Best Time to See Great Blue Herons in Pennsylvania
September, August and July is the best time to see great blue herons in Pennsylvania. Based on 9,689 verified iNaturalist observations, here is exactly when great blue herons are most active across the year in Pennsylvania.
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 · Bill Keim CC BY
Great Blue Heron · Mila C. CC BY
Great Blue Heron · Mila C. CC BY
9,689 verified observations of great blue herons in Pennsylvania, recorded across 12 months of the year on iNaturalist.
When great blue herons are recorded in Pennsylvania
Peak month
September
1,295 records (13.4% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 365 | 3.8% |
| February | 466 | 4.8% |
| March | 418 | 4.3% |
| April | 701 | 7.2% |
| May | 982 | 10.1% |
| June | 960 | 9.9% |
| Julypeak | 1,118 | 11.5% |
| Augustpeak | 1,286 | 13.3% |
| Septemberpeak | 1,295 | 13.4% |
| October | 990 | 10.2% |
| November | 608 | 6.3% |
| December | 500 | 5.2% |
Great Blue Herons you are most likely to see
| Species | Verified observations |
|---|---|
| Great Blue Heron | 9,689 |
Weather to expect, source Open-Meteo
Typical weather in Pennsylvania
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 57 to 86 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 38°F | 23°F | 3.1" |
| Feb | 41°F | 23°F | 3.6" |
| Mar | 50°F | 31°F | 3.3" |
| Apr | 60°F | 40°F | 4.1" |
| May | 70°F | 49°F | 4.1" |
| Jun | 79°F | 59°F | 3.9" |
| Julbest time | 86°F | 65°F | 3.2" |
| Augbest time | 84°F | 64°F | 4.3" |
| Sepbest time | 75°F | 57°F | 3.9" |
| Oct | 64°F | 47°F | 4" |
| Nov | 51°F | 35°F | 2.4" |
| Dec | 43°F | 29°F | 4.3" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Pennsylvania. Weather varies year to year, so treat these as a guide.
Sightings of great blue herons in Pennsylvania peak in September, when 1,295 of the year's 9,689 verified observations are logged — about 13.4% of the annual total. Activity stays high through September, August and July.
The quietest stretch is January, March and February, when great blue herons are hardest to find — January sees just 365 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 Pennsylvania 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 Pennsylvania
- Appalachian National Scenic Trail — National Scenic Trail
- Captain John Smith Chesapeake National Historic Trail — National Historic Trail
- Chesapeake Bay
- Delaware Water Gap National Recreation Area — National Recreation Area
- Fort Necessity National Battlefield — National Battlefield
- Friendship Hill National Historic Site — National Historic Site
Frequently asked questions
What is the best month to see great blue herons in Pennsylvania?+
September is the single best month, and the broader peak window runs through September, August and July, based on 9,689 verified iNaturalist observations.
When are great blue herons hardest to see in Pennsylvania?+
January is the quietest month for great blue herons in Pennsylvania, with only 365 verified records.
Are great blue herons active year-round in Pennsylvania?+
Great blue herons are recorded in 12 of 12 months in Pennsylvania, so they can be seen year-round, with a clear peak in September.
More wildlife in Pennsylvania