WhenToBird

Melanitta deglandi · Anatidae

When Do White-winged Scoters Arrive in Wyoming?

Adult White-winged Scoter
Photo: sprcrkwild, CC BY 4.0 via iNaturalist

White-winged Scoters mostly pass through Wyoming: they arrive in late October, peak in the second week of November (2.2% of checklists), and most are gone by late November.

When to look

First arrivalsOct 22-31late October
Common byOct 22-31late October
PeakNov 8-14the second week of November
Most gone byNov 22-30late November

Best: the second week of November. First arrivals late October; most are gone by late November. Peak: on about 2.2% of Wyoming checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprnot usually seen
  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. Decuncommon

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

0%1%2%3%Jan 1-7: 0% of 2543 checklistsJan 8-14: 0% of 2114 checklistsJan 15-21: 0% of 1984 checklistsJan 22-31: 0% of 2605 checklistsFeb 1-7: 0% of 1940 checklistsFeb 8-14: 0% of 1954 checklistsFeb 15-21: 0% of 2575 checklistsFeb 22-28: 0% of 1932 checklistsMar 1-7: 0% of 2486 checklistsMar 8-14: 0% of 2535 checklistsMar 15-21: 0% of 2726 checklistsMar 22-31: 0% of 4349 checklistsApr 1-7: 0% of 3300 checklistsApr 8-14: 0% of 3500 checklistsApr 15-21: 0.1% of 3701 checklistsApr 22-30: 0.1% of 5887 checklistsMay 1-7: 0% of 5341 checklistsMay 8-14: 0% of 6910 checklistsMay 15-21: 0.1% of 6884 checklistsMay 22-31: 0% of 10652 checklistsJun 1-7: 0% of 6807 checklistsJun 8-14: 0% of 6714 checklistsJun 15-21: 0% of 6708 checklistsJun 22-30: 0% of 8160 checklistsJul 1-7: 0% of 5755 checklistsJul 8-14: 0% of 5379 checklistsJul 15-21: 0% of 5299 checklistsJul 22-31: 0% of 6830 checklistsAug 1-7: 0% of 4581 checklistsAug 8-14: 0% of 4625 checklistsAug 15-21: 0% of 4466 checklistsAug 22-31: 0% of 6562 checklistsSep 1-7: 0% of 4543 checklistsSep 8-14: 0% of 4652 checklistsSep 15-21: 0% of 4186 checklistsSep 22-30: 0% of 5301 checklistsOct 1-7: 0% of 3248 checklistsOct 8-14: 0.1% of 3010 checklistsOct 15-21: 0.3% of 2624 checklistsOct 22-31: 0.3% of 3170 checklistsNov 1-7: 2.3% of 2110 checklistsNov 8-14: 2.4% of 2153 checklistsNov 15-21: 2.0% of 1971 checklistsNov 22-30: 1.1% of 2136 checklistsDec 1-7: 0.4% of 1646 checklistsDec 8-14: 0% of 1609 checklistsDec 15-21: 0% of 1954 checklistsDec 22-31: 0% of 2392 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 Wyoming 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.

Embed this map on your site

Where in Wyoming

Best counties

Share of checklists at the peak
  1. Carbon CountyBest the second week of November · 42 checklists that week, 6,429 in all17%
  2. Natrona CountyBest mid November · 53 checklists that week, 5,810 in all6.6%
  3. Albany CountyBest the second week of November · 425 checklists that week, 21,857 in all5.6%
  4. Johnson CountyBest the second week of November · 104 checklists that week, 5,977 in all5.4%
  5. Fremont CountyBest the second week of November · 419 checklists that week, 27,707 in all1.8%

Best spots

Share of checklists at the peak
  1. Lake Hattie ReservoirAlbany County, best late November · 23 checklists that week, 476 in all38%
  2. Twin Buttes LakeAlbany County, best early November · 41 checklists that week, 405 in all32%
  3. Healy ReservoirJohnson County, best the second week of November · 24 checklists that week, 406 in all22%
  4. Dry LakeFremont County, best the second week of November · 22 checklists that week, 276 in all10%
  5. Hutton Lake National Wildlife RefugeAlbany County, best mid May · 26 checklists that week, 936 in all0.9%

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

Best time of day

In Wyoming, the White-winged Scoter is most often listed on checklists started between 1 and 3 pm (0.2% of those checklists).

0%0.5%12 am: too few checklists (59) to judge1 am: too few checklists (76) to judge2 am: too few checklists (86) to judge3 am: too few checklists (79) to judge4 am: too few checklists (326) to judge5 am: too few checklists (2271) to judge6 am: 0.1% of 8808 checklists7 am: 0.1% of 18458 checklists8 am: 0.1% of 22143 checklists9 am: 0.1% of 21499 checklists10 am: 0.1% of 19425 checklists11 am: 0.1% of 16017 checklists12 pm: 0.2% of 13868 checklists1 pm: 0.1% of 12984 checklists2 pm: 0.2% of 12605 checklists3 pm: 0.1% of 11821 checklists4 pm: 0.1% of 10571 checklists5 pm: 0.1% of 8746 checklists6 pm: 0.1% of 6707 checklists7 pm: 0% of 4890 checklists8 pm: too few checklists (2323) to judge9 pm: too few checklists (554) to judge10 pm: too few checklists (134) to judge11 pm: too few checklists (59) 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
January0%0%0%0%
February0%0%0%0%
March0%0%0%0%
April0%0%0.1%0.1%
May0%0%0.1%0%
June0%0%0%0%
July0%0%0%0%
August0%0%0%0%
September0%0%0%0%
October0%0.1%0.3%0.3%
November2.3%2.4%2.0%1.1%
December0.4%0%0%0%

Neighboring states

  • Montana: arrives mid October, 1 week earlier than Wyoming
  • South Dakota: arrives early November, 1 week later than Wyoming
  • North Dakota: arrives mid October, 1 week earlier than Wyoming
  • Nebraska: arrives late October, in the same week than Wyoming

Common questions

When do White-winged Scoters arrive in Wyoming?
White-winged Scoters mostly pass through Wyoming: they arrive in late October, peak in the second week of November (2.2% of checklists), and most are gone by late November.
When do White-winged Scoters leave Wyoming?
Most White-winged Scoters have left Wyoming by late November, when reports fall below half their usual rate.
When is the best time to see a White-winged Scoter in Wyoming?
The White-winged Scoter is reported most often in the second week of November, on about 2.2% of Wyoming checklists.
Where in Wyoming are White-winged Scoters seen most often?
By county, Carbon County, Natrona County, and Albany County have the highest peak reporting rates for the White-winged Scoter (counties with at least 200 checklists).