WhenToBird

Astur cooperii · Accipitridae

When Do Cooper's Hawks Arrive in Maryland?

Adult male Cooper's Hawk
Photo: Shirley Zundell, CC BY 4.0 via iNaturalist

Cooper's Hawks are in Maryland all year, but most are here in fall: numbers build from the second week of September, peak in the second week of October (8.9% of checklists), and fall back by late November. In the quietest week (the second week of July) they are still on about 2.1% of checklists.

When to look

Numbers buildSep 8-14the second week of September
PeakOct 8-14the second week of October
Fall back byNov 22-30late November
FewestJul 8-14the second week of July

Best: the second week of October. Here all year; numbers build from the second week of September and fall back by late November. Peak: on about 8.9% of Maryland checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprcommon
  5. Mayuncommon
  6. Jununcommon
  7. Juluncommon
  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%Jan 1-7: 4.2% of 28716 checklistsJan 8-14: 4.3% of 21449 checklistsJan 15-21: 4.3% of 21267 checklistsJan 22-31: 4.2% of 29144 checklistsFeb 1-7: 3.8% of 21347 checklistsFeb 8-14: 3.7% of 22166 checklistsFeb 15-21: 3.4% of 29986 checklistsFeb 22-28: 3.7% of 22427 checklistsMar 1-7: 4.0% of 21389 checklistsMar 8-14: 4.2% of 22192 checklistsMar 15-21: 4.4% of 22823 checklistsMar 22-31: 4.5% of 33720 checklistsApr 1-7: 4.8% of 25513 checklistsApr 8-14: 4.8% of 27718 checklistsApr 15-21: 4.7% of 29328 checklistsApr 22-30: 4.4% of 42595 checklistsMay 1-7: 3.1% of 38532 checklistsMay 8-14: 2.8% of 42722 checklistsMay 15-21: 2.4% of 31936 checklistsMay 22-31: 2.3% of 36903 checklistsJun 1-7: 2.3% of 23191 checklistsJun 8-14: 2.1% of 21853 checklistsJun 15-21: 2.3% of 21000 checklistsJun 22-30: 2.2% of 25133 checklistsJul 1-7: 2.2% of 18715 checklistsJul 8-14: 1.9% of 16376 checklistsJul 15-21: 2.0% of 15793 checklistsJul 22-31: 2.5% of 21969 checklistsAug 1-7: 3.0% of 16013 checklistsAug 8-14: 3.2% of 15249 checklistsAug 15-21: 3.8% of 15674 checklistsAug 22-31: 4.2% of 24925 checklistsSep 1-7: 4.9% of 19808 checklistsSep 8-14: 5.5% of 18513 checklistsSep 15-21: 7.7% of 21901 checklistsSep 22-30: 8.1% of 22901 checklistsOct 1-7: 8.7% of 19111 checklistsOct 8-14: 8.7% of 18482 checklistsOct 15-21: 9.4% of 17380 checklistsOct 22-31: 8.3% of 23992 checklistsNov 1-7: 7.3% of 17915 checklistsNov 8-14: 6.4% of 18905 checklistsNov 15-21: 6.0% of 16259 checklistsNov 22-30: 5.2% of 22852 checklistsDec 1-7: 5.4% of 16108 checklistsDec 8-14: 4.8% of 16512 checklistsDec 15-21: 5.3% of 18952 checklistsDec 22-31: 4.4% of 29728 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 Maryland 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 Maryland

Best counties

Share of checklists at the peak
  1. Cecil CountyBest early October · 276 checklists that week, 18,620 in all18%
  2. Queen Anne's CountyBest mid October · 395 checklists that week, 26,875 in all17%
  3. Baltimore CountyBest the second week of October · 2588 checklists that week, 136,139 in all15%
  4. Harford CountyBest the second week of October · 580 checklists that week, 39,311 in all14%
  5. Howard CountyBest the second week of October · 1787 checklists that week, 118,290 in all11%
  6. Talbot CountyBest mid October · 519 checklists that week, 31,140 in all10%

Best spots

Share of checklists at the peak
  1. Turkey PointCecil County, best the second week of October · 50 checklists that week, 976 in all63%
  2. Patterson ParkBaltimore County, best early October · 111 checklists that week, 5,451 in all45%
  3. Fort Smallwood ParkAnne Arundel County, best the second week of April · 97 checklists that week, 2,199 in all44%
  4. Southwest Area ParkBaltimore County, best mid October · 22 checklists that week, 1,230 in all41%

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

Best time of day

In Maryland, the Cooper's Hawk is most often listed on checklists started between 7 and 9 am (5.7% of those checklists).

0%2%4%6%12 am: too few checklists (486) to judge1 am: too few checklists (451) to judge2 am: too few checklists (447) to judge3 am: too few checklists (766) to judge4 am: too few checklists (2076) to judge5 am: too few checklists (11098) to judge6 am: 5.0% of 56604 checklists7 am: 5.9% of 139255 checklists8 am: 5.4% of 148626 checklists9 am: 5.0% of 126820 checklists10 am: 4.4% of 106973 checklists11 am: 3.8% of 87483 checklists12 pm: 3.6% of 74808 checklists1 pm: 3.8% of 69428 checklists2 pm: 3.9% of 67800 checklists3 pm: 3.8% of 67688 checklists4 pm: 3.7% of 60927 checklists5 pm: 3.1% of 43876 checklists6 pm: 2.6% of 32930 checklists7 pm: too few checklists (19051) to judge8 pm: too few checklists (5708) to judge9 pm: too few checklists (1977) to judge10 pm: too few checklists (1170) to judge11 pm: too few checklists (635) 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
January4.2%4.3%4.3%4.2%
February3.8%3.7%3.4%3.7%
March4.0%4.2%4.4%4.5%
April4.8%4.8%4.7%4.4%
May3.1%2.8%2.4%2.3%
June2.3%2.1%2.3%2.2%
July2.2%1.9%2.0%2.5%
August3.0%3.2%3.8%4.2%
September4.9%5.5%7.7%8.1%
October8.7%8.7%9.4%8.3%
November7.3%6.4%6.0%5.2%
December5.4%4.8%5.3%4.4%

Neighboring states

  • District of Columbia: arrives mid July, 7 weeks earlier than Maryland
  • Delaware: arrives early September, 1 week earlier than Maryland
  • Virginia: arrives early July, 9 weeks earlier than Maryland
  • Pennsylvania: arrives the second week of September, in the same week than Maryland

Common questions

When do Cooper's Hawks arrive in Maryland?
Cooper's Hawks are in Maryland all year, but most are here in fall: numbers build from the second week of September, peak in the second week of October (8.9% of checklists), and fall back by late November. In the quietest week (the second week of July) they are still on about 2.1% of checklists.
When do Cooper's Hawks leave Maryland?
Cooper's Hawks never fully leave Maryland: numbers fall back below half their usual rate by late November, but some are still reported in every week, about 2.1% of checklists at the low.
When is the best time to see a Cooper's Hawk in Maryland?
The Cooper's Hawk is reported most often in the second week of October, on about 8.9% of Maryland checklists.
Where in Maryland are Cooper's Hawks seen most often?
By county, Cecil County, Queen Anne's County, and Baltimore County have the highest peak reporting rates for the Cooper's Hawk (counties with at least 200 checklists).