WhenToBird

Gavia immer · Gaviidae

When Do Common Loons Arrive in Washington?

Adult Common Loon
Photo: Hungry-Sarracenia Photo, CC BY 4.0 via iNaturalist

Common Loons are winter birds in Washington: the first arrive in early August, they are common by early September, peak in late October (10% of checklists), and most are gone by early May.

When to look

First arrivalsAug 1-7early August
Common bySep 1-7early September
PeakOct 22-31late October
Most gone byMay 1-7early May

Best: late October. First arrivals early August; most are gone by early May. Peak: on about 10% of Washington checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Junrare
  7. Julrare
  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: 6.1% of 41928 checklistsJan 8-14: 5.9% of 31152 checklistsJan 15-21: 6.1% of 31753 checklistsJan 22-31: 5.9% of 42530 checklistsFeb 1-7: 5.2% of 29739 checklistsFeb 8-14: 4.6% of 32746 checklistsFeb 15-21: 4.7% of 40328 checklistsFeb 22-28: 4.8% of 28432 checklistsMar 1-7: 4.9% of 30758 checklistsMar 8-14: 4.7% of 29368 checklistsMar 15-21: 5.3% of 32580 checklistsMar 22-31: 4.8% of 45614 checklistsApr 1-7: 6.2% of 33997 checklistsApr 8-14: 6.6% of 34729 checklistsApr 15-21: 7.9% of 38474 checklistsApr 22-30: 7.7% of 52185 checklistsMay 1-7: 5.4% of 44236 checklistsMay 8-14: 3.0% of 48708 checklistsMay 15-21: 2.0% of 41742 checklistsMay 22-31: 1.4% of 57082 checklistsJun 1-7: 1.2% of 39193 checklistsJun 8-14: 1.2% of 36042 checklistsJun 15-21: 1.1% of 34003 checklistsJun 22-30: 1.3% of 39711 checklistsJul 1-7: 1.1% of 31949 checklistsJul 8-14: 1.2% of 29086 checklistsJul 15-21: 1.2% of 28045 checklistsJul 22-31: 1.4% of 38275 checklistsAug 1-7: 1.7% of 28846 checklistsAug 8-14: 2.1% of 28036 checklistsAug 15-21: 2.4% of 27614 checklistsAug 22-31: 3.2% of 40356 checklistsSep 1-7: 4.5% of 31214 checklistsSep 8-14: 5.8% of 27795 checklistsSep 15-21: 6.4% of 29677 checklistsSep 22-30: 7.2% of 35241 checklistsOct 1-7: 8.2% of 28605 checklistsOct 8-14: 9.0% of 28655 checklistsOct 15-21: 10% of 24643 checklistsOct 22-31: 11% of 34874 checklistsNov 1-7: 9.7% of 25658 checklistsNov 8-14: 9.0% of 25700 checklistsNov 15-21: 7.8% of 24331 checklistsNov 22-30: 7.4% of 32784 checklistsDec 1-7: 7.1% of 24099 checklistsDec 8-14: 6.1% of 23339 checklistsDec 15-21: 5.2% of 27666 checklistsDec 22-31: 5.8% 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. Jefferson CountyBest late October · 1299 checklists that week, 59,663 in all34%
  2. Pacific CountyBest late April · 1007 checklists that week, 19,516 in all30%
  3. Grays Harbor CountyBest late October · 462 checklists that week, 28,443 in all27%
  4. Whatcom CountyBest late November · 1528 checklists that week, 64,687 in all25%
  5. Island CountyBest mid October · 646 checklists that week, 46,092 in all24%
  6. Clallam CountyBest late October · 2260 checklists that week, 85,362 in all24%

Best spots

Share of checklists at the peak
  1. Tongue PointWhatcom County, best early January · 32 checklists that week, 574 in all95%
  2. Lighthouse Marine ParkWhatcom County, best mid February · 30 checklists that week, 1,449 in all93%
  3. Whatcom County Parks & RecreationWhatcom County, best late October · 103 checklists that week, 2,753 in all93%
  4. Tumwater CreekClallam County, best late December · 45 checklists that week, 358 in all92%
  5. SemiahmooWhatcom County, best late November · 24 checklists that week, 451 in all92%

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

Best time of day

In Washington, the Common Loon is most often listed on checklists started between 12 and 2 pm (5.8% of those checklists).

0%2%4%6%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: 3.9% of 56744 checklists7 am: 4.3% of 133294 checklists8 am: 4.6% of 184196 checklists9 am: 5.1% of 186303 checklists10 am: 5.6% of 177063 checklists11 am: 5.7% of 154936 checklists12 pm: 5.7% of 138061 checklists1 pm: 5.9% of 127449 checklists2 pm: 5.7% of 121511 checklists3 pm: 5.1% of 107793 checklists4 pm: 4.0% of 82862 checklists5 pm: 3.3% of 57183 checklists6 pm: 2.5% 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
January6.1%5.9%6.1%5.9%
February5.2%4.6%4.7%4.8%
March4.9%4.7%5.3%4.8%
April6.2%6.6%7.9%7.7%
May5.4%3.0%2.0%1.4%
June1.2%1.2%1.1%1.3%
July1.1%1.2%1.2%1.4%
August1.7%2.1%2.4%3.2%
September4.5%5.8%6.4%7.2%
October8.2%9.0%10%11%
November9.7%9.0%7.8%7.4%
December7.1%6.1%5.2%5.8%

Neighboring states

  • Oregon: arrives early September, 4 weeks later than Washington
  • Idaho: arrives early September, 4 weeks later than Washington
  • Montana: arrives early April, 16 weeks earlier than Washington
  • Nevada: arrives the second week of October, 9 weeks later than Washington

Common questions

When do Common Loons arrive in Washington?
Common Loons are winter birds in Washington: the first arrive in early August, they are common by early September, peak in late October (10% of checklists), and most are gone by early May.
When do Common Loons leave Washington?
Most Common Loons have left Washington by early May, when reports fall below half their usual rate. Stragglers are still reported until mid May.
When is the best time to see a Common Loon in Washington?
The Common Loon is reported most often in late October, on about 10% of Washington checklists.
Where in Washington are Common Loons seen most often?
By county, Jefferson County, Pacific County, and Grays Harbor County have the highest peak reporting rates for the Common Loon (counties with at least 200 checklists).