| Frog Species | Number Heard (or seen),* Location, & Date | Past Occurence*** | Upper Sligo | Middle Sligo | Lower Sligo |
| American Toad Bufo americanus | CHORUS heard at #8 (Boardwalk at Dallas), 4/4 CHORUS singing at #3 (University Blvd stormwater ponds), 4/7 OVERLAPPING songs at #4 (Headwaters at Ladd), 4/8 OVERLAPPING songs at #1 (Headwaters, Blueridge at Channing), 4/8 |
confirmed | confirmed | confirmed |
| Bullfrog Rana catesbeiana | INDIVIDUAL sighted near #8, at foot of Crosby St., 3/30 OVERLAPPING songs at #9 (Univ. Blvd ponds), 7/17 INDIVIDUAL singing at #7 (Godwin Drive Marsh), 7/17 |
confirmed | expected | expected |
| Green Frog Rana clamitans | None heard or seen | confirmed | expected | expected |
| Pickerel Frog Rana palustris | INDIVIDUAL singing at #3 (University Blvd stormwater ponds), 5/8 | confirmed | expected | expected |
| Wood Frog Rana sylvatica | EGG MASSES (tentative ID) at #4 (Headwaters at Ladd), 4/8 | confirmed | unlikely | possible |
| Spring Peeper Pseudacris crucifer | INDIVIDUAL singing at #7 (Godwin Drive Marsh), 3/30; INDIVIDUAL singing (tentative ID) at #5 (Wheaton Branch stormwater ponds), 3/20 |
confirmed | unlikely | possible |
| Gray Tree Frog Hyla versicolor | CHORUS singing at #3 (University Blvd stormwater ponds), 5/8 CHORUS singing at #3 (University Blvd stormwater ponds), 7/17 |
expected | unlikely | possible |
| Fowler's Toad Bufo woodhousii | None heard or seen | possible | possible | possible |
| Southern Leopard Frog Rana spenocephala | None heard or seen | unlikely | unlikely | possible |
| Striped Chorus Frog Pseudacris triseriata Eastern Spadefood Toad Scaphiopus holbrookii Green Tree Frog Hyla cinera |
None seen or heard | unlikely | unlikely | unlikely |