsJun 15-21: 3.5% of 22789 checklistsJun 22-30: 2.3% of 27615 checklistsJul 1-7: 2.3% of 20022 checklistsJul 8-14: 1.9% of 19315 checklistsJul 15-21: 1.5% of 18934 checklistsJul 22-31: 1.4% of 25600 checklistsAug 1-7: 1.3% of 17987 checklistsAug 8-14: 1.6% of 17307 checklistsAug 15-21: 1.9% of 17080 checklistsAug 22-31: 2.3% of 25844 checklistsSep 1-7: 3.4% of 20818 checklistsSep 8-14: 4.3% of 20070 checklistsSep 15-21: 5.5% of 21984 checklistsSep 22-30: 6.2% of 26979 checklistsOct 1-7: 8.1% of 22605 checklistsOct 8-14: 9.1% of 22677 checklistsOct 15-21: 6.8% of 21407 checklistsOct 22-31: 2.3% of 25927 checklistsNov 1-7: 0.2% of 18830 checklistsNov 8-14: 0.1% of 18418 checklistsNov 15-21: 0% of 19101 checklistsNov 22-30: 0.1% of 25709 checklistsDec 1-7: 0.1% of 18856 checklistsDec 8-14: 0.1% of 18745 checklistsDec 15-21: 0% of 22478 checklistsDec 22-31: 0% of 34796 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in North Carolina that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

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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Where in North Carolina

Best counties

Share of checklists at the peak
  1. Avery CountyBest the second week of May · 301 checklists that week, 8,724 in all36%
  2. Mitchell CountyBest the second week of September · 77 checklists that week, 2,981 in all35%
  3. Yancey CountyBest the second week of September · 251 checklists that week, 11,714 in all32%
  4. Macon CountyBest early May · 306 checklists that week, 7,412 in all29%
  5. Graham CountyBest the second week of May · 160 checklists that week, 2,381 in all29%
  6. Alleghany CountyBest late September · 161 checklists that week, 2,311 in all27%

Best spots

Share of checklists at the peak
  1. Trout Lake (northeast)Watauga County, best late May · 23 checklists that week, 322 in all100%
  2. Trout LakeWatauga County, best early May · 68 checklists that week, 1,478 in all89%
  3. Cradle of Forestry in America National Historic AreaTransylvania County, best late April · 43 checklists that week, 393 in all83%
  4. Mecklenburg County Open Space - Latta ParkMecklenburg County, best early May · 332 checklists that week, 1,868 in all83%
  5. City of Greensboro - Hamilton Lakes ParkGuilford County, best early May · 50 checklists that week, 511 in all80%
  6. Linville FallsBurke County, best late May · 25 checklists that week, 280 in all79%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In North Carolina, the Black-throated Blue Warbler is most often listed on checklists started between 6 and 8 am (4.1% of those checklists).

0%2%4%6%12 am: too few checklists (520) to judge1 am: too few checklists (489) to judge2 am: too few checklists (442) to judge3 am: too few checklists (544) to judge4 am: too few checklists (1621) to judge5 am: too few checklists (9671) to judge6 am: 4.3% of 50335 checklists7 am: 4.1% of 150152 checklists8 am: 3.6% of 182902 checklists9 am: 3.3% of 158933 checklists10 am: 2.8% of 128398 checklists11 am: 2.4% of 98671 checklists12 pm: 2.0% of 78640 checklists1 pm: 1.9% of 72510 checklists2 pm: 1.8% of 69179 checklists3 pm: 1.6% of 67669 checklists4 pm: 1.5% of 63964 checklists5 pm: 1.5% of 48520 checklists6 pm: 1.1% of 33196 checklists7 pm: too few checklists (19700) to judge8 pm: too few checklists (6160) to judge9 pm: too few checklists (1943) to judge10 pm: too few checklists (1119) to judge11 pm: too few checklists (651) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January0%0%0%0%
February0%0%0%0.1%
March0.1%0%0.1%0.1%
April0.1%0.3%2.4%11%
May15%9.4%4.3%3.2%
June2.9%3.1%3.5%2.3%
July2.3%1.9%1.5%1.4%
August1.3%1.6%1.9%2.3%
September3.4%4.3%5.5%6.2%
October8.1%9.1%6.8%2.3%
November0.2%0.1%0%0.1%
December0.1%0.1%0%0%

Neighboring states

  • South Carolina: arrives the second week of April, in the same week than North Carolina
  • Virginia: arrives mid April, 1 week later than North Carolina
  • West Virginia: arrives late April, 2 weeks later than North Carolina
  • District of Columbia: arrives mid April, 1 week later than North Carolina

Common questions

When do Black-throated Blue Warblers arrive in North Carolina?
Black-throated Blue Warblers reach North Carolina in the second week of April, are common by mid April, peak in early May (11% of checklists), and most are gone by late October.
When do Black-throated Blue Warblers leave North Carolina?
Most Black-throated Blue Warblers have left North Carolina by late October, when reports fall below half their usual rate. Stragglers are still reported until early November.
When is the best time to see a Black-throated Blue Warbler in North Carolina?
The Black-throated Blue Warbler is reported most often in early May, on about 11% of North Carolina checklists.
Where in North Carolina are Black-throated Blue Warblers seen most often?
By county, Avery County, Mitchell County, and Yancey County have the highest peak reporting rates for the Black-throated Blue Warbler (counties with at least 200 checklists).