Best Time to See Great Blue Herons in Iowa
May, June and August is the best time to see great blue herons in Iowa. Based on 691 verified iNaturalist observations, here is exactly when great blue herons are most active across the year in Iowa.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 20, 2026.
Great Blue Heron · Ryan CC BY
Great Blue Heron · Jay Brasher CC BY
Great Blue Heron · Public domain CC0
691 verified observations of great blue herons in Iowa, recorded across 12 months of the year on iNaturalist.
When great blue herons are recorded in Iowa
Peak month
May
116 records (16.8% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 2 | 0.3% |
| February | 5 | 0.7% |
| March | 37 | 5.4% |
| April | 77 | 11.1% |
| Maypeak | 116 | 16.8% |
| Junepeak | 105 | 15.2% |
| July | 98 | 14.2% |
| Augustpeak | 100 | 14.5% |
| September | 97 | 14% |
| October | 35 | 5.1% |
| November | 10 | 1.4% |
| December | 9 | 1.3% |
Great Blue Herons you are most likely to see
| Species | Verified observations |
|---|---|
| Great Blue Heron | 691 |
Weather to expect, source Open-Meteo
Typical weather in Iowa
Recent typical conditions by month, so you can plan a trip around both when great blue herons are active and what the weather is doing. The best months to look for great blue herons sit around 52 to 83 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 29°F | 13°F | 1.8" |
| Feb | 30°F | 11°F | 1.3" |
| Mar | 48°F | 29°F | 2.6" |
| Apr | 60°F | 39°F | 2.5" |
| Maybest time | 70°F | 52°F | 5.3" |
| Junbest time | 82°F | 63°F | 4.1" |
| Jul | 84°F | 67°F | 3.6" |
| Augbest time | 83°F | 65°F | 3" |
| Sep | 78°F | 59°F | 2.9" |
| Oct | 61°F | 44°F | 4.2" |
| Nov | 48°F | 31°F | 1.6" |
| Dec | 39°F | 23°F | 1.5" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Iowa. Weather varies year to year, so treat these as a guide.
Sightings of great blue herons in Iowa peak in May, when 116 of the year's 691 verified observations are logged — about 16.8% of the annual total. Activity stays high through May, June and August.
The quietest stretch is January, when great blue herons are hardest to find — January sees just 2 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The great blue herons you are most likely to encounter in Iowa are Great Blue Heron — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see great blue herons in Iowa
- Effigy Mounds National Monument — National Monument
- Herbert Hoover National Historic Site — National Historic Site
- Lewis & Clark National Historic Trail — National Historic Trail
- Mormon Pioneer National Historic Trail — National Historic Trail
- Saylorville Reservoir (general location—use more specific hotspots)
- Red Rock Reservoir (general location—use more specific hotspots)
Frequently asked questions
What is the best month to see great blue herons in Iowa?+
May is the single best month, and the broader peak window runs through May, June and August, based on 691 verified iNaturalist observations.
When are great blue herons hardest to see in Iowa?+
January is the quietest month for great blue herons in Iowa, with only 2 verified records.
Are great blue herons active year-round in Iowa?+
Great blue herons are recorded in 12 of 12 months in Iowa, so they can be seen year-round, with a clear peak in May.
More wildlife in Iowa