WhenToBird

Setophaga pensylvanica · Parulidae

When Do Chestnut-sided Warblers Arrive in Kansas?

Adult male Chestnut-sided Warbler
Photo: Matt Felperin, CC BY 4.0 via iNaturalist

Chestnut-sided Warblers mostly pass through Kansas: they arrive in early May, peak in mid May (3.2% of checklists), and most are gone by late May.

When to look

First arrivalsMay 1-7early May
Common byMay 1-7early May
PeakMay 15-21mid May
Most gone byMay 22-31late May

Best: mid May. First arrivals early May; most are gone by late May. Peak: on about 3.2% of Kansas checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Apruncommon
  5. Maypeak season
  6. Jununcommon
  7. Julnot usually seen
  8. Augrare
  9. Sepuncommon
  10. Octrare
  11. Novnot usually seen
  12. Decnot usually seen

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

0%2%4%6%Jan 1-7: 0% of 8683 checklistsJan 8-14: 0% of 5710 checklistsJan 15-21: 0% of 5453 checklistsJan 22-31: 0% of 7868 checklistsFeb 1-7: 0% of 5579 checklistsFeb 8-14: 0% of 6307 checklistsFeb 15-21: 0% of 7830 checklistsFeb 22-28: 0% of 6124 checklistsMar 1-7: 0% of 6442 checklistsMar 8-14: 0% of 6925 checklistsMar 15-21: 0% of 7257 checklistsMar 22-31: 0% of 11527 checklistsApr 1-7: 0% of 8908 checklistsApr 8-14: 0% of 11070 checklistsApr 15-21: 0% of 11050 checklistsApr 22-30: 0.1% of 16381 checklistsMay 1-7: 1.3% of 15899 checklistsMay 8-14: 3.9% of 15349 checklistsMay 15-21: 4.6% of 10474 checklistsMay 22-31: 1.0% of 11264 checklistsJun 1-7: 0.1% of 6783 checklistsJun 8-14: 0% of 5654 checklistsJun 15-21: 0% of 4716 checklistsJun 22-30: 0% of 6232 checklistsJul 1-7: 0% of 5073 checklistsJul 8-14: 0% of 4528 checklistsJul 15-21: 0% of 4210 checklistsJul 22-31: 0% of 5986 checklistsAug 1-7: 0% of 4661 checklistsAug 8-14: 0% of 4762 checklistsAug 15-21: 0.1% of 4823 checklistsAug 22-31: 0.3% of 7214 checklistsSep 1-7: 0.7% of 5989 checklistsSep 8-14: 0.6% of 5549 checklistsSep 15-21: 0.4% of 5255 checklistsSep 22-30: 0.3% of 7370 checklistsOct 1-7: 0.1% of 5829 checklistsOct 8-14: 0% of 6183 checklistsOct 15-21: 0.1% of 5504 checklistsOct 22-31: 0% of 7289 checklistsNov 1-7: 0% of 5535 checklistsNov 8-14: 0% of 5462 checklistsNov 15-21: 0% of 4929 checklistsNov 22-30: 0% of 6627 checklistsDec 1-7: 0% of 4670 checklistsDec 8-14: 0% of 4805 checklistsDec 15-21: 0% of 6341 checklistsDec 22-31: 0% of 8186 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 Kansas 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 Kansas

Best counties

Share of checklists at the peak
  1. Johnson CountyBest mid May · 2361 checklists that week, 66,867 in all8.0%
  2. Shawnee CountyBest mid May · 525 checklists that week, 16,596 in all7.5%
  3. Bourbon CountyBest mid May · 25 checklists that week, 765 in all7.3%
  4. Linn CountyBest the second week of May · 138 checklists that week, 2,601 in all6.8%
  5. Crawford CountyBest mid May · 89 checklists that week, 2,687 in all6.1%
  6. Atchison CountyBest mid May · 91 checklists that week, 3,228 in all5.5%

Best spots

Share of checklists at the peak
  1. Tomahawk Creek GreenwayJohnson County, best late May · 51 checklists that week, 641 in all45%
  2. Mill Creek Streamway (Little Mill Creek)Johnson County, best mid May · 55 checklists that week, 300 in all32%
  3. Felker ParkShawnee County, best mid May · 53 checklists that week, 988 in all29%
  4. AntiochJohnson County, best late May · 25 checklists that week, 399 in all29%
  5. Blue Valley Recreation ComplexJohnson County, best the second week of May · 51 checklists that week, 127 in all28%
  6. Ernie Miller ParkJohnson County, best mid May · 22 checklists that week, 319 in all27%

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

Best time of day

In Kansas, the Chestnut-sided Warbler is most often listed on checklists started between 6 and 8 am (1.3% of those checklists).

0%1%2%3%12 am: too few checklists (150) to judge1 am: too few checklists (119) to judge2 am: too few checklists (97) to judge3 am: too few checklists (94) to judge4 am: too few checklists (124) to judge5 am: too few checklists (1459) to judge6 am: 2.3% of 12550 checklists7 am: 1.0% of 34128 checklists8 am: 0.6% of 45960 checklists9 am: 0.4% of 37806 checklists10 am: 0.3% of 32102 checklists11 am: 0.3% of 25896 checklists12 pm: 0.2% of 24203 checklists1 pm: 0.2% of 20269 checklists2 pm: 0.2% of 20772 checklists3 pm: 0.2% of 20978 checklists4 pm: 0.1% of 22094 checklists5 pm: 0.2% of 17739 checklists6 pm: 0.1% of 13963 checklists7 pm: 0.1% of 10110 checklists8 pm: too few checklists (4188) to judge9 pm: too few checklists (968) to judge10 pm: too few checklists (325) to judge11 pm: too few checklists (171) 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%0%0%0%
April0%0%0%0.1%
May1.3%3.9%4.6%1.0%
June0.1%0%0%0%
July0%0%0%0%
August0%0%0.1%0.3%
September0.7%0.6%0.4%0.3%
October0.1%0%0.1%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Nebraska: arrives early May, in the same week than Kansas
  • Missouri: arrives late April, 1 week earlier than Kansas
  • Arkansas: arrives late April, 1 week earlier than Kansas
  • Iowa: arrives the second week of August, 13 weeks later than Kansas

Common questions

When do Chestnut-sided Warblers arrive in Kansas?
Chestnut-sided Warblers mostly pass through Kansas: they arrive in early May, peak in mid May (3.2% of checklists), and most are gone by late May.
When do Chestnut-sided Warblers leave Kansas?
Most Chestnut-sided Warblers have left Kansas by late May, when reports fall below half their usual rate.
When is the best time to see a Chestnut-sided Warbler in Kansas?
The Chestnut-sided Warbler is reported most often in mid May, on about 3.2% of Kansas checklists.
Where in Kansas are Chestnut-sided Warblers seen most often?
By county, Johnson County, Shawnee County, and Bourbon County have the highest peak reporting rates for the Chestnut-sided Warbler (counties with at least 200 checklists).