WhenToBird

Aythya marila · Anatidae

When Do Greater Scaups Arrive in Alaska?

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

Greater Scaups are in Alaska all year, but most are here in spring: numbers build from early May, peak in late May (12% of checklists), and fall back by mid June. In the quietest week (mid August) they are still on about 2.7% of checklists.

When to look

Numbers buildMay 1-7early May
PeakMay 22-31late May
Fall back byJun 15-21mid June
FewestAug 15-21mid August

Best: late May. Here all year; numbers build from early May and fall back by mid June. Peak: on about 12% of Alaska checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maypeak season
  6. Junpeak season
  7. Juluncommon
  8. Auguncommon
  9. Sepcommon
  10. Octcommon
  11. Novcommon
  12. Deccommon

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

0%5%10%15%Jan 1-7: 5.5% of 3788 checklistsJan 8-14: 5.4% of 2852 checklistsJan 15-21: 5.3% of 2810 checklistsJan 22-31: 5.7% of 3629 checklistsFeb 1-7: 6.4% of 2519 checklistsFeb 8-14: 6.5% of 2927 checklistsFeb 15-21: 6.1% of 3743 checklistsFeb 22-28: 6.1% of 2846 checklistsMar 1-7: 6.2% of 2904 checklistsMar 8-14: 6.2% of 3073 checklistsMar 15-21: 5.7% of 3359 checklistsMar 22-31: 6.0% of 5855 checklistsApr 1-7: 5.4% of 4329 checklistsApr 8-14: 6.8% of 4949 checklistsApr 15-21: 6.3% of 7114 checklistsApr 22-30: 6.7% of 10916 checklistsMay 1-7: 8.6% of 11827 checklistsMay 8-14: 11% of 14115 checklistsMay 15-21: 13% of 12152 checklistsMay 22-31: 12% of 19919 checklistsJun 1-7: 13% of 15816 checklistsJun 8-14: 11% of 17194 checklistsJun 15-21: 8.8% of 15943 checklistsJun 22-30: 6.2% of 16192 checklistsJul 1-7: 3.7% of 9815 checklistsJul 8-14: 3.3% of 8263 checklistsJul 15-21: 3.2% of 7081 checklistsJul 22-31: 3.2% of 9434 checklistsAug 1-7: 3.0% of 6380 checklistsAug 8-14: 2.9% of 6258 checklistsAug 15-21: 2.7% of 6114 checklistsAug 22-31: 2.5% of 8189 checklistsSep 1-7: 3.0% of 5848 checklistsSep 8-14: 3.5% of 4853 checklistsSep 15-21: 4.3% of 4415 checklistsSep 22-30: 5.9% of 5086 checklistsOct 1-7: 7.6% of 3576 checklistsOct 8-14: 8.4% of 4212 checklistsOct 15-21: 8.3% of 3339 checklistsOct 22-31: 8.7% of 4169 checklistsNov 1-7: 6.5% of 2844 checklistsNov 8-14: 5.2% of 2753 checklistsNov 15-21: 4.5% of 2291 checklistsNov 22-30: 4.1% of 3066 checklistsDec 1-7: 4.9% of 2199 checklistsDec 8-14: 4.6% of 2472 checklistsDec 15-21: 4.9% of 3071 checklistsDec 22-31: 5.8% of 3442 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 Alaska 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 Alaska

Best counties

Share of checklists at the peak
  1. Aleutians West Census AreaBest mid February · 18 checklists that week, 6,087 in all43%
  2. Northwest Arctic BoroughBest early October · 14 checklists that week, 1,386 in all41%
  3. Kusilvak Census AreaBest early June · 26 checklists that week, 573 in all39%
  4. Kodiak Island BoroughBest late February · 179 checklists that week, 11,483 in all37%
  5. Hoonah-Angoon Census AreaBest mid February · 90 checklists that week, 8,159 in all26%
  6. Bethel Census AreaBest mid May · 198 checklists that week, 2,783 in all25%

Best spots

Share of checklists at the peak
  1. Chester Creek GreenbeltAnchorage Municipality, best the second week of June · 291 checklists that week, 4,339 in all78%
  2. Kasilof RiverKenai Peninsula Borough, best late April · 35 checklists that week, 929 in all78%
  3. Hood LakeAnchorage Municipality, best late August · 34 checklists that week, 2,805 in all74%
  4. Chester Creek Greenbelt (Westchester Lake)Anchorage Municipality, best mid May · 58 checklists that week, 2,640 in all73%
  5. Beluga Lake (west)Kenai Peninsula Borough, best the second week of May · 50 checklists that week, 255 in all72%

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

Best time of day

In Alaska, the Greater Scaup is most often listed on checklists started between 7 and 9 pm (9.6% of those checklists).

0%5%10%15%12 am: too few checklists (549) to judge1 am: too few checklists (365) to judge2 am: too few checklists (291) to judge3 am: too few checklists (624) to judge4 am: too few checklists (1241) to judge5 am: too few checklists (3532) to judge6 am: 6.5% of 9751 checklists7 am: 7.0% of 17236 checklists8 am: 6.8% of 24936 checklists9 am: 6.5% of 30139 checklists10 am: 6.6% of 30866 checklists11 am: 6.6% of 28207 checklists12 pm: 6.5% of 25650 checklists1 pm: 6.9% of 24144 checklists2 pm: 7.1% of 23323 checklists3 pm: 7.3% of 20763 checklists4 pm: 8.0% of 18245 checklists5 pm: 7.9% of 14895 checklists6 pm: 8.5% of 11707 checklists7 pm: 9.1% of 9365 checklists8 pm: 10% of 6934 checklists9 pm: too few checklists (4176) to judge10 pm: too few checklists (2050) to judge11 pm: too few checklists (952) 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
January5.5%5.4%5.3%5.7%
February6.4%6.5%6.1%6.1%
March6.2%6.2%5.7%6.0%
April5.4%6.8%6.3%6.7%
May8.6%11%13%12%
June13%11%8.8%6.2%
July3.7%3.3%3.2%3.2%
August3.0%2.9%2.7%2.5%
September3.0%3.5%4.3%5.9%
October7.6%8.4%8.3%8.7%
November6.5%5.2%4.5%4.1%
December4.9%4.6%4.9%5.8%

Neighboring states

  • Washington: arrives late September, 19 weeks later than Alaska
  • Oregon: arrives the second week of October, 21 weeks later than Alaska
  • Montana: arrives late February, 9 weeks earlier than Alaska
  • California: arrives late October, 23 weeks later than Alaska

Common questions

When do Greater Scaups arrive in Alaska?
Greater Scaups are in Alaska all year, but most are here in spring: numbers build from early May, peak in late May (12% of checklists), and fall back by mid June. In the quietest week (mid August) they are still on about 2.7% of checklists.
When do Greater Scaups leave Alaska?
Greater Scaups never fully leave Alaska: numbers fall back below half their usual rate by mid June, but some are still reported in every week, about 2.7% of checklists at the low.
When is the best time to see a Greater Scaup in Alaska?
The Greater Scaup is reported most often in late May, on about 12% of Alaska checklists.
Where in Alaska are Greater Scaups seen most often?
By county, Aleutians West Census Area, Northwest Arctic Borough, and Kusilvak Census Area have the highest peak reporting rates for the Greater Scaup (counties with at least 200 checklists).