WhenToBird

Mergus serrator · Anatidae

When Do Red-breasted Mergansers Arrive in Nevada?

Adult male Red-breasted Merganser
Photo: Peter Chen 2.0, CC BY 4.0 via iNaturalist

Red-breasted Mergansers are winter birds in Nevada: they arrive in early November, peak in the second week of January (1.8% of checklists), and most are gone by early April.

When to look

First arrivalsNov 1-7early November
Common byNov 1-7early November
PeakJan 8-14the second week of January
Most gone byApr 1-7early April

Best: the second week of January. First arrivals early November; most are gone by early April. Peak: on about 1.8% of Nevada checklists.

  1. Janpeak season
  2. Febcommon
  3. Marcommon
  4. Apruncommon
  5. Mayuncommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepnot usually seen
  10. Octuncommon
  11. Novcommon
  12. Decpeak season

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

0%1%2%3%Jan 1-7: 1.6% of 5121 checklistsJan 8-14: 1.7% of 3908 checklistsJan 15-21: 2.1% of 4000 checklistsJan 22-31: 1.1% of 4991 checklistsFeb 1-7: 1.3% of 3377 checklistsFeb 8-14: 1.2% of 3747 checklistsFeb 15-21: 0.9% of 4852 checklistsFeb 22-28: 1.0% of 3712 checklistsMar 1-7: 0.8% of 3745 checklistsMar 8-14: 0.7% of 3763 checklistsMar 15-21: 0.6% of 4188 checklistsMar 22-31: 0.6% of 6027 checklistsApr 1-7: 0.6% of 4679 checklistsApr 8-14: 0.5% of 4609 checklistsApr 15-21: 0.4% of 4709 checklistsApr 22-30: 0.5% of 6984 checklistsMay 1-7: 0.3% of 5702 checklistsMay 8-14: 0.2% of 5928 checklistsMay 15-21: 0.1% of 5353 checklistsMay 22-31: 0.1% of 7352 checklistsJun 1-7: 0.1% of 4360 checklistsJun 8-14: 0% of 4183 checklistsJun 15-21: 0% of 3751 checklistsJun 22-30: 0% of 4126 checklistsJul 1-7: 0.1% of 3231 checklistsJul 8-14: 0.1% of 3024 checklistsJul 15-21: 0% of 2967 checklistsJul 22-31: 0% of 4212 checklistsAug 1-7: 0% of 2828 checklistsAug 8-14: 0% of 3036 checklistsAug 15-21: 0% of 3076 checklistsAug 22-31: 0.1% of 4345 checklistsSep 1-7: 0% of 3369 checklistsSep 8-14: 0.1% of 3728 checklistsSep 15-21: 0.1% of 3535 checklistsSep 22-30: 0.1% of 5028 checklistsOct 1-7: 0.1% of 3976 checklistsOct 8-14: 0.1% of 3781 checklistsOct 15-21: 0.2% of 3577 checklistsOct 22-31: 0.2% of 4986 checklistsNov 1-7: 0.5% of 3592 checklistsNov 8-14: 1.0% of 3685 checklistsNov 15-21: 1.2% of 3399 checklistsNov 22-30: 1.0% of 4544 checklistsDec 1-7: 1.1% of 3162 checklistsDec 8-14: 1.0% of 3191 checklistsDec 15-21: 1.1% of 3615 checklistsDec 22-31: 1.3% of 5101 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 Nevada 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 Nevada

Best counties

Share of checklists at the peak
  1. Lyon CountyBest the second week of November · 32 checklists that week, 3,229 in all6.3%
  2. Clark CountyBest the second week of January · 1711 checklists that week, 80,458 in all3.1%
  3. Pershing CountyBest late April · 36 checklists that week, 1,407 in all3.0%
  4. Churchill CountyBest early November · 40 checklists that week, 3,104 in all2.0%
  5. Lincoln CountyBest the second week of December · 55 checklists that week, 3,842 in all1.8%
  6. Washoe CountyBest late January · 1588 checklists that week, 53,497 in all1.3%

Best spots

Share of checklists at the peak
  1. Swim BeachClark County, best mid January · 53 checklists that week, 1,198 in all47%
  2. Hemenway HarborClark County, best early February · 22 checklists that week, 687 in all14%
  3. Crystal ReservoirNye County, best late April · 32 checklists that week, 950 in all14%
  4. Sparks Marina ParkWashoe County, best early March · 35 checklists that week, 1,441 in all13%
  5. Bowman ReservoirClark County, best late April · 27 checklists that week, 313 in all10%

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

Best time of day

In Nevada, the Red-breasted Merganser is most often listed on checklists started between 12 and 2 pm (0.8% of those checklists).

0%0.5%1%12 am: too few checklists (114) to judge1 am: too few checklists (99) to judge2 am: too few checklists (71) to judge3 am: too few checklists (108) to judge4 am: too few checklists (459) to judge5 am: 0.1% of 4313 checklists6 am: 0.5% of 17070 checklists7 am: 0.3% of 27389 checklists8 am: 0.4% of 24858 checklists9 am: 0.6% of 22012 checklists10 am: 0.7% of 19284 checklists11 am: 0.7% of 15592 checklists12 pm: 0.8% of 12432 checklists1 pm: 0.8% of 11386 checklists2 pm: 0.7% of 11262 checklists3 pm: 0.7% of 10721 checklists4 pm: 0.5% of 9090 checklists5 pm: 0.1% of 6397 checklists6 pm: 0.2% of 5012 checklists7 pm: too few checklists (3026) to judge8 pm: too few checklists (905) to judge9 pm: too few checklists (271) to judge10 pm: too few checklists (164) to judge11 pm: too few checklists (120) 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
January1.6%1.7%2.1%1.1%
February1.3%1.2%0.9%1.0%
March0.8%0.7%0.6%0.6%
April0.6%0.5%0.4%0.5%
May0.3%0.2%0.1%0.1%
June0.1%0%0%0%
July0.1%0.1%0%0%
August0%0%0%0.1%
September0%0.1%0.1%0.1%
October0.1%0.1%0.2%0.2%
November0.5%1.0%1.2%1.0%
December1.1%1.0%1.1%1.3%

Neighboring states

  • California: arrives early November, in the same week than Nevada
  • Utah: arrives late February, 15 weeks later than Nevada
  • Idaho: arrives mid October, 2 weeks earlier than Nevada
  • Oregon: arrives late October, 1 week earlier than Nevada

Common questions

When do Red-breasted Mergansers arrive in Nevada?
Red-breasted Mergansers are winter birds in Nevada: they arrive in early November, peak in the second week of January (1.8% of checklists), and most are gone by early April.
When do Red-breasted Mergansers leave Nevada?
Most Red-breasted Mergansers have left Nevada by early April, when reports fall below half their usual rate.
When is the best time to see a Red-breasted Merganser in Nevada?
The Red-breasted Merganser is reported most often in the second week of January, on about 1.8% of Nevada checklists.
Where in Nevada are Red-breasted Mergansers seen most often?
By county, Lyon County, Clark County, and Pershing County have the highest peak reporting rates for the Red-breasted Merganser (counties with at least 200 checklists).