WhenToBird

Polioptila caerulea · Polioptilidae

When Do Blue-gray Gnatcatchers Arrive in Tennessee?

Adult Blue-gray Gnatcatcher
Photo: Laura Clark, CC BY 4.0 via iNaturalist

Blue-gray Gnatcatchers reach Tennessee in mid March, are common by late March, peak in mid April (37% of checklists), and most are gone by the second week of September.

When to look

First arrivalsMar 15-21mid March
Common byMar 22-31late March
PeakApr 15-21mid April
Most gone bySep 8-14the second week of September

Best: mid April. First arrivals mid March; most are gone by the second week of September. Peak: on about 37% of Tennessee checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Maruncommon
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octrare
  11. Novnot usually seen
  12. Decnot usually seen

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

0%10%20%30%40%Jan 1-7: 0.1% of 16696 checklistsJan 8-14: 0.1% of 13056 checklistsJan 15-21: 0.1% of 13646 checklistsJan 22-31: 0.1% of 18071 checklistsFeb 1-7: 0.1% of 13342 checklistsFeb 8-14: 0.1% of 14316 checklistsFeb 15-21: 0.1% of 20395 checklistsFeb 22-28: 0% of 13129 checklistsMar 1-7: 0.1% of 12701 checklistsMar 8-14: 0.1% of 12789 checklistsMar 15-21: 0.4% of 13599 checklistsMar 22-31: 9.5% of 20293 checklistsApr 1-7: 28% of 15779 checklistsApr 8-14: 37% of 16646 checklistsApr 15-21: 39% of 18625 checklistsApr 22-30: 36% of 26689 checklistsMay 1-7: 32% of 21054 checklistsMay 8-14: 31% of 19954 checklistsMay 15-21: 29% of 14494 checklistsMay 22-31: 26% of 17790 checklistsJun 1-7: 22% of 11344 checklistsJun 8-14: 21% of 11049 checklistsJun 15-21: 21% of 9625 checklistsJun 22-30: 20% of 11522 checklistsJul 1-7: 19% of 9208 checklistsJul 8-14: 18% of 8814 checklistsJul 15-21: 17% of 8887 checklistsJul 22-31: 18% of 12739 checklistsAug 1-7: 17% of 9632 checklistsAug 8-14: 17% of 9514 checklistsAug 15-21: 18% of 9619 checklistsAug 22-31: 19% of 14227 checklistsSep 1-7: 19% of 11988 checklistsSep 8-14: 16% of 11660 checklistsSep 15-21: 9.5% of 11774 checklistsSep 22-30: 4.3% of 15658 checklistsOct 1-7: 1.0% of 12641 checklistsOct 8-14: 0.3% of 12389 checklistsOct 15-21: 0.2% of 10249 checklistsOct 22-31: 0.1% of 14085 checklistsNov 1-7: 0.1% of 10700 checklistsNov 8-14: 0.1% of 10709 checklistsNov 15-21: 0.1% of 9955 checklistsNov 22-30: 0.1% of 13423 checklistsDec 1-7: 0.1% of 10106 checklistsDec 8-14: 0.1% of 10478 checklistsDec 15-21: 0.1% of 12177 checklistsDec 22-31: 0.1% 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. Houston CountyBest the second week of April · 20 checklists that week, 1,234 in all92%
  2. Benton CountyBest the second week of April · 38 checklists that week, 2,202 in all83%
  3. Decatur CountyBest mid April · 11 checklists that week, 378 in all79%
  4. Lewis CountyBest the second week of July · 19 checklists that week, 1,364 in all76%
  5. Perry CountyBest late August · 67 checklists that week, 3,047 in all72%
  6. DeKalb CountyBest mid April · 77 checklists that week, 2,539 in all70%

Best spots

Share of checklists at the peak
  1. Ball CampKnox County, best late April · 20 checklists that week, 124 in all98%
  2. Robbins-Halle Nature PreserveShelby County, best the second week of May · 28 checklists that week, 650 in all94%
  3. Shelby Bottoms (Cooper Creek)Davidson County, best late April · 97 checklists that week, 1,286 in all93%

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

Best time of day

In Tennessee, the Blue-gray Gnatcatcher is most often listed on checklists started between 6 and 8 am (19% of those checklists).

0%10%20%30%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: 23% of 36828 checklists7 am: 18% of 72816 checklists8 am: 15% of 76910 checklists9 am: 12% of 69071 checklists10 am: 11% of 60943 checklists11 am: 9.9% of 52311 checklists12 pm: 8.8% of 46524 checklists1 pm: 9.0% of 41133 checklists2 pm: 8.7% of 40305 checklists3 pm: 8.4% of 41013 checklists4 pm: 9.4% of 40029 checklists5 pm: 13% of 29775 checklists6 pm: 15% 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
January0.1%0.1%0.1%0.1%
February0.1%0.1%0.1%0%
March0.1%0.1%0.4%9.5%
April28%37%39%36%
May32%31%29%26%
June22%21%21%20%
July19%18%17%18%
August17%17%18%19%
September19%16%9.5%4.3%
October1.0%0.3%0.2%0.1%
November0.1%0.1%0.1%0.1%
December0.1%0.1%0.1%0.1%

Neighboring states

  • Kentucky: arrives late March, 1 week later than Tennessee
  • Georgia: arrives late February, 3 weeks earlier than Tennessee
  • Alabama: arrives early March, 2 weeks earlier than Tennessee
  • Indiana: arrives early April, 2 weeks later than Tennessee

Common questions

When do Blue-gray Gnatcatchers arrive in Tennessee?
Blue-gray Gnatcatchers reach Tennessee in mid March, are common by late March, peak in mid April (37% of checklists), and most are gone by the second week of September.
When do Blue-gray Gnatcatchers leave Tennessee?
Most Blue-gray Gnatcatchers have left Tennessee by the second week of September, when reports fall below half their usual rate. Stragglers are still reported until early October.
When is the best time to see a Blue-gray Gnatcatcher in Tennessee?
The Blue-gray Gnatcatcher is reported most often in mid April, on about 37% of Tennessee checklists.
Where in Tennessee are Blue-gray Gnatcatchers seen most often?
By county, Houston County, Benton County, and Decatur County have the highest peak reporting rates for the Blue-gray Gnatcatcher (counties with at least 200 checklists).