WhenToBird

Pandion haliaetus · Pandionidae

When Do Ospreys Arrive in Indiana?

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

Ospreys reach Indiana in mid March, are common by late March, peak in mid August (6.4% of checklists), and most are gone by the second week of October.

When to look

First arrivalsMar 15-21mid March
Common byMar 22-31late March
PeakAug 15-21mid August
Most gone byOct 8-14the second week of October

Best: mid August. First arrivals mid March; most are gone by the second week of October. Peak: on about 6.4% of Indiana checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marcommon
  4. Aprcommon
  5. Maycommon
  6. Juncommon
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novrare
  12. Decnot usually seen

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

0%2%4%6%8%Jan 1-7: 0% of 18123 checklistsJan 8-14: 0% of 12006 checklistsJan 15-21: 0% of 12403 checklistsJan 22-31: 0% of 16181 checklistsFeb 1-7: 0% of 12546 checklistsFeb 8-14: 0% of 14250 checklistsFeb 15-21: 0% of 18077 checklistsFeb 22-28: 0% of 13590 checklistsMar 1-7: 0.1% of 14545 checklistsMar 8-14: 0.1% of 14594 checklistsMar 15-21: 1.0% of 13894 checklistsMar 22-31: 2.8% of 22400 checklistsApr 1-7: 3.7% of 18069 checklistsApr 8-14: 3.6% of 19579 checklistsApr 15-21: 4.8% of 19518 checklistsApr 22-30: 4.3% of 30544 checklistsMay 1-7: 3.2% of 28430 checklistsMay 8-14: 2.7% of 30624 checklistsMay 15-21: 2.9% of 22920 checklistsMay 22-31: 2.4% of 21234 checklistsJun 1-7: 2.3% of 12279 checklistsJun 8-14: 2.5% of 10904 checklistsJun 15-21: 2.7% of 9488 checklistsJun 22-30: 2.6% of 11362 checklistsJul 1-7: 2.7% of 9947 checklistsJul 8-14: 3.7% of 9585 checklistsJul 15-21: 3.2% of 8929 checklistsJul 22-31: 4.1% of 12639 checklistsAug 1-7: 5.5% of 9528 checklistsAug 8-14: 6.3% of 9451 checklistsAug 15-21: 6.7% of 9442 checklistsAug 22-31: 6.3% of 14969 checklistsSep 1-7: 6.1% of 12628 checklistsSep 8-14: 5.7% of 11793 checklistsSep 15-21: 4.4% of 11396 checklistsSep 22-30: 4.8% of 14203 checklistsOct 1-7: 3.0% of 11365 checklistsOct 8-14: 2.3% of 12092 checklistsOct 15-21: 1.4% of 10440 checklistsOct 22-31: 0.9% of 13883 checklistsNov 1-7: 0.4% of 10476 checklistsNov 8-14: 0.3% of 9776 checklistsNov 15-21: 0.2% of 9035 checklistsNov 22-30: 0.1% of 12547 checklistsDec 1-7: 0% of 9078 checklistsDec 8-14: 0.1% of 8732 checklistsDec 15-21: 0% of 11024 checklistsDec 22-31: 0% of 15432 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 Indiana 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 Indiana

Best counties

Share of checklists at the peak
  1. Union CountyBest the second week of August · 115 checklists that week, 4,811 in all47%
  2. Clark CountyBest the second week of August · 103 checklists that week, 5,057 in all39%
  3. Franklin CountyBest mid August · 55 checklists that week, 3,657 in all35%
  4. Daviess CountyBest the second week of September · 20 checklists that week, 442 in all33%
  5. Whitley CountyBest early August · 68 checklists that week, 4,695 in all32%
  6. Scott CountyBest early October · 13 checklists that week, 798 in all30%

Best spots

Share of checklists at the peak
  1. Worster LakeSt. Joseph County, best early April · 45 checklists that week, 902 in all80%
  2. Brookville Recreation Area (Salt Well Creek)Franklin County, best late August · 21 checklists that week, 464 in all78%
  3. Worster Lake (east)St. Joseph County, best early May · 21 checklists that week, 262 in all75%
  4. Carlson/Oxbow ParkLake County, best late July · 29 checklists that week, 470 in all72%
  5. Monroe Recreation AreaMonroe County, best the second week of September · 63 checklists that week, 3,126 in all66%
  6. Vaughn HollowBrown County, best mid September · 32 checklists that week, 919 in all64%

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

Best time of day

In Indiana, the Osprey is most often listed on checklists started between 6 and 8 am (2.8% of those checklists).

0%1%2%3%12 am: too few checklists (240) to judge1 am: too few checklists (231) to judge2 am: too few checklists (222) to judge3 am: too few checklists (202) to judge4 am: too few checklists (674) to judge5 am: too few checklists (4329) to judge6 am: 3.0% of 20589 checklists7 am: 2.8% of 58470 checklists8 am: 2.6% of 86931 checklists9 am: 2.7% of 78239 checklists10 am: 2.1% of 66080 checklists11 am: 2.0% of 54904 checklists12 pm: 1.9% of 47610 checklists1 pm: 1.9% of 44814 checklists2 pm: 2.0% of 43790 checklists3 pm: 2.2% of 42983 checklists4 pm: 2.2% of 45349 checklists5 pm: 2.6% of 35993 checklists6 pm: 2.9% of 26447 checklists7 pm: 2.5% of 17740 checklists8 pm: too few checklists (7603) to judge9 pm: too few checklists (1721) to judge10 pm: too few checklists (517) to judge11 pm: too few checklists (272) 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%
March0.1%0.1%1.0%2.8%
April3.7%3.6%4.8%4.3%
May3.2%2.7%2.9%2.4%
June2.3%2.5%2.7%2.6%
July2.7%3.7%3.2%4.1%
August5.5%6.3%6.7%6.3%
September6.1%5.7%4.4%4.8%
October3.0%2.3%1.4%0.9%
November0.4%0.3%0.2%0.1%
December0%0.1%0%0%

Neighboring states

  • Illinois: arrives late March, 1 week later than Indiana
  • Kentucky: arrives the second week of March, 1 week earlier than Indiana
  • Ohio: arrives mid March, in the same week than Indiana
  • Michigan: arrives late March, 1 week later than Indiana

Common questions

When do Ospreys arrive in Indiana?
Ospreys reach Indiana in mid March, are common by late March, peak in mid August (6.4% of checklists), and most are gone by the second week of October.
When do Ospreys leave Indiana?
Most Ospreys have left Indiana by the second week of October, when reports fall below half their usual rate. Stragglers are still reported until mid October.
When is the best time to see a Osprey in Indiana?
The Osprey is reported most often in mid August, on about 6.4% of Indiana checklists.
Where in Indiana are Ospreys seen most often?
By county, Union County, Clark County, and Franklin County have the highest peak reporting rates for the Osprey (counties with at least 200 checklists).