WhenToBird

Lophodytes cucullatus · Anatidae

When Do Hooded Mergansers Arrive in Indiana?

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

Hooded Mergansers are winter birds in Indiana: the first arrive in late October, they are common by early November, peak in early December (8.9% of checklists), and most are gone by late March.

When to look

First arrivalsOct 22-31late October
Common byNov 1-7early November
PeakDec 1-7early December
Most gone byMar 22-31late March

Best: early December. First arrivals late October; most are gone by late March. Peak: on about 8.9% of Indiana checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Apruncommon
  5. Mayrare
  6. Junrare
  7. Julrare
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novpeak season
  12. Decpeak season

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

0%5%10%Jan 1-7: 7.7% of 18123 checklistsJan 8-14: 8.4% of 12006 checklistsJan 15-21: 8.5% of 12403 checklistsJan 22-31: 8.1% of 16181 checklistsFeb 1-7: 7.2% of 12546 checklistsFeb 8-14: 6.6% of 14250 checklistsFeb 15-21: 5.3% of 18077 checklistsFeb 22-28: 8.2% of 13590 checklistsMar 1-7: 8.8% of 14545 checklistsMar 8-14: 7.8% of 14594 checklistsMar 15-21: 6.1% of 13894 checklistsMar 22-31: 4.6% of 22400 checklistsApr 1-7: 3.4% of 18069 checklistsApr 8-14: 2.0% of 19579 checklistsApr 15-21: 1.6% of 19518 checklistsApr 22-30: 0.9% of 30544 checklistsMay 1-7: 0.7% of 28430 checklistsMay 8-14: 0.7% of 30624 checklistsMay 15-21: 0.7% of 22920 checklistsMay 22-31: 0.9% of 21234 checklistsJun 1-7: 0.8% of 12279 checklistsJun 8-14: 0.7% of 10904 checklistsJun 15-21: 0.5% of 9488 checklistsJun 22-30: 0.6% of 11362 checklistsJul 1-7: 0.5% of 9947 checklistsJul 8-14: 0.5% of 9585 checklistsJul 15-21: 0.4% of 8929 checklistsJul 22-31: 0.3% of 12639 checklistsAug 1-7: 0.3% of 9528 checklistsAug 8-14: 0.2% of 9451 checklistsAug 15-21: 0.2% of 9442 checklistsAug 22-31: 0.2% of 14969 checklistsSep 1-7: 0.1% of 12628 checklistsSep 8-14: 0.1% of 11793 checklistsSep 15-21: 0.2% of 11396 checklistsSep 22-30: 0.1% of 14203 checklistsOct 1-7: 0.2% of 11365 checklistsOct 8-14: 0.2% of 12092 checklistsOct 15-21: 0.5% of 10440 checklistsOct 22-31: 1.9% of 13883 checklistsNov 1-7: 4.4% of 10476 checklistsNov 8-14: 6.7% of 9776 checklistsNov 15-21: 9.0% of 9035 checklistsNov 22-30: 8.5% of 12547 checklistsDec 1-7: 9.1% of 9078 checklistsDec 8-14: 9.4% of 8732 checklistsDec 15-21: 8.4% of 11024 checklistsDec 22-31: 7.6% of 15432 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 Indiana 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 Indiana

Best counties

Share of checklists at the peak
  1. Gibson CountyBest mid November · 107 checklists that week, 10,754 in all47%
  2. Brown CountyBest early February · 52 checklists that week, 5,917 in all37%
  3. Henry CountyBest the second week of December · 46 checklists that week, 4,207 in all34%
  4. Dubois CountyBest the second week of December · 21 checklists that week, 1,896 in all29%
  5. Sullivan CountyBest mid January · 101 checklists that week, 4,018 in all27%
  6. Union CountyBest mid November · 82 checklists that week, 4,811 in all27%

Best spots

Share of checklists at the peak
  1. RoxanaLake County, best early January · 34 checklists that week, 279 in all93%
  2. Middle Fork ReservoirWayne County, best mid January · 25 checklists that week, 822 in all93%
  3. Saint Marys LakeSt. Joseph County, best late November · 40 checklists that week, 1,410 in all92%
  4. Saint Josephs LakeSt. Joseph County, best early January · 20 checklists that week, 1,064 in all90%
  5. Greene-Sullivan State ForestSullivan County, best late January · 27 checklists that week, 272 in all83%
  6. Atlantis Water ParkClark County, best mid November · 26 checklists that week, 182 in all82%

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

Best time of day

In Indiana, the Hooded Merganser is most often listed on checklists started between 3 and 5 pm (4.4% of those checklists).

0%2%4%6%12 am: too few checklists (240) to judge1 am: too few checklists (231) to judge2 am: too few checklists (222) to judge3 am: too few checklists (202) to judge4 am: too few checklists (674) to judge5 am: too few checklists (4329) to judge6 am: 2.9% of 20589 checklists7 am: 2.4% of 58470 checklists8 am: 2.9% of 86931 checklists9 am: 3.3% of 78239 checklists10 am: 3.6% of 66080 checklists11 am: 3.9% of 54904 checklists12 pm: 3.8% of 47610 checklists1 pm: 4.0% of 44814 checklists2 pm: 4.3% of 43790 checklists3 pm: 4.4% of 42983 checklists4 pm: 4.4% of 45349 checklists5 pm: 3.0% of 35993 checklists6 pm: 1.6% of 26447 checklists7 pm: 0.9% of 17740 checklists8 pm: too few checklists (7603) to judge9 pm: too few checklists (1721) to judge10 pm: too few checklists (517) to judge11 pm: too few checklists (272) 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
January7.7%8.4%8.5%8.1%
February7.2%6.6%5.3%8.2%
March8.8%7.8%6.1%4.6%
April3.4%2.0%1.6%0.9%
May0.7%0.7%0.7%0.9%
June0.8%0.7%0.5%0.6%
July0.5%0.5%0.4%0.3%
August0.3%0.2%0.2%0.2%
September0.1%0.1%0.2%0.1%
October0.2%0.2%0.5%1.9%
November4.4%6.7%9.0%8.5%
December9.1%9.4%8.4%7.6%

Neighboring states

  • Illinois: arrives mid October, 1 week earlier than Indiana
  • Kentucky: arrives early November, 1 week later than Indiana
  • Ohio: arrives mid October, 1 week earlier than Indiana
  • Michigan: arrives mid July, 13 weeks earlier than Indiana

Common questions

When do Hooded Mergansers arrive in Indiana?
Hooded Mergansers are winter birds in Indiana: the first arrive in late October, they are common by early November, peak in early December (8.9% of checklists), and most are gone by late March.
When do Hooded Mergansers leave Indiana?
Most Hooded Mergansers have left Indiana by late March, when reports fall below half their usual rate. Stragglers are still reported until late April.
When is the best time to see a Hooded Merganser in Indiana?
The Hooded Merganser is reported most often in early December, on about 8.9% of Indiana checklists.
Where in Indiana are Hooded Mergansers seen most often?
By county, Gibson County, Brown County, and Henry County have the highest peak reporting rates for the Hooded Merganser (counties with at least 200 checklists).