WhenToBird

Lophodytes cucullatus · Anatidae

When Do Hooded Mergansers Arrive in Louisiana?

Adult male Hooded Merganser
Photo: Justin Flint, CC BY 4.0 via iNaturalist

Hooded Mergansers are winter birds in Louisiana: they arrive in the second week of November, peak in early December (3.4% of checklists), and most are gone by the second week of February.

When to look

First arrivalsNov 8-14the second week of November
Common byNov 8-14the second week of November
PeakDec 1-7early December
Most gone byFeb 8-14the second week of February

Best: early December. First arrivals the second week of November; most are gone by the second week of February. Peak: on about 3.4% of Louisiana checklists.

  1. Janpeak season
  2. Febcommon
  3. Maruncommon
  4. Aprrare
  5. Mayrare
  6. Junrare
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octrare
  11. Novpeak season
  12. Decpeak season

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

0%1%2%3%4%Jan 1-7: 3.6% of 8384 checklistsJan 8-14: 2.8% of 6265 checklistsJan 15-21: 3.4% of 6825 checklistsJan 22-31: 2.6% of 8776 checklistsFeb 1-7: 2.1% of 5956 checklistsFeb 8-14: 1.8% of 6291 checklistsFeb 15-21: 1.2% of 8044 checklistsFeb 22-28: 1.3% of 5946 checklistsMar 1-7: 1.2% of 5981 checklistsMar 8-14: 0.8% of 6307 checklistsMar 15-21: 0.8% of 6747 checklistsMar 22-31: 0.4% of 10487 checklistsApr 1-7: 0.2% of 8037 checklistsApr 8-14: 0.3% of 9577 checklistsApr 15-21: 0.2% of 11372 checklistsApr 22-30: 0.3% of 14344 checklistsMay 1-7: 0.3% of 8193 checklistsMay 8-14: 0.2% of 6823 checklistsMay 15-21: 0.2% of 4818 checklistsMay 22-31: 0.2% of 6206 checklistsJun 1-7: 0.2% of 3660 checklistsJun 8-14: 0.1% of 3455 checklistsJun 15-21: 0.1% of 3084 checklistsJun 22-30: 0.1% of 3904 checklistsJul 1-7: 0.1% of 3240 checklistsJul 8-14: 0.1% of 3235 checklistsJul 15-21: 0.1% of 3167 checklistsJul 22-31: 0.1% of 4328 checklistsAug 1-7: 0% of 3192 checklistsAug 8-14: 0% of 3394 checklistsAug 15-21: 0.1% of 3502 checklistsAug 22-31: 0% of 5658 checklistsSep 1-7: 0.1% of 4366 checklistsSep 8-14: 0.1% of 4648 checklistsSep 15-21: 0.1% of 4369 checklistsSep 22-30: 0.1% of 6418 checklistsOct 1-7: 0.1% of 5375 checklistsOct 8-14: 0.1% of 6213 checklistsOct 15-21: 0.1% of 5553 checklistsOct 22-31: 0.1% of 8879 checklistsNov 1-7: 0.9% of 6231 checklistsNov 8-14: 2.5% of 5011 checklistsNov 15-21: 2.9% of 4856 checklistsNov 22-30: 3.4% of 6696 checklistsDec 1-7: 3.8% of 4530 checklistsDec 8-14: 3.1% of 4883 checklistsDec 15-21: 3.1% of 5833 checklistsDec 22-31: 3.2% 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. Concordia ParishBest early December · 13 checklists that week, 983 in all29%
  2. Franklin ParishBest the second week of January · 12 checklists that week, 416 in all29%
  3. Claiborne ParishBest early February · 16 checklists that week, 1,949 in all21%
  4. Red River ParishBest the second week of March · 21 checklists that week, 998 in all21%
  5. Avoyelles ParishBest late December · 35 checklists that week, 432 in all20%
  6. Washington ParishBest late January · 38 checklists that week, 975 in all18%

Best spots

Share of checklists at the peak
  1. Capitol LakeEast Baton Rouge Parish, best early December · 74 checklists that week, 1,223 in all96%
  2. Red River National Wildlife Refuge (southeast)Red River Parish, best mid March · 24 checklists that week, 657 in all22%
  3. City-Brooks Community ParkEast Baton Rouge Parish, best late January · 46 checklists that week, 1,603 in all16%
  4. New Orleans City ParkOrleans Parish, best the second week of January · 46 checklists that week, 4,934 in all16%

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

Best time of day

In Louisiana, the Hooded Merganser is most often listed on checklists started between 2 and 4 pm (1.3% of those checklists).

0%0.5%1%1.5%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: 1.2% of 21115 checklists7 am: 1.1% of 38843 checklists8 am: 1.2% of 36306 checklists9 am: 1.2% of 31934 checklists10 am: 1.1% of 27208 checklists11 am: 1.2% of 20733 checklists12 pm: 1.1% of 18505 checklists1 pm: 1.2% of 17383 checklists2 pm: 1.4% of 17422 checklists3 pm: 1.2% of 17005 checklists4 pm: 1.1% of 17170 checklists5 pm: 0.4% 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
January3.6%2.8%3.4%2.6%
February2.1%1.8%1.2%1.3%
March1.2%0.8%0.8%0.4%
April0.2%0.3%0.2%0.3%
May0.3%0.2%0.2%0.2%
June0.2%0.1%0.1%0.1%
July0.1%0.1%0.1%0.1%
August0%0%0.1%0%
September0.1%0.1%0.1%0.1%
October0.1%0.1%0.1%0.1%
November0.9%2.5%2.9%3.4%
December3.8%3.1%3.1%3.2%

Neighboring states

  • Mississippi: arrives early November, 1 week earlier than Louisiana
  • Alabama: arrives early November, 1 week earlier than Louisiana
  • Texas: arrives the second week of November, in the same week than Louisiana
  • Arkansas: arrives early November, 1 week earlier than Louisiana

Common questions

When do Hooded Mergansers arrive in Louisiana?
Hooded Mergansers are winter birds in Louisiana: they arrive in the second week of November, peak in early December (3.4% of checklists), and most are gone by the second week of February.
When do Hooded Mergansers leave Louisiana?
Most Hooded Mergansers have left Louisiana by the second week of February, when reports fall below half their usual rate. Stragglers are still reported until early March.
When is the best time to see a Hooded Merganser in Louisiana?
The Hooded Merganser is reported most often in early December, on about 3.4% of Louisiana checklists.
Where in Louisiana are Hooded Mergansers seen most often?
By county, Concordia Parish, Franklin Parish, and Claiborne Parish have the highest peak reporting rates for the Hooded Merganser (counties with at least 200 checklists).