WhenToBird

Mareca americana · Anatidae

When Do American Wigeons Arrive in Idaho?

Adult American Wigeon
Photo: Frank Schulenburg, CC BY-SA 4.0 via iNaturalist

American Wigeons are winter birds in Idaho: the first arrive in early August, they are common by the second week of September, peak in late March (15% of checklists), and most are gone by early May.

When to look

First arrivalsAug 1-7early August
Common bySep 8-14the second week of September
PeakMar 22-31late March
Most gone byMay 1-7early May

Best: late March. First arrivals early August; most are gone by early May. Peak: on about 15% of Idaho checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Mayuncommon
  6. Jununcommon
  7. Julrare
  8. Auguncommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%5%10%15%20%Jan 1-7: 11% of 9357 checklistsJan 8-14: 9.2% of 6408 checklistsJan 15-21: 9.7% of 6358 checklistsJan 22-31: 9.6% of 8601 checklistsFeb 1-7: 8.0% of 5611 checklistsFeb 8-14: 8.4% of 6090 checklistsFeb 15-21: 8.9% of 7973 checklistsFeb 22-28: 11% of 5866 checklistsMar 1-7: 12% of 6144 checklistsMar 8-14: 13% of 6456 checklistsMar 15-21: 14% of 6786 checklistsMar 22-31: 16% of 9539 checklistsApr 1-7: 14% of 7202 checklistsApr 8-14: 13% of 7608 checklistsApr 15-21: 11% of 8069 checklistsApr 22-30: 8.1% of 10973 checklistsMay 1-7: 4.3% of 9481 checklistsMay 8-14: 3.8% of 11318 checklistsMay 15-21: 2.9% of 9141 checklistsMay 22-31: 2.5% of 13984 checklistsJun 1-7: 2.7% of 8897 checklistsJun 8-14: 2.0% of 8504 checklistsJun 15-21: 2.2% of 8078 checklistsJun 22-30: 1.5% of 9665 checklistsJul 1-7: 1.3% of 7144 checklistsJul 8-14: 1.1% of 6557 checklistsJul 15-21: 0.7% of 6430 checklistsJul 22-31: 0.9% of 8696 checklistsAug 1-7: 0.9% of 5896 checklistsAug 8-14: 1.5% of 5643 checklistsAug 15-21: 2.3% of 6151 checklistsAug 22-31: 2.9% of 7863 checklistsSep 1-7: 4.8% of 5769 checklistsSep 8-14: 4.9% of 5646 checklistsSep 15-21: 5.8% of 5460 checklistsSep 22-30: 6.9% of 6363 checklistsOct 1-7: 8.4% of 4980 checklistsOct 8-14: 11% of 5096 checklistsOct 15-21: 11% of 4878 checklistsOct 22-31: 14% of 6426 checklistsNov 1-7: 15% of 4822 checklistsNov 8-14: 13% of 4999 checklistsNov 15-21: 12% of 4601 checklistsNov 22-30: 13% of 6027 checklistsDec 1-7: 10% of 4180 checklistsDec 8-14: 9.9% of 4775 checklistsDec 15-21: 9.9% of 6522 checklistsDec 22-31: 9.7% of 7792 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 Idaho 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 Idaho

Best counties

Share of checklists at the peak
  1. Lewis CountyBest late October · 12 checklists that week, 603 in all44%
  2. Jefferson CountyBest late March · 203 checklists that week, 5,319 in all43%
  3. Benewah CountyBest late October · 37 checklists that week, 2,541 in all41%
  4. Gooding CountyBest late November · 53 checklists that week, 3,207 in all41%
  5. Jerome CountyBest late March · 17 checklists that week, 804 in all40%
  6. Franklin CountyBest early April · 20 checklists that week, 651 in all37%

Best spots

Share of checklists at the peak
  1. Julius Kleiner Memorial ParkAda County, best early November · 33 checklists that week, 321 in all100%
  2. Ann Morrison Memorial ParkAda County, best mid January · 25 checklists that week, 210 in all96%
  3. Clear LakeGooding County, best early January · 41 checklists that week, 174 in all94%
  4. Julia Davis ParkAda County, best the second week of January · 28 checklists that week, 310 in all92%
  5. Barber PoolAda County, best the second week of October · 24 checklists that week, 1,099 in all89%
  6. Clearwater RiverNez Perce County, best mid February · 26 checklists that week, 513 in all88%

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

Best time of day

In Idaho, the American Wigeon is most often listed on checklists started between 2 and 4 pm (9.6% of those checklists).

0%5%10%12 am: too few checklists (180) to judge1 am: too few checklists (176) to judge2 am: too few checklists (169) to judge3 am: too few checklists (164) to judge4 am: too few checklists (450) to judge5 am: too few checklists (2270) to judge6 am: 2.8% of 9122 checklists7 am: 5.5% of 22204 checklists8 am: 6.3% of 38672 checklists9 am: 7.3% of 38930 checklists10 am: 7.6% of 37338 checklists11 am: 7.9% of 33508 checklists12 pm: 8.5% of 28544 checklists1 pm: 9.4% of 25774 checklists2 pm: 9.7% of 24296 checklists3 pm: 9.4% of 21784 checklists4 pm: 7.5% of 19051 checklists5 pm: 6.4% of 14150 checklists6 pm: 4.9% of 10014 checklists7 pm: 2.9% of 7495 checklists8 pm: too few checklists (4352) to judge9 pm: too few checklists (1449) to judge10 pm: too few checklists (525) to judge11 pm: too few checklists (208) 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
January11%9.2%9.7%9.6%
February8.0%8.4%8.9%11%
March12%13%14%16%
April14%13%11%8.1%
May4.3%3.8%2.9%2.5%
June2.7%2.0%2.2%1.5%
July1.3%1.1%0.7%0.9%
August0.9%1.5%2.3%2.9%
September4.8%4.9%5.8%6.9%
October8.4%11%11%14%
November15%13%12%13%
December10%9.9%9.9%9.7%

Neighboring states

  • Montana: arrives mid March, 18 weeks earlier than Idaho
  • Utah: arrives early September, 4 weeks later than Idaho
  • Oregon: arrives late August, 3 weeks later than Idaho
  • Washington: arrives mid August, 2 weeks later than Idaho

Common questions

When do American Wigeons arrive in Idaho?
American Wigeons are winter birds in Idaho: the first arrive in early August, they are common by the second week of September, peak in late March (15% of checklists), and most are gone by early May.
When do American Wigeons leave Idaho?
Most American Wigeons have left Idaho by early May, when reports fall below half their usual rate. Stragglers are still reported until the second week of July.
When is the best time to see a American Wigeon in Idaho?
The American Wigeon is reported most often in late March, on about 15% of Idaho checklists.
Where in Idaho are American Wigeons seen most often?
By county, Lewis County, Jefferson County, and Benewah County have the highest peak reporting rates for the American Wigeon (counties with at least 200 checklists).