Birding spots · Illinois
Best Birding Spots in Warren County, Illinois
Glass Lake leads Warren County's birding spots with 118 species reported, best in spring. 3 spots in the county have enough data to rank.
Species counts are birds reported at least three times in that season at that spot, 2016–2025. Busy spots list more species simply because more people look, so compare the checklist counts. Spot names come from public map data and hotspot listings.
| Spot | Species | Winter | Spring | Summer | Fall |
|---|---|---|---|---|---|
| Glass Lake | 118 | 20 | 102 | 65 | 75 |
| Birding spot near Monmouth | 113 | 8 | 72 | 45 | 82 |
| Birding spot near Monmouth (south) | 65 | 3 | 34 | 26 | 38 |