WhenToBird

Plegadis chihi · Threskiornithidae

When Do White-faced Ibises Arrive in Nevada?

Adult White-faced Ibis
Photo: jubileej, CC0 1.0 via iNaturalist

White-faced Ibises are in Nevada all year, but most are here in summer: numbers build from the second week of July, peak in the second week of August (19% of checklists), and fall back by mid September. In the quietest week (early March) they are still on about 2.4% of checklists.

When to look

Numbers buildJul 8-14the second week of July
PeakAug 8-14the second week of August
Fall back bySep 15-21mid September
FewestMar 1-7early March

Best: the second week of August. Here all year; numbers build from the second week of July and fall back by mid September. Peak: on about 19% of Nevada checklists.

  1. Januncommon
  2. Febuncommon
  3. Maruncommon
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novuncommon
  12. Decuncommon

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

0%10%20%30%Jan 1-7: 2.8% of 5121 checklistsJan 8-14: 3.8% of 3908 checklistsJan 15-21: 3.1% of 4000 checklistsJan 22-31: 3.6% of 4991 checklistsFeb 1-7: 3.2% of 3377 checklistsFeb 8-14: 3.1% of 3747 checklistsFeb 15-21: 2.5% of 4852 checklistsFeb 22-28: 2.7% of 3712 checklistsMar 1-7: 2.3% of 3745 checklistsMar 8-14: 2.1% of 3763 checklistsMar 15-21: 2.7% of 4188 checklistsMar 22-31: 3.2% of 6027 checklistsApr 1-7: 4.0% of 4679 checklistsApr 8-14: 7.2% of 4609 checklistsApr 15-21: 9.2% of 4709 checklistsApr 22-30: 11% of 6984 checklistsMay 1-7: 9.5% of 5702 checklistsMay 8-14: 8.0% of 5928 checklistsMay 15-21: 8.1% of 5353 checklistsMay 22-31: 7.1% of 7352 checklistsJun 1-7: 7.1% of 4360 checklistsJun 8-14: 7.1% of 4183 checklistsJun 15-21: 7.3% of 3751 checklistsJun 22-30: 8.4% of 4126 checklistsJul 1-7: 10% of 3231 checklistsJul 8-14: 13% of 3024 checklistsJul 15-21: 16% of 2967 checklistsJul 22-31: 18% of 4212 checklistsAug 1-7: 18% of 2828 checklistsAug 8-14: 21% of 3036 checklistsAug 15-21: 18% of 3076 checklistsAug 22-31: 18% of 4345 checklistsSep 1-7: 16% of 3369 checklistsSep 8-14: 16% of 3728 checklistsSep 15-21: 11% of 3535 checklistsSep 22-30: 9.4% of 5028 checklistsOct 1-7: 6.5% of 3976 checklistsOct 8-14: 6.9% of 3781 checklistsOct 15-21: 5.7% of 3577 checklistsOct 22-31: 6.3% of 4986 checklistsNov 1-7: 5.1% of 3592 checklistsNov 8-14: 6.2% of 3685 checklistsNov 15-21: 5.4% of 3399 checklistsNov 22-30: 5.6% of 4544 checklistsDec 1-7: 5.0% of 3162 checklistsDec 8-14: 4.4% of 3191 checklistsDec 15-21: 4.1% of 3615 checklistsDec 22-31: 3.8% 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. Churchill CountyBest late July · 71 checklists that week, 3,104 in all58%
  2. Lyon CountyBest early September · 67 checklists that week, 3,229 in all30%
  3. Lander CountyBest the second week of April · 28 checklists that week, 1,413 in all26%
  4. Clark CountyBest mid August · 945 checklists that week, 80,458 in all25%
  5. Pershing CountyBest early August · 18 checklists that week, 1,407 in all23%
  6. Washoe CountyBest early August · 646 checklists that week, 53,497 in all22%

Best spots

Share of checklists at the peak
  1. Swan LakeWashoe County, best early August · 28 checklists that week, 569 in all98%
  2. Swan Lake/Lemmon ValleyWashoe County, best the second week of July · 20 checklists that week, 1,492 in all96%
  3. South Branch Carson RiverChurchill County, best late August · 26 checklists that week, 269 in all95%
  4. Robert B. Griffith Water ProjectClark County, best early September · 43 checklists that week, 2,177 in all88%
  5. Bird Viewing PreserveClark County, best early August · 128 checklists that week, 9,268 in all79%
  6. Pitch Fork CoveClark County, best early September · 35 checklists that week, 1,958 in all75%

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

Best time of day

In Nevada, the White-faced Ibis is most often listed on checklists started between 5 and 7 am (15% of those checklists).

0%5%10%15%20%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: 16% of 4313 checklists6 am: 14% of 17070 checklists7 am: 11% of 27389 checklists8 am: 7.8% of 24858 checklists9 am: 6.5% of 22012 checklists10 am: 6.1% of 19284 checklists11 am: 5.7% of 15592 checklists12 pm: 5.2% of 12432 checklists1 pm: 4.6% of 11386 checklists2 pm: 4.6% of 11262 checklists3 pm: 4.6% of 10721 checklists4 pm: 5.0% of 9090 checklists5 pm: 6.7% of 6397 checklists6 pm: 8.5% 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
January2.8%3.8%3.1%3.6%
February3.2%3.1%2.5%2.7%
March2.3%2.1%2.7%3.2%
April4.0%7.2%9.2%11%
May9.5%8.0%8.1%7.1%
June7.1%7.1%7.3%8.4%
July10%13%16%18%
August18%21%18%18%
September16%16%11%9.4%
October6.5%6.9%5.7%6.3%
November5.1%6.2%5.4%5.6%
December5.0%4.4%4.1%3.8%

Neighboring states

  • California: year-round, peaks late August
  • Utah: arrives early April, 13 weeks earlier than Nevada
  • Idaho: arrives the second week of April, 12 weeks earlier than Nevada
  • Arizona: arrives mid March, 15 weeks earlier than Nevada

Common questions

When do White-faced Ibises arrive in Nevada?
White-faced Ibises are in Nevada all year, but most are here in summer: numbers build from the second week of July, peak in the second week of August (19% of checklists), and fall back by mid September. In the quietest week (early March) they are still on about 2.4% of checklists.
When do White-faced Ibises leave Nevada?
White-faced Ibises never fully leave Nevada: numbers fall back below half their usual rate by mid September, but some are still reported in every week, about 2.4% of checklists at the low.
When is the best time to see a White-faced Ibis in Nevada?
The White-faced Ibis is reported most often in the second week of August, on about 19% of Nevada checklists.
Where in Nevada are White-faced Ibises seen most often?
By county, Churchill County, Lyon County, and Lander County have the highest peak reporting rates for the White-faced Ibis (counties with at least 200 checklists).