WhenToBird

Setophaga castanea · Parulidae

When Do Bay-breasted Warblers Arrive in Tennessee?

Adult Bay-breasted Warbler
Photo: Roger A. Morales-Flores, CC BY 4.0 via iNaturalist

Bay-breasted Warblers mostly pass through Tennessee: the first show up in early September, they are common by the second week of September, peak in early October (11% of checklists), and most are gone by late October.

When to look

First arrivalsSep 1-7early September
Common bySep 8-14the second week of September
PeakOct 1-7early October
Most gone byOct 22-31late October

Best: early October. First arrivals early September; most are gone by late October. Peak: on about 11% of Tennessee checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Apruncommon
  5. Maycommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Seppeak season
  10. Octpeak season
  11. Novrare
  12. Decnot usually seen

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

0%5%10%15%Jan 1-7: 0% of 16696 checklistsJan 8-14: 0% of 13056 checklistsJan 15-21: 0% of 13646 checklistsJan 22-31: 0% of 18071 checklistsFeb 1-7: 0% of 13342 checklistsFeb 8-14: 0% of 14316 checklistsFeb 15-21: 0% of 20395 checklistsFeb 22-28: 0% of 13129 checklistsMar 1-7: 0% of 12701 checklistsMar 8-14: 0% of 12789 checklistsMar 15-21: 0% of 13599 checklistsMar 22-31: 0% of 20293 checklistsApr 1-7: 0% of 15779 checklistsApr 8-14: 0% of 16646 checklistsApr 15-21: 0.1% of 18625 checklistsApr 22-30: 1.5% of 26689 checklistsMay 1-7: 7.1% of 21054 checklistsMay 8-14: 8.4% of 19954 checklistsMay 15-21: 2.9% of 14494 checklistsMay 22-31: 0.2% of 17790 checklistsJun 1-7: 0% of 11344 checklistsJun 8-14: 0.1% of 11049 checklistsJun 15-21: 0% of 9625 checklistsJun 22-30: 0% of 11522 checklistsJul 1-7: 0% of 9208 checklistsJul 8-14: 0% of 8814 checklistsJul 15-21: 0% of 8887 checklistsJul 22-31: 0% of 12739 checklistsAug 1-7: 0% of 9632 checklistsAug 8-14: 0% of 9514 checklistsAug 15-21: 0.1% of 9619 checklistsAug 22-31: 0.1% of 14227 checklistsSep 1-7: 0.9% of 11988 checklistsSep 8-14: 2.8% of 11660 checklistsSep 15-21: 5.5% of 11774 checklistsSep 22-30: 9.2% of 15658 checklistsOct 1-7: 13% of 12641 checklistsOct 8-14: 11% of 12389 checklistsOct 15-21: 5.5% of 10249 checklistsOct 22-31: 1.6% of 14085 checklistsNov 1-7: 0.1% of 10700 checklistsNov 8-14: 0% of 10709 checklistsNov 15-21: 0% of 9955 checklistsNov 22-30: 0% of 13423 checklistsDec 1-7: 0% of 10106 checklistsDec 8-14: 0% of 10478 checklistsDec 15-21: 0% of 12177 checklistsDec 22-31: 0% of 17397 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 Tennessee 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 Tennessee

Best counties

Share of checklists at the peak
  1. Hamblen CountyBest late September · 27 checklists that week, 1,320 in all31%
  2. Perry CountyBest late September · 109 checklists that week, 3,047 in all25%
  3. Morgan CountyBest mid September · 23 checklists that week, 1,042 in all23%
  4. Stewart CountyBest early October · 93 checklists that week, 4,246 in all22%
  5. Henry CountyBest early October · 95 checklists that week, 5,668 in all21%
  6. Campbell CountyBest early October · 45 checklists that week, 3,619 in all20%

Best spots

Share of checklists at the peak
  1. Radnor LakeDavidson County, best the second week of May · 560 checklists that week, 9,438 in all71%
  2. Rock SpringHamilton County, best the second week of October · 101 checklists that week, 1,954 in all66%
  3. Kingsport ReservoirSullivan County, best late September · 20 checklists that week, 541 in all57%
  4. Walker Springs ParkKnox County, best early October · 70 checklists that week, 1,326 in all43%
  5. Sharps Ridge Memorial ParkKnox County, best the second week of May · 156 checklists that week, 2,421 in all42%
  6. Clark Center ParkAnderson County, best mid September · 22 checklists that week, 257 in all42%

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

Best time of day

In Tennessee, the Bay-breasted Warbler is most often listed on checklists started between 6 and 8 am (3.2% of those checklists).

0%1%2%3%4%12 am: too few checklists (224) to judge1 am: too few checklists (253) to judge2 am: too few checklists (245) to judge3 am: too few checklists (267) to judge4 am: too few checklists (582) to judge5 am: too few checklists (5688) to judge6 am: 3.7% of 36828 checklists7 am: 2.9% of 72816 checklists8 am: 2.3% of 76910 checklists9 am: 1.6% of 69071 checklists10 am: 1.3% of 60943 checklists11 am: 1.0% of 52311 checklists12 pm: 1.0% of 46524 checklists1 pm: 1.0% of 41133 checklists2 pm: 0.9% of 40305 checklists3 pm: 1.1% of 41013 checklists4 pm: 1.1% of 40029 checklists5 pm: 1.1% of 29775 checklists6 pm: 0.6% of 20977 checklists7 pm: too few checklists (12529) to judge8 pm: too few checklists (4456) to judge9 pm: too few checklists (1056) to judge10 pm: too few checklists (445) to judge11 pm: too few checklists (252) 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%
March0%0%0%0%
April0%0%0.1%1.5%
May7.1%8.4%2.9%0.2%
June0%0.1%0%0%
July0%0%0%0%
August0%0%0.1%0.1%
September0.9%2.8%5.5%9.2%
October13%11%5.5%1.6%
November0.1%0%0%0%
December0%0%0%0%

Neighboring states

  • Kentucky: arrives late August, 1 week earlier than Tennessee
  • Georgia: arrives mid September, 2 weeks later than Tennessee
  • Alabama: arrives mid April, 18 weeks earlier than Tennessee
  • Indiana: arrives mid August, 2 weeks earlier than Tennessee

Common questions

When do Bay-breasted Warblers arrive in Tennessee?
Bay-breasted Warblers mostly pass through Tennessee: the first show up in early September, they are common by the second week of September, peak in early October (11% of checklists), and most are gone by late October.
When do Bay-breasted Warblers leave Tennessee?
Most Bay-breasted Warblers have left Tennessee by late October, when reports fall below half their usual rate.
When is the best time to see a Bay-breasted Warbler in Tennessee?
The Bay-breasted Warbler is reported most often in early October, on about 11% of Tennessee checklists.
Where in Tennessee are Bay-breasted Warblers seen most often?
By county, Hamblen County, Perry County, and Morgan County have the highest peak reporting rates for the Bay-breasted Warbler (counties with at least 200 checklists).