WhenToBird

Charadrius vociferus · Charadriidae

When Do Killdeers Arrive in Pennsylvania?

Adult Killdeer
Photo: Mason Holum, CC BY 4.0 via iNaturalist

Killdeers reach Pennsylvania in the second week of February, are common by late February, peak in the second week of August (12% of checklists), and most are gone by early November.

When to look

First arrivalsFeb 8-14the second week of February
Common byFeb 22-28late February
PeakAug 8-14the second week of August
Most gone byNov 1-7early November

Best: the second week of August. First arrivals the second week of February; most are gone by early November. Peak: on about 12% of Pennsylvania checklists.

  1. Janrare
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novcommon
  12. Decrare

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

0%5%10%15%Jan 1-7: 0.6% of 47145 checklistsJan 8-14: 0.5% of 35840 checklistsJan 15-21: 0.7% of 35423 checklistsJan 22-31: 0.5% of 49126 checklistsFeb 1-7: 0.8% of 36366 checklistsFeb 8-14: 1.6% of 42248 checklistsFeb 15-21: 2.4% of 55888 checklistsFeb 22-28: 6.6% of 42050 checklistsMar 1-7: 10% of 42709 checklistsMar 8-14: 11% of 43985 checklistsMar 15-21: 11% of 44547 checklistsMar 22-31: 12% of 66940 checklistsApr 1-7: 11% of 51147 checklistsApr 8-14: 11% of 54868 checklistsApr 15-21: 11% of 57252 checklistsApr 22-30: 11% of 81727 checklistsMay 1-7: 9.8% of 76472 checklistsMay 8-14: 9.2% of 79341 checklistsMay 15-21: 10% of 61724 checklistsMay 22-31: 10% of 70722 checklistsJun 1-7: 9.4% of 45652 checklistsJun 8-14: 8.8% of 41810 checklistsJun 15-21: 9.0% of 38973 checklistsJun 22-30: 8.9% of 44255 checklistsJul 1-7: 9.3% of 34822 checklistsJul 8-14: 9.7% of 31104 checklistsJul 15-21: 11% of 29262 checklistsJul 22-31: 12% of 41436 checklistsAug 1-7: 12% of 29189 checklistsAug 8-14: 12% of 28840 checklistsAug 15-21: 12% of 29948 checklistsAug 22-31: 12% of 48235 checklistsSep 1-7: 11% of 37175 checklistsSep 8-14: 9.7% of 36527 checklistsSep 15-21: 9.8% of 37261 checklistsSep 22-30: 10% of 43583 checklistsOct 1-7: 11% of 35352 checklistsOct 8-14: 8.8% of 35560 checklistsOct 15-21: 8.1% of 33119 checklistsOct 22-31: 7.8% of 44654 checklistsNov 1-7: 6.6% of 32965 checklistsNov 8-14: 4.9% of 31305 checklistsNov 15-21: 3.2% of 29471 checklistsNov 22-30: 2.1% of 38642 checklistsDec 1-7: 1.7% of 28779 checklistsDec 8-14: 1.4% of 29486 checklistsDec 15-21: 0.9% of 37465 checklistsDec 22-31: 0.7% of 50651 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 Pennsylvania 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 Pennsylvania

Best counties

Share of checklists at the peak
  1. Montour CountyBest early October · 76 checklists that week, 6,082 in all36%
  2. Franklin CountyBest mid August · 507 checklists that week, 36,756 in all33%
  3. Mercer CountyBest mid August · 257 checklists that week, 17,853 in all30%
  4. Westmoreland CountyBest late August · 509 checklists that week, 28,322 in all29%
  5. Crawford CountyBest late August · 450 checklists that week, 23,552 in all28%
  6. Mifflin CountyBest the second week of August · 45 checklists that week, 6,998 in all27%

Best spots

Share of checklists at the peak
  1. Sedimentation Pond Number ThreeAllegheny County, best the second week of June · 49 checklists that week, 1,371 in all100%
  2. Flaugherty RunAllegheny County, best late August · 22 checklists that week, 238 in all97%

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

Best time of day

In Pennsylvania, the Killdeer is most often listed on checklists started between 6 and 8 pm (11% of those checklists).

0%5%10%15%12 am: too few checklists (1558) to judge1 am: too few checklists (1136) to judge2 am: too few checklists (839) to judge3 am: too few checklists (842) to judge4 am: too few checklists (2550) to judge5 am: too few checklists (18294) to judge6 am: 9.5% of 92903 checklists7 am: 7.6% of 241233 checklists8 am: 7.9% of 271994 checklists9 am: 8.1% of 236842 checklists10 am: 7.5% of 199508 checklists11 am: 7.1% of 161893 checklists12 pm: 6.8% of 143945 checklists1 pm: 6.7% of 134352 checklists2 pm: 6.8% of 129692 checklists3 pm: 6.9% of 126132 checklists4 pm: 8.1% of 115055 checklists5 pm: 11% of 90719 checklists6 pm: 11% of 67534 checklists7 pm: 11% of 43004 checklists8 pm: too few checklists (13966) to judge9 pm: too few checklists (3913) to judge10 pm: too few checklists (1989) to judge11 pm: too few checklists (1146) 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
January0.6%0.5%0.7%0.5%
February0.8%1.6%2.4%6.6%
March10%11%11%12%
April11%11%11%11%
May9.8%9.2%10%10%
June9.4%8.8%9.0%8.9%
July9.3%9.7%11%12%
August12%12%12%12%
September11%9.7%9.8%10%
October11%8.8%8.1%7.8%
November6.6%4.9%3.2%2.1%
December1.7%1.4%0.9%0.7%

Neighboring states

  • Maryland: arrives early February, 1 week earlier than Pennsylvania
  • District of Columbia: arrives the second week of February, in the same week than Pennsylvania
  • Delaware: arrives early February, 1 week earlier than Pennsylvania
  • New Jersey: arrives the second week of February, in the same week than Pennsylvania

Common questions

When do Killdeers arrive in Pennsylvania?
Killdeers reach Pennsylvania in the second week of February, are common by late February, peak in the second week of August (12% of checklists), and most are gone by early November.
When do Killdeers leave Pennsylvania?
Most Killdeers have left Pennsylvania by early November, when reports fall below half their usual rate. Stragglers are still reported until the second week of December.
When is the best time to see a Killdeer in Pennsylvania?
The Killdeer is reported most often in the second week of August, on about 12% of Pennsylvania checklists.
Where in Pennsylvania are Killdeers seen most often?
By county, Montour County, Franklin County, and Mercer County have the highest peak reporting rates for the Killdeer (counties with at least 200 checklists).