Herons in Illinois in September
Yes, September is one of the best months to see herons in Illinois. It is the 3rd busiest month of the year, with 2,580 of the 19,543 sightings logged across the year (13.2%), based on verified iNaturalist records.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Peak month for herons in Illinois
13.2%
of yearly sightings
2,580
records in September
#3
busiest month of 12
19,543
verified records a year
August 15.9%, September 13.2%, October 6.2%. Busiest month is May at 19%.
19,543 verified observations of herons in Illinois, recorded across 12 months of the year on iNaturalist.
When herons are recorded in Illinois
Peak month
May
3,722 records (19% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 202 | 1% |
| February | 176 | 0.9% |
| March | 517 | 2.6% |
| April | 2,451 | 12.5% |
| Maypeak | 3,722 | 19% |
| June | 2,403 | 12.3% |
| July | 2,521 | 12.9% |
| Augustpeak | 3,117 | 15.9% |
| Septemberpeak | 2,580 | 13.2% |
| October | 1,202 | 6.2% |
| November | 410 | 2.1% |
| December | 242 | 1.2% |
Herons you are most likely to see
| Species | Verified observations |
|---|---|
| Great Blue Heron | 8,420 |
| Great Egret | 3,896 |
| Black-crowned Night Heron | 3,370 |
| Green Heron | 2,785 |
| Little Blue Heron | 278 |
| Yellow-crowned Night Heron | 180 |
| Snowy Egret | 152 |
| American Bittern | 139 |
In Illinois, September carries 13.2% of the year's herons sightings, about 4.9 points above an even month-to-month split. That makes it the 3rd busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from August (15.9%) into September, and it heads toward October (6.2%) after. This is right inside the peak window, so September is one of the surest months to plan a trip around.
The herons most often recorded in Illinois are Great Blue Heron, Great Egret and Black-crowned Night Heron. Those counts are annual totals rather than a September split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in September itself.
Which herons you are most likely to see
- Great Blue Heron8,420 records
- Great Egret3,896 records
- Black-crowned Night Heron3,370 records
- Green Heron2,785 records
- Little Blue Heron278 records
- Yellow-crowned Night Heron180 records
Plan your heron trip in Illinois
Start with live tours near Lewis & Clark National Historic Trail, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Lewis & Clark National Historic Trail
Use the live GetYourGuide widget to compare local departures and activity styles close to the main heron viewing area.
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Stay nearbyStay near Lewis & Clark National Historic Trail
Compare hotels, cabins and lodges close to the best heron viewing area in Illinois.
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Broader backupBook a heron tour in Illinois
Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Gear to see them
Frequently asked questions
Can you see herons in Illinois in September?+
Yes. September accounts for 2,580 of the 19,543 verified herons sightings logged in Illinois across the year, which is 13.2% of the annual total.
Is September a good time to see herons in Illinois?+
September is one of the best months. It ranks 3rd of the year and sits inside the peak window of May, August and September.
What month is best for herons in Illinois?+
May is the single busiest month, with the broader peak running through May, August and September, based on 19,543 verified observations.
Which herons are you most likely to see in Illinois?+
The most-recorded species in Illinois are Great Blue Heron, Great Egret and Black-crowned Night Heron, based on all-time iNaturalist counts.
See herons in Illinois in other months
More places to see herons
More wildlife in Illinois