WhenToBird

Catharus guttatus · Turdidae

When Do Hermit Thrushes Arrive in Illinois?

Adult Hermit Thrush
Photo: Amber M. King, CC BY 4.0 via iNaturalist

Hermit Thrushes are winter birds in Illinois: they arrive in mid September, peak in mid October (15% of checklists), and most are gone by the second week of January.

When to look

First arrivalsSep 15-21mid September
Common bySep 15-21mid September
PeakOct 15-21mid October
Most gone byJan 8-14the second week of January

Best: mid October. First arrivals mid September; most are gone by the second week of January. Peak: on about 15% of Illinois checklists.

  1. Janrare
  2. Febrare
  3. Maruncommon
  4. Aprpeak season
  5. Maycommon
  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%15%20%Jan 1-7: 1.1% of 29700 checklistsJan 8-14: 0.9% of 20189 checklistsJan 15-21: 0.9% of 19784 checklistsJan 22-31: 0.8% of 26641 checklistsFeb 1-7: 0.6% of 20478 checklistsFeb 8-14: 0.5% of 21967 checklistsFeb 15-21: 0.4% of 28735 checklistsFeb 22-28: 0.5% of 24223 checklistsMar 1-7: 0.5% of 26775 checklistsMar 8-14: 0.5% of 27579 checklistsMar 15-21: 0.7% of 27193 checklistsMar 22-31: 1.7% of 42278 checklistsApr 1-7: 6.8% of 34579 checklistsApr 8-14: 13% of 38290 checklistsApr 15-21: 16% of 39261 checklistsApr 22-30: 12% of 59584 checklistsMay 1-7: 6.7% of 60485 checklistsMay 8-14: 2.9% of 59647 checklistsMay 15-21: 0.7% of 43173 checklistsMay 22-31: 0.1% of 47913 checklistsJun 1-7: 0.1% of 31151 checklistsJun 8-14: 0% of 27692 checklistsJun 15-21: 0.1% of 23983 checklistsJun 22-30: 0% of 28448 checklistsJul 1-7: 0.1% of 21273 checklistsJul 8-14: 0% of 19284 checklistsJul 15-21: 0% of 17712 checklistsJul 22-31: 0% of 24500 checklistsAug 1-7: 0% of 18498 checklistsAug 8-14: 0% of 19331 checklistsAug 15-21: 0.1% of 19983 checklistsAug 22-31: 0.1% of 31892 checklistsSep 1-7: 0.1% of 26396 checklistsSep 8-14: 0.1% of 25011 checklistsSep 15-21: 0.8% of 23597 checklistsSep 22-30: 3.4% of 30638 checklistsOct 1-7: 8.2% of 23949 checklistsOct 8-14: 16% of 24412 checklistsOct 15-21: 18% of 22359 checklistsOct 22-31: 11% of 29794 checklistsNov 1-7: 5.4% of 21877 checklistsNov 8-14: 3.0% of 19742 checklistsNov 15-21: 2.1% of 18989 checklistsNov 22-30: 1.4% of 23905 checklistsDec 1-7: 1.5% of 16935 checklistsDec 8-14: 1.4% of 16687 checklistsDec 15-21: 2.1% of 20931 checklistsDec 22-31: 1.6% of 29011 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 Illinois 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 Illinois

Best counties

Share of checklists at the peak
  1. Union CountyBest the second week of November · 35 checklists that week, 4,191 in all31%
  2. Wabash CountyBest the second week of December · 15 checklists that week, 602 in all28%
  3. Cook CountyBest mid October · 7536 checklists that week, 432,644 in all27%
  4. Brown CountyBest the second week of December · 13 checklists that week, 403 in all25%
  5. Piatt CountyBest mid October · 68 checklists that week, 4,640 in all24%
  6. Johnson CountyBest the second week of November · 11 checklists that week, 2,856 in all22%

Best spots

Share of checklists at the peak
  1. Lincoln (Abraham)Cook County, best mid October · 863 checklists that week, 40,318 in all73%
  2. Lincoln (Abraham) (Pine Grove)Cook County, best mid October · 141 checklists that week, 5,010 in all71%
  3. Chicago Women's Park and GardensCook County, best mid April · 33 checklists that week, 555 in all71%
  4. Ewing IiiMcLean County, best the second week of April · 84 checklists that week, 2,378 in all69%
  5. Riis (Jacob)Cook County, best mid October · 20 checklists that week, 914 in all69%

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

Best time of day

In Illinois, the Hermit Thrush is most often listed on checklists started between 6 and 8 am (4.6% of those checklists).

0%2%4%6%12 am: too few checklists (484) to judge1 am: too few checklists (631) to judge2 am: too few checklists (485) to judge3 am: too few checklists (610) to judge4 am: too few checklists (2321) to judge5 am: too few checklists (23536) to judge6 am: 4.7% of 95511 checklists7 am: 4.5% of 164584 checklists8 am: 4.3% of 163654 checklists9 am: 3.8% of 141804 checklists10 am: 3.4% of 122882 checklists11 am: 3.2% of 100640 checklists12 pm: 3.3% of 89894 checklists1 pm: 3.1% of 82729 checklists2 pm: 2.8% of 79801 checklists3 pm: 2.8% of 82169 checklists4 pm: 3.5% of 75124 checklists5 pm: 3.2% of 57708 checklists6 pm: 1.9% of 41843 checklists7 pm: too few checklists (20943) to judge8 pm: too few checklists (6131) to judge9 pm: too few checklists (1677) to judge10 pm: too few checklists (843) to judge11 pm: too few checklists (448) 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
January1.1%0.9%0.9%0.8%
February0.6%0.5%0.4%0.5%
March0.5%0.5%0.7%1.7%
April6.8%13%16%12%
May6.7%2.9%0.7%0.1%
June0.1%0%0.1%0%
July0.1%0%0%0%
August0%0%0.1%0.1%
September0.1%0.1%0.8%3.4%
October8.2%16%18%11%
November5.4%3.0%2.1%1.4%
December1.5%1.4%2.1%1.6%

Neighboring states

  • Indiana: arrives mid March, 24 weeks earlier than Illinois
  • Wisconsin: arrives the second week of September, 1 week earlier than Illinois
  • Michigan: arrives the second week of September, 1 week earlier than Illinois
  • Iowa: arrives mid March, 24 weeks earlier than Illinois

Common questions

When do Hermit Thrushes arrive in Illinois?
Hermit Thrushes are winter birds in Illinois: they arrive in mid September, peak in mid October (15% of checklists), and most are gone by the second week of January.
When do Hermit Thrushes leave Illinois?
Most Hermit Thrushes have left Illinois by the second week of January, when reports fall below half their usual rate.
When is the best time to see a Hermit Thrush in Illinois?
The Hermit Thrush is reported most often in mid October, on about 15% of Illinois checklists.
Where in Illinois are Hermit Thrushes seen most often?
By county, Union County, Wabash County, and Cook County have the highest peak reporting rates for the Hermit Thrush (counties with at least 200 checklists).