WhenToBird

Zonotrichia leucophrys · Passerellidae

When Do White-crowned Sparrows Arrive in Connecticut?

Adult White-crowned Sparrow
Photo: Alan Rockefeller, CC BY 4.0 via iNaturalist

White-crowned Sparrows mostly pass through Connecticut: the first show up in late September, they are common by early October, peak in mid October (7.6% of checklists), and most are gone by early November.

When to look

First arrivalsSep 22-30late September
Common byOct 1-7early October
PeakOct 15-21mid October
Most gone byNov 1-7early November

Best: mid October. First arrivals late September; most are gone by early November. Peak: on about 7.6% of Connecticut checklists.

  1. Janrare
  2. Febrare
  3. Marrare
  4. Aprrare
  5. Mayuncommon
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepuncommon
  10. Octpeak season
  11. Novcommon
  12. Decrare

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

0%5%10%Jan 1-7: 0.5% of 18950 checklistsJan 8-14: 0.7% of 13676 checklistsJan 15-21: 0.6% of 13377 checklistsJan 22-31: 0.6% of 17004 checklistsFeb 1-7: 0.4% of 10218 checklistsFeb 8-14: 0.3% of 11568 checklistsFeb 15-21: 0.3% of 15916 checklistsFeb 22-28: 0.2% of 11413 checklistsMar 1-7: 0.3% of 10754 checklistsMar 8-14: 0.3% of 12051 checklistsMar 15-21: 0.3% of 12616 checklistsMar 22-31: 0.3% of 17801 checklistsApr 1-7: 0.4% of 13186 checklistsApr 8-14: 0.4% of 14428 checklistsApr 15-21: 0.3% of 14738 checklistsApr 22-30: 0.4% of 21753 checklistsMay 1-7: 1.6% of 22494 checklistsMay 8-14: 1.6% of 23363 checklistsMay 15-21: 0.6% of 20219 checklistsMay 22-31: 0.1% of 20778 checklistsJun 1-7: 0% of 12234 checklistsJun 8-14: 0% of 12491 checklistsJun 15-21: 0% of 10856 checklistsJun 22-30: 0% of 11964 checklistsJul 1-7: 0% of 9437 checklistsJul 8-14: 0% of 8599 checklistsJul 15-21: 0% of 8252 checklistsJul 22-31: 0% of 11329 checklistsAug 1-7: 0% of 8116 checklistsAug 8-14: 0% of 8051 checklistsAug 15-21: 0% of 8502 checklistsAug 22-31: 0% of 13673 checklistsSep 1-7: 0% of 9873 checklistsSep 8-14: 0% of 9735 checklistsSep 15-21: 0.1% of 10120 checklistsSep 22-30: 1.5% of 12543 checklistsOct 1-7: 3.8% of 10735 checklistsOct 8-14: 8.3% of 10869 checklistsOct 15-21: 8.2% of 10436 checklistsOct 22-31: 6.4% of 13808 checklistsNov 1-7: 1.9% of 10507 checklistsNov 8-14: 1.2% of 9827 checklistsNov 15-21: 0.8% of 9904 checklistsNov 22-30: 0.6% of 13396 checklistsDec 1-7: 0.4% of 8974 checklistsDec 8-14: 0.4% of 9468 checklistsDec 15-21: 0.5% of 11614 checklistsDec 22-31: 0.4% of 16616 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 Connecticut 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 Connecticut

Best counties

Share of checklists at the peak
  1. New Haven CountyBest mid October · 2657 checklists that week, 139,721 in all11%
  2. Fairfield CountyBest mid October · 2417 checklists that week, 139,848 in all11%
  3. Tolland CountyBest the second week of October · 753 checklists that week, 39,004 in all7.1%
  4. New London CountyBest mid October · 889 checklists that week, 65,205 in all5.3%
  5. Hartford CountyBest mid October · 1796 checklists that week, 105,735 in all5.2%
  6. Windham CountyBest mid October · 259 checklists that week, 19,034 in all3.9%

Best spots

Share of checklists at the peak
  1. Glastonbury MeadowsHartford County, best late October · 23 checklists that week, 683 in all76%
  2. Allen's MeadowFairfield County, best mid October · 125 checklists that week, 1,095 in all67%
  3. West SimsburyHartford County, best mid October · 62 checklists that week, 556 in all53%
  4. Trout Brook ValleyFairfield County, best mid October · 40 checklists that week, 1,588 in all53%
  5. Mohawk SwampNew Haven County, best mid October · 144 checklists that week, 3,247 in all49%

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

Best time of day

In Connecticut, the White-crowned Sparrow is most often listed on checklists started between 7 and 9 am (1.4% of those checklists).

0%0.5%1%1.5%12 am: too few checklists (325) to judge1 am: too few checklists (367) to judge2 am: too few checklists (488) to judge3 am: too few checklists (792) to judge4 am: too few checklists (2722) to judge5 am: too few checklists (9489) to judge6 am: 0.8% of 33657 checklists7 am: 1.5% of 62964 checklists8 am: 1.2% of 70645 checklists9 am: 1.1% of 64870 checklists10 am: 0.9% of 58827 checklists11 am: 0.9% of 51689 checklists12 pm: 0.7% of 45288 checklists1 pm: 0.7% of 44765 checklists2 pm: 0.8% of 44173 checklists3 pm: 0.8% of 41979 checklists4 pm: 0.8% of 33219 checklists5 pm: 0.6% of 24828 checklists6 pm: 0.3% of 15856 checklists7 pm: too few checklists (8126) to judge8 pm: too few checklists (1994) to judge9 pm: too few checklists (533) to judge10 pm: too few checklists (349) to judge11 pm: too few checklists (286) 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
January0.5%0.7%0.6%0.6%
February0.4%0.3%0.3%0.2%
March0.3%0.3%0.3%0.3%
April0.4%0.4%0.3%0.4%
May1.6%1.6%0.6%0.1%
June0%0%0%0%
July0%0%0%0%
August0%0%0%0%
September0%0%0.1%1.5%
October3.8%8.3%8.2%6.4%
November1.9%1.2%0.8%0.6%
December0.4%0.4%0.5%0.4%

Neighboring states

  • Rhode Island: arrives late September, in the same week than Connecticut
  • Massachusetts: arrives mid September, 1 week earlier than Connecticut
  • New Jersey: arrives late September, in the same week than Connecticut
  • New York: arrives mid September, 1 week earlier than Connecticut

Common questions

When do White-crowned Sparrows arrive in Connecticut?
White-crowned Sparrows mostly pass through Connecticut: the first show up in late September, they are common by early October, peak in mid October (7.6% of checklists), and most are gone by early November.
When do White-crowned Sparrows leave Connecticut?
Most White-crowned Sparrows have left Connecticut by early November, when reports fall below half their usual rate. Stragglers are still reported until the second week of November.
When is the best time to see a White-crowned Sparrow in Connecticut?
The White-crowned Sparrow is reported most often in mid October, on about 7.6% of Connecticut checklists.
Where in Connecticut are White-crowned Sparrows seen most often?
By county, New Haven County, Fairfield County, and Tolland County have the highest peak reporting rates for the White-crowned Sparrow (counties with at least 200 checklists).