WhenToBird

Contopus cooperi · Tyrannidae

When Do Olive-sided Flycatchers Arrive in Kansas?

Adult Olive-sided Flycatcher
Photo: Brooke J., CC BY 4.0 via iNaturalist

Olive-sided Flycatchers mostly pass through Kansas: they arrive in the second week of August, peak in the second week of September (3.7% of checklists), and most are gone by late September.

When to look

First arrivalsAug 8-14the second week of August
Common byAug 8-14the second week of August
PeakSep 8-14the second week of September
Most gone bySep 22-30late September

Best: the second week of September. First arrivals the second week of August; most are gone by late September. Peak: on about 3.7% of Kansas checklists.

  1. Jannot usually seen
  2. Febnot usually seen
  3. Marnot usually seen
  4. Aprrare
  5. Mayuncommon
  6. Jununcommon
  7. Julnot usually seen
  8. Augcommon
  9. Seppeak season
  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: 0.5% of 15899 checklistsMay 8-14: 1.0% of 15349 checklistsMay 15-21: 1.8% of 10474 checklistsMay 22-31: 1.6% of 11264 checklistsJun 1-7: 0.5% of 6783 checklistsJun 8-14: 0.1% of 5654 checklistsJun 15-21: 0% of 4716 checklistsJun 22-30: 0% of 6232 checklistsJul 1-7: 0% of 5073 checklistsJul 8-14: 0.1% of 4528 checklistsJul 15-21: 0% of 4210 checklistsJul 22-31: 0.1% of 5986 checklistsAug 1-7: 0.1% of 4661 checklistsAug 8-14: 0.6% of 4762 checklistsAug 15-21: 0.9% of 4823 checklistsAug 22-31: 2.3% of 7214 checklistsSep 1-7: 4.7% of 5989 checklistsSep 8-14: 4.0% of 5549 checklistsSep 15-21: 2.2% of 5255 checklistsSep 22-30: 0.6% of 7370 checklistsOct 1-7: 0.1% of 5829 checklistsOct 8-14: 0% of 6183 checklistsOct 15-21: 0% 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. Hamilton CountyBest the second week of September · 16 checklists that week, 655 in all19%
  2. Seward CountyBest the second week of September · 11 checklists that week, 566 in all15%
  3. Coffey CountyBest the second week of September · 15 checklists that week, 1,497 in all14%
  4. Smith CountyBest the second week of September · 23 checklists that week, 484 in all13%
  5. Grant CountyBest mid May · 16 checklists that week, 344 in all13%
  6. Marion CountyBest the second week of September · 23 checklists that week, 3,168 in all12%

Best spots

Share of checklists at the peak
  1. Felker ParkShawnee County, best early September · 26 checklists that week, 988 in all32%
  2. Prairie CenterJohnson County, best late August · 25 checklists that week, 757 in all27%
  3. Cimarron National Grassland (East Headquarters Pasture)Morton County, best early September · 23 checklists that week, 262 in all17%
  4. Clear Creek LakeAtchison County, best late August · 34 checklists that week, 615 in all15%
  5. Cimarron National GrasslandMorton County, best early September · 39 checklists that week, 495 in all14%

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

Best time of day

In Kansas, the Olive-sided Flycatcher is most often listed on checklists started between 6 and 8 am (0.8% 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: 0.9% of 12550 checklists7 am: 0.8% of 34128 checklists8 am: 0.6% of 45960 checklists9 am: 0.4% of 37806 checklists10 am: 0.4% of 32102 checklists11 am: 0.3% of 25896 checklists12 pm: 0.4% of 24203 checklists1 pm: 0.3% of 20269 checklists2 pm: 0.3% of 20772 checklists3 pm: 0.3% of 20978 checklists4 pm: 0.3% of 22094 checklists5 pm: 0.3% of 17739 checklists6 pm: 0.6% of 13963 checklists7 pm: 0.5% 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%
May0.5%1.0%1.8%1.6%
June0.5%0.1%0%0%
July0%0.1%0%0.1%
August0.1%0.6%0.9%2.3%
September4.7%4.0%2.2%0.6%
October0.1%0%0%0%
November0%0%0%0%
December0%0%0%0%

Neighboring states

  • Nebraska: arrives mid August, 1 week later than Kansas
  • Oklahoma: arrives mid August, 1 week later than Kansas
  • Missouri: arrives mid August, 1 week later than Kansas
  • Iowa: arrives the second week of August, in the same week than Kansas

Common questions

When do Olive-sided Flycatchers arrive in Kansas?
Olive-sided Flycatchers mostly pass through Kansas: they arrive in the second week of August, peak in the second week of September (3.7% of checklists), and most are gone by late September.
When do Olive-sided Flycatchers leave Kansas?
Most Olive-sided Flycatchers have left Kansas by late September, when reports fall below half their usual rate.
When is the best time to see a Olive-sided Flycatcher in Kansas?
The Olive-sided Flycatcher is reported most often in the second week of September, on about 3.7% of Kansas checklists.
Where in Kansas are Olive-sided Flycatchers seen most often?
By county, Hamilton County, Seward County, and Coffey County have the highest peak reporting rates for the Olive-sided Flycatcher (counties with at least 200 checklists).