WhenToBird

Plegadis falcinellus · Threskiornithidae

When Do Glossy Ibises Arrive in New York?

Adult Glossy Ibis
Photo: fede2cr, CC BY 4.0 via iNaturalist

Glossy Ibises arrive in New York in late April, peak in the second week of June (2.3% of checklists), and most are gone by late August.

When to look

First arrivalsApr 22-30late April
Common byApr 22-30late April
PeakJun 8-14the second week of June
Most gone byAug 22-31late August

Best: the second week of June. First arrivals late April; most are gone by late August. Peak: on about 2.3% of New York checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprcommon
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Sepuncommon
  10. Octrare
  11. Novnot usually seen
  12. Decnot usually seen

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

0%1%2%3%Jan 1-7: 0% of 66410 checklistsJan 8-14: 0% of 49310 checklistsJan 15-21: 0% of 49919 checklistsJan 22-31: 0% of 62513 checklistsFeb 1-7: 0% of 43526 checklistsFeb 8-14: 0% of 49753 checklistsFeb 15-21: 0% of 65147 checklistsFeb 22-28: 0% of 50173 checklistsMar 1-7: 0% of 50325 checklistsMar 8-14: 0% of 55371 checklistsMar 15-21: 0% of 56293 checklistsMar 22-31: 0.1% of 82677 checklistsApr 1-7: 0.2% of 65295 checklistsApr 8-14: 0.5% of 73080 checklistsApr 15-21: 0.9% of 73857 checklistsApr 22-30: 1.0% of 106093 checklistsMay 1-7: 0.9% of 102772 checklistsMay 8-14: 1.1% of 110051 checklistsMay 15-21: 1.4% of 94797 checklistsMay 22-31: 1.8% of 101272 checklistsJun 1-7: 2.4% of 59471 checklistsJun 8-14: 2.2% of 55497 checklistsJun 15-21: 2.2% of 51761 checklistsJun 22-30: 2.0% of 59219 checklistsJul 1-7: 1.9% of 48226 checklistsJul 8-14: 2.2% of 42315 checklistsJul 15-21: 2.4% of 40637 checklistsJul 22-31: 2.1% of 57183 checklistsAug 1-7: 2.1% of 40461 checklistsAug 8-14: 1.6% of 39880 checklistsAug 15-21: 1.5% of 41146 checklistsAug 22-31: 0.8% of 63381 checklistsSep 1-7: 0.6% of 48640 checklistsSep 8-14: 0.3% of 47882 checklistsSep 15-21: 0.2% of 49063 checklistsSep 22-30: 0.2% of 57906 checklistsOct 1-7: 0.2% of 48447 checklistsOct 8-14: 0.1% of 51901 checklistsOct 15-21: 0.1% of 46717 checklistsOct 22-31: 0.1% of 61992 checklistsNov 1-7: 0.1% of 44593 checklistsNov 8-14: 0.1% of 42566 checklistsNov 15-21: 0% of 39675 checklistsNov 22-30: 0.1% of 51197 checklistsDec 1-7: 0.1% of 36567 checklistsDec 8-14: 0.1% of 37254 checklistsDec 15-21: 0% of 43754 checklistsDec 22-31: 0% of 62470 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 New York 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 New York

Best counties

Share of checklists at the peak
  1. Queens CountyBest late July · 1613 checklists that week, 76,201 in all34%
  2. Nassau CountyBest the second week of June · 1963 checklists that week, 95,019 in all15%
  3. Suffolk CountyBest the second week of June · 3802 checklists that week, 208,865 in all11%
  4. Richmond CountyBest mid June · 941 checklists that week, 55,926 in all9.4%
  5. Kings CountyBest the second week of June · 1484 checklists that week, 134,897 in all4.6%
  6. Genesee CountyBest early August · 218 checklists that week, 17,726 in all4.1%

Best spots

Share of checklists at the peak
  1. Captree State ParkSuffolk County, best the second week of June · 65 checklists that week, 1,784 in all96%
  2. West Pond (The Raut (historical))Queens County, best late June · 21 checklists that week, 1,547 in all94%
  3. East PondQueens County, best late July · 107 checklists that week, 2,028 in all92%
  4. East Pond (Grassy Bay)Queens County, best late July · 83 checklists that week, 794 in all90%
  5. West PondQueens County, best late June · 167 checklists that week, 5,856 in all87%
  6. West Pond (Black Bank Marsh)Queens County, best the second week of June · 141 checklists that week, 4,651 in all85%

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

Best time of day

In New York, the Glossy Ibis is most often listed on checklists started between 9 and 11 am (0.9% of those checklists).

0%0.5%1%12 am: too few checklists (1146) to judge1 am: too few checklists (1055) to judge2 am: too few checklists (1121) to judge3 am: too few checklists (1353) to judge4 am: too few checklists (4785) to judge5 am: too few checklists (32052) to judge6 am: 0.9% of 124869 checklists7 am: 0.6% of 298506 checklists8 am: 0.7% of 337334 checklists9 am: 0.9% of 307787 checklists10 am: 0.8% of 270801 checklists11 am: 0.8% of 233238 checklists12 pm: 0.7% of 213830 checklists1 pm: 0.6% of 193321 checklists2 pm: 0.6% of 180741 checklists3 pm: 0.6% of 170348 checklists4 pm: 0.8% of 147224 checklists5 pm: 0.6% of 111962 checklists6 pm: 0.7% of 78261 checklists7 pm: too few checklists (44425) to judge8 pm: too few checklists (15648) to judge9 pm: too few checklists (4795) to judge10 pm: too few checklists (2454) to judge11 pm: too few checklists (1378) 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
January0%0%0%0%
February0%0%0%0%
March0%0%0%0.1%
April0.2%0.5%0.9%1.0%
May0.9%1.1%1.4%1.8%
June2.4%2.2%2.2%2.0%
July1.9%2.2%2.4%2.1%
August2.1%1.6%1.5%0.8%
September0.6%0.3%0.2%0.2%
October0.2%0.1%0.1%0.1%
November0.1%0.1%0%0.1%
December0.1%0.1%0%0%

Neighboring states

  • Connecticut: arrives early April, 3 weeks earlier than New York
  • New Jersey: arrives early April, 3 weeks earlier than New York
  • Delaware: arrives late March, 4 weeks earlier than New York
  • Rhode Island: arrives early April, 3 weeks earlier than New York

Common questions

When do Glossy Ibises arrive in New York?
Glossy Ibises arrive in New York in late April, peak in the second week of June (2.3% of checklists), and most are gone by late August.
When do Glossy Ibises leave New York?
Most Glossy Ibises have left New York by late August, when reports fall below half their usual rate.
When is the best time to see a Glossy Ibis in New York?
The Glossy Ibis is reported most often in the second week of June, on about 2.3% of New York checklists.
Where in New York are Glossy Ibises seen most often?
By county, Queens County, Nassau County, and Suffolk County have the highest peak reporting rates for the Glossy Ibis (counties with at least 200 checklists).