WhenToBird

Oxyura jamaicensis · Anatidae

When Do Ruddy Ducks Arrive in Utah?

Adult male Ruddy Duck
Photo: Anne Parsons, CC0 1.0 via iNaturalist

Ruddy Ducks are winter birds in Utah: the first arrive in the second week of September, they are common by early October, peak in the second week of November (7.1% of checklists), and most are gone by the second week of May.

When to look

First arrivalsSep 8-14the second week of September
Common byOct 1-7early October
PeakNov 8-14the second week of November
Most gone byMay 8-14the second week of May

Best: the second week of November. First arrivals the second week of September; most are gone by the second week of May. Peak: on about 7.1% of Utah checklists.

  1. Janpeak season
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maycommon
  6. Jununcommon
  7. Juluncommon
  8. Auguncommon
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Decpeak season

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

0%2%4%6%8%Jan 1-7: 5.4% of 10857 checklistsJan 8-14: 4.9% of 8333 checklistsJan 15-21: 5.6% of 8360 checklistsJan 22-31: 6.9% of 10516 checklistsFeb 1-7: 6.8% of 7416 checklistsFeb 8-14: 6.5% of 8082 checklistsFeb 15-21: 6.1% of 9643 checklistsFeb 22-28: 6.1% of 7960 checklistsMar 1-7: 6.5% of 7998 checklistsMar 8-14: 5.6% of 8581 checklistsMar 15-21: 6.5% of 8637 checklistsMar 22-31: 6.6% of 13006 checklistsApr 1-7: 7.1% of 10562 checklistsApr 8-14: 6.4% of 11694 checklistsApr 15-21: 6.1% of 11382 checklistsApr 22-30: 5.5% of 16626 checklistsMay 1-7: 4.1% of 13523 checklistsMay 8-14: 3.6% of 14714 checklistsMay 15-21: 3.6% of 13711 checklistsMay 22-31: 2.2% of 16546 checklistsJun 1-7: 1.9% of 10284 checklistsJun 8-14: 1.6% of 9530 checklistsJun 15-21: 1.7% of 8854 checklistsJun 22-30: 1.3% of 10566 checklistsJul 1-7: 1.4% of 7987 checklistsJul 8-14: 1.2% of 7471 checklistsJul 15-21: 1.2% of 7240 checklistsJul 22-31: 1.7% of 9329 checklistsAug 1-7: 1.1% of 6521 checklistsAug 8-14: 1.5% of 6423 checklistsAug 15-21: 1.2% of 6208 checklistsAug 22-31: 1.3% of 9089 checklistsSep 1-7: 1.4% of 7081 checklistsSep 8-14: 2.1% of 7306 checklistsSep 15-21: 2.2% of 7208 checklistsSep 22-30: 3.3% of 8876 checklistsOct 1-7: 3.4% of 7265 checklistsOct 8-14: 4.2% of 7226 checklistsOct 15-21: 5.4% of 7007 checklistsOct 22-31: 5.6% of 8443 checklistsNov 1-7: 7.7% of 6711 checklistsNov 8-14: 7.5% of 6290 checklistsNov 15-21: 6.3% of 6169 checklistsNov 22-30: 7.0% of 8228 checklistsDec 1-7: 5.3% of 6011 checklistsDec 8-14: 4.1% of 6044 checklistsDec 15-21: 3.5% of 6721 checklistsDec 22-31: 4.3% of 9982 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 Utah 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 Utah

Best counties

Share of checklists at the peak
  1. Piute CountyBest late October · 14 checklists that week, 1,035 in all30%
  2. Kane CountyBest the second week of March · 108 checklists that week, 6,105 in all24%
  3. Washington CountyBest mid January · 858 checklists that week, 43,893 in all24%
  4. Iron CountyBest late March · 358 checklists that week, 8,774 in all24%
  5. Beaver CountyBest early November · 160 checklists that week, 6,956 in all22%
  6. Juab CountyBest the second week of March · 74 checklists that week, 2,572 in all22%

Best spots

Share of checklists at the peak
  1. Quail Creek State ParkWashington County, best the second week of February · 24 checklists that week, 904 in all92%
  2. Sand Hollow State ParkWashington County, best early January · 26 checklists that week, 827 in all91%
  3. Springs ParkWashington County, best mid February · 29 checklists that week, 795 in all89%
  4. Spencer Number Two Reservoir (historical)Kane County, best late December · 20 checklists that week, 605 in all87%
  5. Harrisburg CanyonWashington County, best late January · 38 checklists that week, 676 in all85%

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

Best time of day

In Utah, the Ruddy Duck is most often listed on checklists started between 2 and 4 pm (5.5% of those checklists).

0%2%4%6%12 am: too few checklists (242) to judge1 am: too few checklists (178) to judge2 am: too few checklists (169) to judge3 am: too few checklists (162) to judge4 am: too few checklists (284) to judge5 am: too few checklists (1984) to judge6 am: 2.1% of 11714 checklists7 am: 2.7% of 33209 checklists8 am: 3.6% of 46944 checklists9 am: 4.3% of 46290 checklists10 am: 4.5% of 43144 checklists11 am: 5.2% of 36893 checklists12 pm: 5.2% of 32758 checklists1 pm: 5.5% of 30142 checklists2 pm: 5.5% of 29414 checklists3 pm: 5.6% of 29491 checklists4 pm: 4.9% of 29154 checklists5 pm: 3.9% of 22256 checklists6 pm: 2.8% of 17383 checklists7 pm: 2.1% of 13099 checklists8 pm: too few checklists (6647) to judge9 pm: too few checklists (1753) to judge10 pm: too few checklists (599) to judge11 pm: too few checklists (307) 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
January5.4%4.9%5.6%6.9%
February6.8%6.5%6.1%6.1%
March6.5%5.6%6.5%6.6%
April7.1%6.4%6.1%5.5%
May4.1%3.6%3.6%2.2%
June1.9%1.6%1.7%1.3%
July1.4%1.2%1.2%1.7%
August1.1%1.5%1.2%1.3%
September1.4%2.1%2.2%3.3%
October3.4%4.2%5.4%5.6%
November7.7%7.5%6.3%7.0%
December5.3%4.1%3.5%4.3%

Neighboring states

  • Wyoming: arrives mid March, 23 weeks earlier than Utah
  • Nevada: arrives the second week of October, 4 weeks later than Utah
  • Colorado: arrives mid July, 7 weeks earlier than Utah
  • Idaho: arrives late December, 14 weeks later than Utah

Common questions

When do Ruddy Ducks arrive in Utah?
Ruddy Ducks are winter birds in Utah: the first arrive in the second week of September, they are common by early October, peak in the second week of November (7.1% of checklists), and most are gone by the second week of May.
When do Ruddy Ducks leave Utah?
Most Ruddy Ducks have left Utah by the second week of May, when reports fall below half their usual rate. Stragglers are still reported until early June.
When is the best time to see a Ruddy Duck in Utah?
The Ruddy Duck is reported most often in the second week of November, on about 7.1% of Utah checklists.
Where in Utah are Ruddy Ducks seen most often?
By county, Piute County, Kane County, and Washington County have the highest peak reporting rates for the Ruddy Duck (counties with at least 200 checklists).