WhenToBird

Aythya marila · Anatidae

When Do Greater Scaups Arrive in Washington?

Adult Greater Scaup
Photo: Se Lena, CC BY 4.0 via iNaturalist

Greater Scaups are winter birds in Washington: the first arrive in late September, they are common by the second week of October, peak in mid January (4.7% of checklists), and most are gone by late April.

When to look

First arrivalsSep 22-30late September
Common byOct 8-14the second week of October
PeakJan 15-21mid January
Most gone byApr 22-30late April

Best: mid January. First arrivals late September; most are gone by late April. Peak: on about 4.7% of Washington checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprcommon
  5. Mayuncommon
  6. Junrare
  7. Julnot usually seen
  8. Augrare
  9. Sepuncommon
  10. Octcommon
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%Jan 1-7: 4.6% of 41928 checklistsJan 8-14: 4.6% of 31152 checklistsJan 15-21: 4.7% of 31753 checklistsJan 22-31: 4.8% of 42530 checklistsFeb 1-7: 4.3% of 29739 checklistsFeb 8-14: 3.8% of 32746 checklistsFeb 15-21: 3.7% of 40328 checklistsFeb 22-28: 3.9% of 28432 checklistsMar 1-7: 4.1% of 30758 checklistsMar 8-14: 3.9% of 29368 checklistsMar 15-21: 4.0% of 32580 checklistsMar 22-31: 3.4% of 45614 checklistsApr 1-7: 3.0% of 33997 checklistsApr 8-14: 3.0% of 34729 checklistsApr 15-21: 2.7% of 38474 checklistsApr 22-30: 2.0% of 52185 checklistsMay 1-7: 1.6% of 44236 checklistsMay 8-14: 1.1% of 48708 checklistsMay 15-21: 0.7% of 41742 checklistsMay 22-31: 0.4% of 57082 checklistsJun 1-7: 0.2% of 39193 checklistsJun 8-14: 0.2% of 36042 checklistsJun 15-21: 0.1% of 34003 checklistsJun 22-30: 0.1% of 39711 checklistsJul 1-7: 0.2% of 31949 checklistsJul 8-14: 0.2% of 29086 checklistsJul 15-21: 0.1% of 28045 checklistsJul 22-31: 0.2% of 38275 checklistsAug 1-7: 0.1% of 28846 checklistsAug 8-14: 0.3% of 28036 checklistsAug 15-21: 0.2% of 27614 checklistsAug 22-31: 0.2% of 40356 checklistsSep 1-7: 0.3% of 31214 checklistsSep 8-14: 0.4% of 27795 checklistsSep 15-21: 0.7% of 29677 checklistsSep 22-30: 1.0% of 35241 checklistsOct 1-7: 1.4% of 28605 checklistsOct 8-14: 1.9% of 28655 checklistsOct 15-21: 3.0% of 24643 checklistsOct 22-31: 3.6% of 34874 checklistsNov 1-7: 3.3% of 25658 checklistsNov 8-14: 3.9% of 25700 checklistsNov 15-21: 3.4% of 24331 checklistsNov 22-30: 3.6% of 32784 checklistsDec 1-7: 3.5% of 24099 checklistsDec 8-14: 3.5% of 23339 checklistsDec 15-21: 3.3% of 27666 checklistsDec 22-31: 3.8% of 42130 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 Washington 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 Washington

Best counties

Share of checklists at the peak
  1. Wahkiakum CountyBest late February · 103 checklists that week, 5,618 in all34%
  2. Mason CountyBest the second week of January · 499 checklists that week, 27,853 in all17%
  3. Garfield CountyBest late December · 13 checklists that week, 1,130 in all15%
  4. Whatcom CountyBest late January · 1801 checklists that week, 64,687 in all15%
  5. Grays Harbor CountyBest late January · 573 checklists that week, 28,443 in all14%
  6. Skamania CountyBest early February · 177 checklists that week, 10,140 in all14%

Best spots

Share of checklists at the peak
  1. Whatcom County Parks & RecreationWhatcom County, best early February · 50 checklists that week, 2,753 in all79%
  2. Marine Community ParkClark County, best late January · 23 checklists that week, 471 in all74%
  3. Washburn IslandOkanogan County, best late January · 29 checklists that week, 236 in all69%
  4. Martin's BarCowlitz County, best the second week of February · 26 checklists that week, 440 in all69%
  5. Lake Wallula (Walla Walla River)Walla Walla County, best the second week of November · 23 checklists that week, 357 in all68%
  6. Tracy Owen Station ParkKing County, best the second week of April · 44 checklists that week, 2,233 in all68%

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

Best time of day

In Washington, the Greater Scaup is most often listed on checklists started between 1 and 3 pm (2.8% of those checklists).

0%1%2%3%12 am: too few checklists (796) to judge1 am: too few checklists (776) to judge2 am: too few checklists (709) to judge3 am: too few checklists (901) to judge4 am: too few checklists (3221) to judge5 am: too few checklists (16576) to judge6 am: 1.2% of 56744 checklists7 am: 1.7% of 133294 checklists8 am: 2.0% of 184196 checklists9 am: 2.2% of 186303 checklists10 am: 2.5% of 177063 checklists11 am: 2.6% of 154936 checklists12 pm: 2.7% of 138061 checklists1 pm: 2.8% of 127449 checklists2 pm: 2.8% of 121511 checklists3 pm: 2.5% of 107793 checklists4 pm: 1.7% of 82862 checklists5 pm: 1.2% of 57183 checklists6 pm: 0.7% of 39886 checklists7 pm: too few checklists (26969) to judge8 pm: too few checklists (12427) to judge9 pm: too few checklists (3658) to judge10 pm: too few checklists (1500) to judge11 pm: too few checklists (834) 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
January4.6%4.6%4.7%4.8%
February4.3%3.8%3.7%3.9%
March4.1%3.9%4.0%3.4%
April3.0%3.0%2.7%2.0%
May1.6%1.1%0.7%0.4%
June0.2%0.2%0.1%0.1%
July0.2%0.2%0.1%0.2%
August0.1%0.3%0.2%0.2%
September0.3%0.4%0.7%1.0%
October1.4%1.9%3.0%3.6%
November3.3%3.9%3.4%3.6%
December3.5%3.5%3.3%3.8%

Neighboring states

  • Oregon: arrives the second week of October, 2 weeks later than Washington
  • Montana: arrives late February, 20 weeks later than Washington
  • Nevada: arrives early November, 5 weeks later than Washington
  • California: arrives late October, 4 weeks later than Washington

Common questions

When do Greater Scaups arrive in Washington?
Greater Scaups are winter birds in Washington: the first arrive in late September, they are common by the second week of October, peak in mid January (4.7% of checklists), and most are gone by late April.
When do Greater Scaups leave Washington?
Most Greater Scaups have left Washington by late April, when reports fall below half their usual rate. Stragglers are still reported until the second week of May.
When is the best time to see a Greater Scaup in Washington?
The Greater Scaup is reported most often in mid January, on about 4.7% of Washington checklists.
Where in Washington are Greater Scaups seen most often?
By county, Wahkiakum County, Mason County, and Garfield County have the highest peak reporting rates for the Greater Scaup (counties with at least 200 checklists).