WhenToBird

Mareca strepera · Anatidae

When Do Gadwalls Arrive in Idaho?

Adult Gadwall
Photo: Anne Parsons, CC0 1.0 via iNaturalist

The Gadwall is in Idaho all year. It turns up on about 13% of checklists at its peak (mid April) and on 3.0% in its quietest week (late July).

When to look

PresentAll year
Peak weekApr 15-21mid April
Quietest weekJul 22-31late July

Best: mid April. Here all year. Peak: on about 13% of Idaho checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Juluncommon
  8. Auguncommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%5%10%15%Jan 1-7: 9.1% of 9357 checklistsJan 8-14: 8.9% of 6408 checklistsJan 15-21: 8.3% of 6358 checklistsJan 22-31: 8.9% of 8601 checklistsFeb 1-7: 8.0% of 5611 checklistsFeb 8-14: 8.5% of 6090 checklistsFeb 15-21: 7.4% of 7973 checklistsFeb 22-28: 9.3% of 5866 checklistsMar 1-7: 8.9% of 6144 checklistsMar 8-14: 8.7% of 6456 checklistsMar 15-21: 9.0% of 6786 checklistsMar 22-31: 11% of 9539 checklistsApr 1-7: 11% of 7202 checklistsApr 8-14: 12% of 7608 checklistsApr 15-21: 13% of 8069 checklistsApr 22-30: 13% of 10973 checklistsMay 1-7: 11% of 9481 checklistsMay 8-14: 9.9% of 11318 checklistsMay 15-21: 9.0% of 9141 checklistsMay 22-31: 8.1% of 13984 checklistsJun 1-7: 7.0% of 8897 checklistsJun 8-14: 6.1% of 8504 checklistsJun 15-21: 5.9% of 8078 checklistsJun 22-30: 4.2% of 9665 checklistsJul 1-7: 3.3% of 7144 checklistsJul 8-14: 3.4% of 6557 checklistsJul 15-21: 3.1% of 6430 checklistsJul 22-31: 2.9% of 8696 checklistsAug 1-7: 2.9% of 5896 checklistsAug 8-14: 3.3% of 5643 checklistsAug 15-21: 3.5% of 6151 checklistsAug 22-31: 3.8% of 7863 checklistsSep 1-7: 4.9% of 5769 checklistsSep 8-14: 4.6% of 5646 checklistsSep 15-21: 4.9% of 5460 checklistsSep 22-30: 6.0% of 6363 checklistsOct 1-7: 6.9% of 4980 checklistsOct 8-14: 8.3% of 5096 checklistsOct 15-21: 8.7% of 4878 checklistsOct 22-31: 11% of 6426 checklistsNov 1-7: 11% of 4822 checklistsNov 8-14: 11% of 4999 checklistsNov 15-21: 11% of 4601 checklistsNov 22-30: 11% of 6027 checklistsDec 1-7: 8.7% of 4180 checklistsDec 8-14: 8.3% of 4775 checklistsDec 15-21: 8.1% of 6522 checklistsDec 22-31: 7.9% 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. Gooding CountyBest early December · 34 checklists that week, 3,207 in all48%
  2. Jefferson CountyBest late May · 542 checklists that week, 5,319 in all42%
  3. Bingham CountyBest late January · 11 checklists that week, 1,427 in all41%
  4. Jerome CountyBest late December · 12 checklists that week, 804 in all33%
  5. Franklin CountyBest early April · 20 checklists that week, 651 in all31%
  6. Camas CountyBest mid June · 71 checklists that week, 2,112 in all29%

Best spots

Share of checklists at the peak
  1. Hyatt Hidden Lakes ReserveAda County, best early October · 47 checklists that week, 2,507 in all97%
  2. Barber PoolAda County, best late November · 31 checklists that week, 1,099 in all90%
  3. Kathryn Albertson ParkAda County, best mid October · 63 checklists that week, 3,927 in all88%

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

Best time of day

In Idaho, the Gadwall is most often listed on checklists started between 2 and 4 pm (9.7% 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: 4.6% of 9122 checklists7 am: 6.4% of 22204 checklists8 am: 6.8% of 38672 checklists9 am: 8.1% of 38930 checklists10 am: 8.2% of 37338 checklists11 am: 8.3% of 33508 checklists12 pm: 8.6% of 28544 checklists1 pm: 9.4% of 25774 checklists2 pm: 9.6% of 24296 checklists3 pm: 9.7% of 21784 checklists4 pm: 8.5% of 19051 checklists5 pm: 7.6% of 14150 checklists6 pm: 6.9% of 10014 checklists7 pm: 5.7% 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
January9.1%8.9%8.3%8.9%
February8.0%8.5%7.4%9.3%
March8.9%8.7%9.0%11%
April11%12%13%13%
May11%9.9%9.0%8.1%
June7.0%6.1%5.9%4.2%
July3.3%3.4%3.1%2.9%
August2.9%3.3%3.5%3.8%
September4.9%4.6%4.9%6.0%
October6.9%8.3%8.7%11%
November11%11%11%11%
December8.7%8.3%8.1%7.9%

Neighboring states

  • Montana: summer visitor, peaks late April
  • Utah: summer visitor, peaks early April
  • Oregon: all year, most in spring, peaks the second week of May
  • Washington: year-round, peaks late April

Common questions

When do Gadwalls arrive in Idaho?
The Gadwall is in Idaho all year. It turns up on about 13% of checklists at its peak (mid April) and on 3.0% in its quietest week (late July).
When do Gadwalls leave Idaho?
The Gadwall does not leave Idaho: it is reported all year, from 3.0% of checklists in late July to 13% in mid April.
When is the best time to see a Gadwall in Idaho?
The Gadwall is reported most often in mid April, on about 13% of Idaho checklists.
Where in Idaho are Gadwalls seen most often?
By county, Gooding County, Jefferson County, and Bingham County have the highest peak reporting rates for the Gadwall (counties with at least 200 checklists).