WhenToBird

Empidonax alnorum · Tyrannidae

When Do Alder Flycatchers Arrive in Louisiana?

Adult Alder Flycatcher
Photo: Brandon Johnson, CC BY 4.0 via iNaturalist

Alder Flycatchers mostly pass through Louisiana: they arrive in mid August, peak in early September (2.2% of checklists), and most are gone by mid September.

When to look

First arrivalsAug 15-21mid August
Common byAug 15-21mid August
PeakSep 1-7early September
Most gone bySep 15-21mid September

Best: early September. First arrivals mid August; most are gone by mid September. Peak: on about 2.2% of Louisiana checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Mayrare
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augpeak season
  9. Seppeak season
  10. Octrare
  11. Novnot usually seen
  12. Decnot usually seen

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

0%1%2%3%Jan 1-7: 0% of 8384 checklistsJan 8-14: 0% of 6265 checklistsJan 15-21: 0% of 6825 checklistsJan 22-31: 0% of 8776 checklistsFeb 1-7: 0% of 5956 checklistsFeb 8-14: 0% of 6291 checklistsFeb 15-21: 0% of 8044 checklistsFeb 22-28: 0% of 5946 checklistsMar 1-7: 0% of 5981 checklistsMar 8-14: 0% of 6307 checklistsMar 15-21: 0% of 6747 checklistsMar 22-31: 0% of 10487 checklistsApr 1-7: 0% of 8037 checklistsApr 8-14: 0% of 9577 checklistsApr 15-21: 0% of 11372 checklistsApr 22-30: 0% of 14344 checklistsMay 1-7: 0.1% of 8193 checklistsMay 8-14: 0.2% of 6823 checklistsMay 15-21: 0.2% of 4818 checklistsMay 22-31: 0.1% of 6206 checklistsJun 1-7: 0% of 3660 checklistsJun 8-14: 0% of 3455 checklistsJun 15-21: 0% of 3084 checklistsJun 22-30: 0% of 3904 checklistsJul 1-7: 0% of 3240 checklistsJul 8-14: 0% of 3235 checklistsJul 15-21: 0% of 3167 checklistsJul 22-31: 0% of 4328 checklistsAug 1-7: 0.1% of 3192 checklistsAug 8-14: 0.3% of 3394 checklistsAug 15-21: 1.4% of 3502 checklistsAug 22-31: 1.6% of 5658 checklistsSep 1-7: 2.6% of 4366 checklistsSep 8-14: 2.4% of 4648 checklistsSep 15-21: 1.4% of 4369 checklistsSep 22-30: 0.6% of 6418 checklistsOct 1-7: 0.1% of 5375 checklistsOct 8-14: 0.1% of 6213 checklistsOct 15-21: 0% of 5553 checklistsOct 22-31: 0% of 8879 checklistsNov 1-7: 0% of 6231 checklistsNov 8-14: 0% of 5011 checklistsNov 15-21: 0% of 4856 checklistsNov 22-30: 0% of 6696 checklistsDec 1-7: 0% of 4530 checklistsDec 8-14: 0% of 4883 checklistsDec 15-21: 0% of 5833 checklistsDec 22-31: 0% of 9940 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 Louisiana 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 Louisiana

Best counties

Share of checklists at the peak
  1. Iberia ParishBest the second week of September · 14 checklists that week, 1,313 in all25%
  2. West Baton Rouge ParishBest mid August · 11 checklists that week, 519 in all25%
  3. Bossier ParishBest late August · 78 checklists that week, 3,463 in all15%
  4. St. Mary ParishBest early September · 24 checklists that week, 2,241 in all15%
  5. Pointe Coupee ParishBest late August · 13 checklists that week, 593 in all9.4%
  6. West Feliciana ParishBest late August · 53 checklists that week, 2,336 in all8.9%

Best spots

Share of checklists at the peak
  1. Red River National Wildlife RefugeBossier Parish, best late August · 35 checklists that week, 1,681 in all23%
  2. US 90/190 Rest Area St. TammanySt. Tammany Parish, best late August · 24 checklists that week, 794 in all22%
  3. Riverbend ParkEast Baton Rouge Parish, best the second week of September · 22 checklists that week, 303 in all14%
  4. C. Bickham Dickson Park - in Bossier Ph.Caddo Parish, best the second week of September · 20 checklists that week, 581 in all7.1%

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

Best time of day

In Louisiana, the Alder Flycatcher is most often listed on checklists started between 6 and 8 am (0.4% of those checklists).

0%0.5%12 am: too few checklists (110) to judge1 am: too few checklists (95) to judge2 am: too few checklists (78) to judge3 am: too few checklists (145) to judge4 am: too few checklists (266) to judge5 am: too few checklists (2981) to judge6 am: 0.4% of 21115 checklists7 am: 0.3% of 38843 checklists8 am: 0.2% of 36306 checklists9 am: 0.2% of 31934 checklists10 am: 0.2% of 27208 checklists11 am: 0.1% of 20733 checklists12 pm: 0.1% of 18505 checklists1 pm: 0.1% of 17383 checklists2 pm: 0.1% of 17422 checklists3 pm: 0.1% of 17005 checklists4 pm: 0.1% of 17170 checklists5 pm: 0.1% of 12536 checklists6 pm: 0.1% of 8080 checklists7 pm: too few checklists (3798) to judge8 pm: too few checklists (676) to judge9 pm: too few checklists (311) to judge10 pm: too few checklists (206) to judge11 pm: too few checklists (93) 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%0%
May0.1%0.2%0.2%0.1%
June0%0%0%0%
July0%0%0%0%
August0.1%0.3%1.4%1.6%
September2.6%2.4%1.4%0.6%
October0.1%0.1%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Texas: arrives the second week of August, 1 week earlier than Louisiana
  • Arkansas: arrives the second week of May, 13 weeks earlier than Louisiana
  • Oklahoma: arrives the second week of May, 13 weeks earlier than Louisiana
  • Missouri: arrives the second week of May, 13 weeks earlier than Louisiana

Common questions

When do Alder Flycatchers arrive in Louisiana?
Alder Flycatchers mostly pass through Louisiana: they arrive in mid August, peak in early September (2.2% of checklists), and most are gone by mid September.
When do Alder Flycatchers leave Louisiana?
Most Alder Flycatchers have left Louisiana by mid September, when reports fall below half their usual rate.
When is the best time to see a Alder Flycatcher in Louisiana?
The Alder Flycatcher is reported most often in early September, on about 2.2% of Louisiana checklists.
Where in Louisiana are Alder Flycatchers seen most often?
By county, Iberia Parish, West Baton Rouge Parish, and Bossier Parish have the highest peak reporting rates for the Alder Flycatcher (counties with at least 200 checklists).