WhenToBird

Botaurus exilis · Ardeidae

When Do Least Bitterns Arrive in Kansas?

Adult Least Bittern
Photo: William J. Deml, CC BY 4.0 via iNaturalist

Least Bitterns arrive in Kansas in mid May, peak in early June (1.1% of checklists), and most are gone by late July.

When to look

First arrivalsMay 15-21mid May
Common byMay 15-21mid May
PeakJun 1-7early June
Most gone byJul 22-31late July

Best: early June. First arrivals mid May; most are gone by late July. Peak: on about 1.1% of Kansas checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprrare
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Auguncommon
  9. Seprare
  10. Octnot usually seen
  11. Novnot usually seen
  12. Decnot usually seen

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

0%0.5%1%1.5%Jan 1-7: 0% of 8683 checklistsJan 8-14: 0% of 5710 checklistsJan 15-21: 0% of 5453 checklistsJan 22-31: 0.1% of 7868 checklistsFeb 1-7: 0.1% 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: 0.1% of 11050 checklistsApr 22-30: 0.1% of 16381 checklistsMay 1-7: 0.2% of 15899 checklistsMay 8-14: 0.2% of 15349 checklistsMay 15-21: 0.7% of 10474 checklistsMay 22-31: 1.2% of 11264 checklistsJun 1-7: 1.1% of 6783 checklistsJun 8-14: 0.9% of 5654 checklistsJun 15-21: 0.8% of 4716 checklistsJun 22-30: 1.0% of 6232 checklistsJul 1-7: 1.0% of 5073 checklistsJul 8-14: 0.8% of 4528 checklistsJul 15-21: 0.7% of 4210 checklistsJul 22-31: 0.2% of 5986 checklistsAug 1-7: 0.4% of 4661 checklistsAug 8-14: 0.3% of 4762 checklistsAug 15-21: 0.3% of 4823 checklistsAug 22-31: 0.2% of 7214 checklistsSep 1-7: 0.1% of 5989 checklistsSep 8-14: 0.1% of 5549 checklistsSep 15-21: 0.1% of 5255 checklistsSep 22-30: 0% 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. Douglas CountyBest early June · 760 checklists that week, 40,815 in all7.3%
  2. Neosho CountyBest late May · 61 checklists that week, 2,366 in all4.3%
  3. Stafford CountyBest late July · 173 checklists that week, 6,839 in all4.3%
  4. Labette CountyBest the second week of June · 31 checklists that week, 1,249 in all4.2%
  5. Sedgwick CountyBest late June · 494 checklists that week, 22,601 in all3.8%
  6. Barton CountyBest the second week of August · 62 checklists that week, 4,391 in all3.8%

Best spots

Share of checklists at the peak
  1. Baker University Wetlands (south)Douglas County, best the second week of June · 24 checklists that week, 1,405 in all51%
  2. Pracht Wetlands ParkSedgwick County, best late June · 53 checklists that week, 848 in all48%
  3. Baker University WetlandsDouglas County, best early June · 67 checklists that week, 1,611 in all34%
  4. Quivira National Wildlife RefugeStafford County, best the second week of August · 29 checklists that week, 1,247 in all14%

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

Best time of day

In Kansas, the Least Bittern is most often listed on checklists started between 6 and 8 am (0.5% of those checklists).

0%0.5%1%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: 0.8% of 12550 checklists7 am: 0.4% of 34128 checklists8 am: 0.2% of 45960 checklists9 am: 0.2% of 37806 checklists10 am: 0.1% of 32102 checklists11 am: 0.1% of 25896 checklists12 pm: 0.1% of 24203 checklists1 pm: 0.1% of 20269 checklists2 pm: 0.1% of 20772 checklists3 pm: 0.1% of 20978 checklists4 pm: 0.1% of 22094 checklists5 pm: 0.2% of 17739 checklists6 pm: 0.2% of 13963 checklists7 pm: 0.3% 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%0.1%
February0.1%0%0%0%
March0%0%0%0%
April0%0%0.1%0.1%
May0.2%0.2%0.7%1.2%
June1.1%0.9%0.8%1.0%
July1.0%0.8%0.7%0.2%
August0.4%0.3%0.3%0.2%
September0.1%0.1%0.1%0%
October0.1%0%0.1%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Texas: arrives early April, 6 weeks earlier than Kansas
  • Mississippi: arrives the second week of April, 5 weeks earlier than Kansas
  • Louisiana: arrives the second week of April, 5 weeks earlier than Kansas
  • Arizona: arrives early March, 10 weeks earlier than Kansas

Common questions

When do Least Bitterns arrive in Kansas?
Least Bitterns arrive in Kansas in mid May, peak in early June (1.1% of checklists), and most are gone by late July.
When do Least Bitterns leave Kansas?
Most Least Bitterns have left Kansas by late July, when reports fall below half their usual rate.
When is the best time to see a Least Bittern in Kansas?
The Least Bittern is reported most often in early June, on about 1.1% of Kansas checklists.
Where in Kansas are Least Bitterns seen most often?
By county, Douglas County, Neosho County, and Stafford County have the highest peak reporting rates for the Least Bittern (counties with at least 200 checklists).