WhenToBird

Pandion haliaetus · Pandionidae

When Do Ospreys Arrive in Louisiana?

Adult female Osprey
Photo: Bill Levine, CC BY 4.0 via iNaturalist

Ospreys are in Louisiana all year, but most are here in fall: numbers build from the second week of September, peak in the second week of October (11% of checklists), and fall back by late December. In the quietest week (the second week of June) they are still on about 3.4% of checklists.

When to look

Numbers buildSep 8-14the second week of September
PeakOct 8-14the second week of October
Fall back byDec 22-31late December
FewestJun 8-14the second week of June

Best: the second week of October. Here all year; numbers build from the second week of September and fall back by late December. Peak: on about 11% of Louisiana checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprcommon
  5. Maycommon
  6. Jununcommon
  7. Julcommon
  8. Augcommon
  9. Seppeak season
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%5%10%15%Jan 1-7: 6.3% of 8384 checklistsJan 8-14: 6.0% of 6265 checklistsJan 15-21: 5.7% of 6825 checklistsJan 22-31: 5.9% of 8776 checklistsFeb 1-7: 6.5% of 5956 checklistsFeb 8-14: 5.8% of 6291 checklistsFeb 15-21: 5.3% of 8044 checklistsFeb 22-28: 6.8% of 5946 checklistsMar 1-7: 7.6% of 5981 checklistsMar 8-14: 8.2% of 6307 checklistsMar 15-21: 8.3% of 6747 checklistsMar 22-31: 7.6% of 10487 checklistsApr 1-7: 7.2% of 8037 checklistsApr 8-14: 7.9% of 9577 checklistsApr 15-21: 7.5% of 11372 checklistsApr 22-30: 5.3% of 14344 checklistsMay 1-7: 4.1% of 8193 checklistsMay 8-14: 3.9% of 6823 checklistsMay 15-21: 3.1% of 4818 checklistsMay 22-31: 4.2% of 6206 checklistsJun 1-7: 3.5% of 3660 checklistsJun 8-14: 3.8% of 3455 checklistsJun 15-21: 2.8% of 3084 checklistsJun 22-30: 4.0% of 3904 checklistsJul 1-7: 3.4% of 3240 checklistsJul 8-14: 3.8% of 3235 checklistsJul 15-21: 3.7% of 3167 checklistsJul 22-31: 4.2% of 4328 checklistsAug 1-7: 5.8% of 3192 checklistsAug 8-14: 5.4% of 3394 checklistsAug 15-21: 5.3% of 3502 checklistsAug 22-31: 6.0% of 5658 checklistsSep 1-7: 6.0% of 4366 checklistsSep 8-14: 7.4% of 4648 checklistsSep 15-21: 7.8% of 4369 checklistsSep 22-30: 8.8% of 6418 checklistsOct 1-7: 8.8% of 5375 checklistsOct 8-14: 11% of 6213 checklistsOct 15-21: 12% of 5553 checklistsOct 22-31: 9.1% of 8879 checklistsNov 1-7: 8.4% of 6231 checklistsNov 8-14: 10% of 5011 checklistsNov 15-21: 8.5% of 4856 checklistsNov 22-30: 8.0% of 6696 checklistsDec 1-7: 6.9% of 4530 checklistsDec 8-14: 7.5% of 4883 checklistsDec 15-21: 7.7% of 5833 checklistsDec 22-31: 7.8% of 9940 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 Louisiana 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.

Embed this map on your site

Where in Louisiana

Best counties

Share of checklists at the peak
  1. Plaquemines ParishBest early November · 116 checklists that week, 3,374 in all54%
  2. St. Bernard ParishBest the second week of November · 24 checklists that week, 1,331 in all34%
  3. Jefferson ParishBest the second week of October · 618 checklists that week, 25,795 in all32%
  4. Sabine ParishBest early April · 12 checklists that week, 541 in all30%
  5. St. Martin ParishBest early July · 66 checklists that week, 4,923 in all29%
  6. St. John the Baptist ParishBest early August · 18 checklists that week, 957 in all29%

Best spots

Share of checklists at the peak
  1. Big Branch Marsh National Wildlife Refuge (Bayou Cochon)St. Tammany Parish, best mid November · 27 checklists that week, 1,384 in all80%
  2. Fosters CanalPlaquemines Parish, best early November · 28 checklists that week, 363 in all77%
  3. Mandeville Lakefront ParkSt. Tammany Parish, best the second week of August · 24 checklists that week, 1,193 in all76%
  4. Bayou Thunder Von TrancJefferson Parish, best mid October · 25 checklists that week, 675 in all73%
  5. Grand Isle (northeast)Jefferson Parish, best the second week of October · 47 checklists that week, 1,232 in all73%

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

Best time of day

In Louisiana, the Osprey is most often listed on checklists started between 1 and 3 pm (7.6% of those checklists).

0%2%4%6%8%12 am: too few checklists (110) to judge1 am: too few checklists (95) to judge2 am: too few checklists (78) to judge3 am: too few checklists (145) to judge4 am: too few checklists (266) to judge5 am: too few checklists (2981) to judge6 am: 6.5% of 21115 checklists7 am: 6.2% of 38843 checklists8 am: 7.0% of 36306 checklists9 am: 7.3% of 31934 checklists10 am: 7.5% of 27208 checklists11 am: 7.3% of 20733 checklists12 pm: 7.3% of 18505 checklists1 pm: 7.4% of 17383 checklists2 pm: 7.9% of 17422 checklists3 pm: 6.7% of 17005 checklists4 pm: 6.3% of 17170 checklists5 pm: 4.9% of 12536 checklists6 pm: 3.1% of 8080 checklists7 pm: too few checklists (3798) to judge8 pm: too few checklists (676) to judge9 pm: too few checklists (311) to judge10 pm: too few checklists (206) to judge11 pm: too few checklists (93) 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
January6.3%6.0%5.7%5.9%
February6.5%5.8%5.3%6.8%
March7.6%8.2%8.3%7.6%
April7.2%7.9%7.5%5.3%
May4.1%3.9%3.1%4.2%
June3.5%3.8%2.8%4.0%
July3.4%3.8%3.7%4.2%
August5.8%5.4%5.3%6.0%
September6.0%7.4%7.8%8.8%
October8.8%11%12%9.1%
November8.4%10%8.5%8.0%
December6.9%7.5%7.7%7.8%

Neighboring states

  • Mississippi: year-round, peaks mid March
  • Alabama: arrives early March, 23 weeks later than Louisiana
  • Texas: arrives mid June, 11 weeks earlier than Louisiana
  • Arkansas: arrives early August, 5 weeks earlier than Louisiana

Common questions

When do Ospreys arrive in Louisiana?
Ospreys are in Louisiana all year, but most are here in fall: numbers build from the second week of September, peak in the second week of October (11% of checklists), and fall back by late December. In the quietest week (the second week of June) they are still on about 3.4% of checklists.
When do Ospreys leave Louisiana?
Ospreys never fully leave Louisiana: numbers fall back below half their usual rate by late December, but some are still reported in every week, about 3.4% of checklists at the low.
When is the best time to see a Osprey in Louisiana?
The Osprey is reported most often in the second week of October, on about 11% of Louisiana checklists.
Where in Louisiana are Ospreys seen most often?
By county, Plaquemines Parish, St. Bernard Parish, and Jefferson Parish have the highest peak reporting rates for the Osprey (counties with at least 200 checklists).