WhenToBird

Lophodytes cucullatus · Anatidae

When Do Hooded Mergansers Arrive in Arizona?

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

Hooded Mergansers are winter birds in Arizona: the first arrive in early November, they are common by the second week of November, peak in the second week of January (2.6% of checklists), and most are gone by early March.

When to look

First arrivalsNov 1-7early November
Common byNov 8-14the second week of November
PeakJan 8-14the second week of January
Most gone byMar 1-7early March

Best: the second week of January. First arrivals early November; most are gone by early March. Peak: on about 2.6% of Arizona checklists.

  1. Janpeak season
  2. Febcommon
  3. Marcommon
  4. Aprrare
  5. Maynot usually seen
  6. Junnot usually seen
  7. Julnot usually seen
  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%1%2%3%Jan 1-7: 2.8% of 34758 checklistsJan 8-14: 2.6% of 29835 checklistsJan 15-21: 2.5% of 29279 checklistsJan 22-31: 1.9% of 39716 checklistsFeb 1-7: 2.0% of 27299 checklistsFeb 8-14: 1.8% of 28703 checklistsFeb 15-21: 1.7% of 35357 checklistsFeb 22-28: 1.7% of 29889 checklistsMar 1-7: 1.3% of 29932 checklistsMar 8-14: 1.0% of 32982 checklistsMar 15-21: 0.7% of 34731 checklistsMar 22-31: 0.5% of 50213 checklistsApr 1-7: 0.2% of 35788 checklistsApr 8-14: 0.1% of 38087 checklistsApr 15-21: 0.1% of 41520 checklistsApr 22-30: 0.1% of 55218 checklistsMay 1-7: 0.1% of 39688 checklistsMay 8-14: 0.1% of 39398 checklistsMay 15-21: 0.1% of 29562 checklistsMay 22-31: 0.1% of 36774 checklistsJun 1-7: 0.1% of 21313 checklistsJun 8-14: 0.1% of 19129 checklistsJun 15-21: 0.1% of 17922 checklistsJun 22-30: 0.1% of 21188 checklistsJul 1-7: 0.1% of 17325 checklistsJul 8-14: 0.1% of 16463 checklistsJul 15-21: 0.1% of 18642 checklistsJul 22-31: 0.1% of 31215 checklistsAug 1-7: 0.1% of 28163 checklistsAug 8-14: 0.1% of 31329 checklistsAug 15-21: 0.1% of 23878 checklistsAug 22-31: 0.1% of 28508 checklistsSep 1-7: 0.1% of 20878 checklistsSep 8-14: 0.1% of 19671 checklistsSep 15-21: 0.1% of 19859 checklistsSep 22-30: 0.1% of 25179 checklistsOct 1-7: 0.1% of 19420 checklistsOct 8-14: 0.1% of 21925 checklistsOct 15-21: 0.1% of 20995 checklistsOct 22-31: 0.4% of 29258 checklistsNov 1-7: 1.2% of 21269 checklistsNov 8-14: 1.7% of 22753 checklistsNov 15-21: 2.3% of 21982 checklistsNov 22-30: 2.6% of 29475 checklistsDec 1-7: 2.4% of 20810 checklistsDec 8-14: 2.3% of 22229 checklistsDec 15-21: 2.3% of 25148 checklistsDec 22-31: 2.2% of 39567 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 Arizona 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 Arizona

Best counties

Share of checklists at the peak
  1. Yavapai CountyBest the second week of January · 1829 checklists that week, 83,606 in all7.7%
  2. Apache CountyBest late November · 91 checklists that week, 12,931 in all6.0%
  3. Mohave CountyBest late January · 573 checklists that week, 18,083 in all5.6%
  4. Navajo CountyBest the second week of January · 288 checklists that week, 18,838 in all5.3%
  5. Yuma CountyBest late December · 499 checklists that week, 14,687 in all5.2%
  6. La Paz CountyBest the second week of January · 302 checklists that week, 7,279 in all4.9%

Best spots

Share of checklists at the peak
  1. Fountain LakeMaricopa County, best early December · 37 checklists that week, 1,477 in all92%
  2. Upper Goldwater LakeYavapai County, best late December · 20 checklists that week, 690 in all76%
  3. Parker Canyon LakeCochise County, best the second week of January · 24 checklists that week, 760 in all58%
  4. Watson Woods ParkYavapai County, best late November · 95 checklists that week, 3,753 in all58%

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

Best time of day

In Arizona, the Hooded Merganser is most often listed on checklists started between 1 and 3 pm (1.1% of those checklists).

0%0.5%1%1.5%12 am: too few checklists (488) to judge1 am: too few checklists (503) to judge2 am: too few checklists (489) to judge3 am: too few checklists (735) to judge4 am: too few checklists (4115) to judge5 am: 0.1% of 38350 checklists6 am: 0.2% of 118786 checklists7 am: 0.7% of 183415 checklists8 am: 1.0% of 187346 checklists9 am: 1.1% of 151342 checklists10 am: 1.0% of 124522 checklists11 am: 1.0% of 97088 checklists12 pm: 0.9% of 78110 checklists1 pm: 1.1% of 73059 checklists2 pm: 1.1% of 68912 checklists3 pm: 1.1% of 68060 checklists4 pm: 0.9% of 69387 checklists5 pm: 0.5% of 52951 checklists6 pm: 0.1% of 31061 checklists7 pm: too few checklists (16076) to judge8 pm: too few checklists (5352) to judge9 pm: too few checklists (2369) to judge10 pm: too few checklists (1100) to judge11 pm: too few checklists (604) 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
January2.8%2.6%2.5%1.9%
February2.0%1.8%1.7%1.7%
March1.3%1.0%0.7%0.5%
April0.2%0.1%0.1%0.1%
May0.1%0.1%0.1%0.1%
June0.1%0.1%0.1%0.1%
July0.1%0.1%0.1%0.1%
August0.1%0.1%0.1%0.1%
September0.1%0.1%0.1%0.1%
October0.1%0.1%0.1%0.4%
November1.2%1.7%2.3%2.6%
December2.4%2.3%2.3%2.2%

Neighboring states

  • New Mexico: arrives late October, 1 week earlier than Arizona
  • Nevada: arrives late October, 1 week earlier than Arizona
  • Utah: arrives late October, 1 week earlier than Arizona
  • California: arrives early November, in the same week than Arizona

Common questions

When do Hooded Mergansers arrive in Arizona?
Hooded Mergansers are winter birds in Arizona: the first arrive in early November, they are common by the second week of November, peak in the second week of January (2.6% of checklists), and most are gone by early March.
When do Hooded Mergansers leave Arizona?
Most Hooded Mergansers have left Arizona by early March, when reports fall below half their usual rate.
When is the best time to see a Hooded Merganser in Arizona?
The Hooded Merganser is reported most often in the second week of January, on about 2.6% of Arizona checklists.
Where in Arizona are Hooded Mergansers seen most often?
By county, Yavapai County, Apache County, and Mohave County have the highest peak reporting rates for the Hooded Merganser (counties with at least 200 checklists).