WhenToBird

Passerina cyanea · Cardinalidae

When Do Indigo Buntings Arrive in Illinois?

Adult male Indigo Bunting
Photo: Kathy Richardson, CC BY 4.0 via iNaturalist

Indigo Buntings reach Illinois in late April, are common by early May, peak in early July (36% of checklists), and most are gone by mid August.

When to look

First arrivalsApr 22-30late April
Common byMay 1-7early May
PeakJul 1-7early July
Most gone byAug 15-21mid August

Best: early July. First arrivals late April; most are gone by mid August. Peak: on about 36% of Illinois checklists.

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

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

0%10%20%30%40%Jan 1-7: 0.1% of 29700 checklistsJan 8-14: 0.1% of 20189 checklistsJan 15-21: 0% of 19784 checklistsJan 22-31: 0.1% of 26641 checklistsFeb 1-7: 0% of 20478 checklistsFeb 8-14: 0% of 21967 checklistsFeb 15-21: 0% of 28735 checklistsFeb 22-28: 0% of 24223 checklistsMar 1-7: 0% of 26775 checklistsMar 8-14: 0% of 27579 checklistsMar 15-21: 0% of 27193 checklistsMar 22-31: 0.1% of 42278 checklistsApr 1-7: 0.1% of 34579 checklistsApr 8-14: 0.1% of 38290 checklistsApr 15-21: 0.6% of 39261 checklistsApr 22-30: 5.4% of 59584 checklistsMay 1-7: 18% of 60485 checklistsMay 8-14: 30% of 59647 checklistsMay 15-21: 37% of 43173 checklistsMay 22-31: 35% of 47913 checklistsJun 1-7: 31% of 31151 checklistsJun 8-14: 33% of 27692 checklistsJun 15-21: 35% of 23983 checklistsJun 22-30: 35% of 28448 checklistsJul 1-7: 37% of 21273 checklistsJul 8-14: 35% of 19284 checklistsJul 15-21: 33% of 17712 checklistsJul 22-31: 33% of 24500 checklistsAug 1-7: 32% of 18498 checklistsAug 8-14: 27% of 19331 checklistsAug 15-21: 22% of 19983 checklistsAug 22-31: 13% of 31892 checklistsSep 1-7: 8.2% of 26396 checklistsSep 8-14: 6.8% of 25011 checklistsSep 15-21: 6.7% of 23597 checklistsSep 22-30: 6.6% of 30638 checklistsOct 1-7: 5.1% of 23949 checklistsOct 8-14: 2.4% of 24412 checklistsOct 15-21: 0.7% of 22359 checklistsOct 22-31: 0.2% of 29794 checklistsNov 1-7: 0.1% of 21877 checklistsNov 8-14: 0% of 19742 checklistsNov 15-21: 0% of 18989 checklistsNov 22-30: 0.1% of 23905 checklistsDec 1-7: 0.1% of 16935 checklistsDec 8-14: 0.1% of 16687 checklistsDec 15-21: 0.1% of 20931 checklistsDec 22-31: 0.1% 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. Greene CountyBest early June · 27 checklists that week, 329 in all91%
  2. Schuyler CountyBest the second week of July · 37 checklists that week, 617 in all89%
  3. Scott CountyBest early July · 20 checklists that week, 320 in all88%
  4. Perry CountyBest early July · 21 checklists that week, 783 in all86%
  5. Lawrence CountyBest late June · 13 checklists that week, 719 in all85%
  6. Wabash CountyBest the second week of July · 13 checklists that week, 602 in all85%

Best spots

Share of checklists at the peak
  1. Waterfall Glen (Canyon Creek Cascade)DuPage County, best late May · 34 checklists that week, 539 in all100%
  2. Salt Creek Woods Nature PreserveCook County, best mid June · 23 checklists that week, 955 in all98%
  3. West Dupage County Forest Preserve (west)DuPage County, best late June · 22 checklists that week, 583 in all98%
  4. Horseshoe Lake-Madison State Fish and Wildlife AreaMadison County, best the second week of May · 24 checklists that week, 280 in all97%
  5. Merwin PreserveMcLean County, best late May · 45 checklists that week, 410 in all97%

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

Best time of day

In Illinois, the Indigo Bunting is most often listed on checklists started between 6 and 8 am (17% of those checklists).

0%10%20%30%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: 20% of 95511 checklists7 am: 16% of 164584 checklists8 am: 14% of 163654 checklists9 am: 12% of 141804 checklists10 am: 10% of 122882 checklists11 am: 9.1% of 100640 checklists12 pm: 8.2% of 89894 checklists1 pm: 7.8% of 82729 checklists2 pm: 7.5% of 79801 checklists3 pm: 7.1% of 82169 checklists4 pm: 7.7% of 75124 checklists5 pm: 9.8% of 57708 checklists6 pm: 12% 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
January0.1%0.1%0%0.1%
February0%0%0%0%
March0%0%0%0.1%
April0.1%0.1%0.6%5.4%
May18%30%37%35%
June31%33%35%35%
July37%35%33%33%
August32%27%22%13%
September8.2%6.8%6.7%6.6%
October5.1%2.4%0.7%0.2%
November0.1%0%0%0.1%
December0.1%0.1%0.1%0.1%

Neighboring states

  • Indiana: arrives mid April, 1 week earlier than Illinois
  • Wisconsin: arrives early May, 1 week later than Illinois
  • Michigan: arrives early May, 1 week later than Illinois
  • Iowa: arrives late April, in the same week than Illinois

Common questions

When do Indigo Buntings arrive in Illinois?
Indigo Buntings reach Illinois in late April, are common by early May, peak in early July (36% of checklists), and most are gone by mid August.
When do Indigo Buntings leave Illinois?
Most Indigo Buntings have left Illinois by mid August, when reports fall below half their usual rate. Stragglers are still reported until early October.
When is the best time to see a Indigo Bunting in Illinois?
The Indigo Bunting is reported most often in early July, on about 36% of Illinois checklists.
Where in Illinois are Indigo Buntings seen most often?
By county, Greene County, Schuyler County, and Scott County have the highest peak reporting rates for the Indigo Bunting (counties with at least 200 checklists).