WhenToBird

Aythya marila · Anatidae

When Do Greater Scaups Arrive in Oregon?

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

Greater Scaups are winter birds in Oregon: they arrive in the second week of October, peak in early March (2.5% of checklists), and most are gone by mid April.

When to look

First arrivalsOct 8-14the second week of October
Common byOct 8-14the second week of October
PeakMar 1-7early March
Most gone byApr 15-21mid April

Best: early March. First arrivals the second week of October; most are gone by mid April. Peak: on about 2.5% of Oregon checklists.

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

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

0%1%2%3%Jan 1-7: 2.3% of 34973 checklistsJan 8-14: 2.4% of 26807 checklistsJan 15-21: 2.4% of 26567 checklistsJan 22-31: 2.2% of 36019 checklistsFeb 1-7: 2.2% of 24020 checklistsFeb 8-14: 1.9% of 25765 checklistsFeb 15-21: 1.8% of 31019 checklistsFeb 22-28: 2.3% of 24582 checklistsMar 1-7: 2.5% of 24834 checklistsMar 8-14: 2.6% of 24642 checklistsMar 15-21: 1.9% of 27420 checklistsMar 22-31: 1.7% of 39913 checklistsApr 1-7: 1.7% of 28817 checklistsApr 8-14: 1.3% of 31221 checklistsApr 15-21: 1.1% of 34402 checklistsApr 22-30: 1.0% of 47144 checklistsMay 1-7: 0.8% of 37716 checklistsMay 8-14: 0.6% of 39651 checklistsMay 15-21: 0.4% of 37496 checklistsMay 22-31: 0.2% of 56967 checklistsJun 1-7: 0.2% of 35893 checklistsJun 8-14: 0.1% of 31880 checklistsJun 15-21: 0.1% of 30942 checklistsJun 22-30: 0.1% of 38478 checklistsJul 1-7: 0.1% of 27409 checklistsJul 8-14: 0.1% of 25161 checklistsJul 15-21: 0.1% of 25473 checklistsJul 22-31: 0.1% of 33920 checklistsAug 1-7: 0.1% of 24310 checklistsAug 8-14: 0.1% of 23675 checklistsAug 15-21: 0.1% of 23623 checklistsAug 22-31: 0.1% of 33762 checklistsSep 1-7: 0.1% of 25120 checklistsSep 8-14: 0.1% of 24458 checklistsSep 15-21: 0.1% of 25528 checklistsSep 22-30: 0.3% of 31631 checklistsOct 1-7: 0.5% of 25498 checklistsOct 8-14: 1.1% of 25161 checklistsOct 15-21: 1.7% of 23701 checklistsOct 22-31: 2.2% of 30996 checklistsNov 1-7: 2.2% of 21089 checklistsNov 8-14: 2.0% of 21880 checklistsNov 15-21: 2.1% of 21501 checklistsNov 22-30: 2.0% of 28930 checklistsDec 1-7: 1.9% of 19807 checklistsDec 8-14: 1.6% of 21022 checklistsDec 15-21: 1.7% of 24817 checklistsDec 22-31: 2.2% of 37592 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 Oregon 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 Oregon

Best counties

Share of checklists at the peak
  1. Gilliam CountyBest the second week of February · 40 checklists that week, 2,323 in all24%
  2. Hood River CountyBest the second week of November · 176 checklists that week, 9,695 in all16%
  3. Clatsop CountyBest early March · 691 checklists that week, 44,300 in all13%
  4. Lincoln CountyBest early March · 1014 checklists that week, 66,994 in all13%
  5. Sherman CountyBest the second week of December · 47 checklists that week, 4,629 in all11%
  6. Morrow CountyBest mid December · 30 checklists that week, 3,484 in all11%

Best spots

Share of checklists at the peak
  1. Rogue River (east)Jackson County, best early January · 21 checklists that week, 321 in all85%
  2. M James Gleason Memorial Boat RampMultnomah County, best late February · 63 checklists that week, 5,550 in all73%
  3. Astoria Reservoir Number TwoClatsop County, best late April · 20 checklists that week, 548 in all71%
  4. Lowell Covered BridgeLane County, best the second week of January · 25 checklists that week, 281 in all68%
  5. Hayden BayMultnomah County, best mid December · 42 checklists that week, 1,905 in all66%

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

Best time of day

In Oregon, the Greater Scaup is most often listed on checklists started between 1 and 3 pm (1.6% of those checklists).

0%0.5%1%1.5%2%12 am: too few checklists (1505) to judge1 am: too few checklists (675) to judge2 am: too few checklists (626) to judge3 am: too few checklists (1641) to judge4 am: too few checklists (3696) to judge5 am: too few checklists (14524) to judge6 am: 0.3% of 50677 checklists7 am: 0.7% of 125347 checklists8 am: 1.1% of 163668 checklists9 am: 1.3% of 160351 checklists10 am: 1.3% of 148940 checklists11 am: 1.5% of 124743 checklists12 pm: 1.5% of 112537 checklists1 pm: 1.6% of 98999 checklists2 pm: 1.5% of 94690 checklists3 pm: 1.5% of 87923 checklists4 pm: 0.9% of 75235 checklists5 pm: 0.6% of 54504 checklists6 pm: 0.4% of 40469 checklists7 pm: 0.2% of 33675 checklists8 pm: too few checklists (18715) to judge9 pm: too few checklists (5839) to judge10 pm: too few checklists (2704) to judge11 pm: too few checklists (1549) 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
January2.3%2.4%2.4%2.2%
February2.2%1.9%1.8%2.3%
March2.5%2.6%1.9%1.7%
April1.7%1.3%1.1%1.0%
May0.8%0.6%0.4%0.2%
June0.2%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%0.3%
October0.5%1.1%1.7%2.2%
November2.2%2.0%2.1%2.0%
December1.9%1.6%1.7%2.2%

Neighboring states

  • Washington: arrives late September, 2 weeks earlier than Oregon
  • Nevada: arrives early November, 3 weeks later than Oregon
  • California: arrives late October, 2 weeks later than Oregon
  • Montana: arrives late February, 18 weeks later than Oregon

Common questions

When do Greater Scaups arrive in Oregon?
Greater Scaups are winter birds in Oregon: they arrive in the second week of October, peak in early March (2.5% of checklists), and most are gone by mid April.
When do Greater Scaups leave Oregon?
Most Greater Scaups have left Oregon by mid April, when reports fall below half their usual rate.
When is the best time to see a Greater Scaup in Oregon?
The Greater Scaup is reported most often in early March, on about 2.5% of Oregon checklists.
Where in Oregon are Greater Scaups seen most often?
By county, Gilliam County, Hood River County, and Clatsop County have the highest peak reporting rates for the Greater Scaup (counties with at least 200 checklists).