I really needed to do this bit of research just to help get myself up to speed on what to expect as possibilities when and where... Hope it's helpful for you too.
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| species | expected frequency | expected timeframe | expected location |
| American Toad (Bufo americanus) | medium | mid April - early May, but young males may call through late summer | flooded fields, ditches and other bodies of water |
| Fowler's Toad (Bufo fowleri) | common | late April to late June | flooded fields, ditches and other bodies of water |
| Cricket Frog (Acris crepitans) | common | late April to August | shallow margins of lakes, ponds, marshes and streams |
| Grey Treefrog (Hyla chrysoscelis) | rare | late April - August | woodland pools, roadside ditches and other temporary bodies of water |
| Spring Peeper (Pseudacris crucifer) | common | late February - May, but some males call in autumn | ponds and water-filled depressions in upland forest |
| Western Chorus Frog (Pseudacris triseriata) | common | mid February - May | ditches, flooded fields, floodplain depressions and even wet areas along busy highways |
| Plains Leopard Frog (Rana blairi) | medium | March - April | still water of pools, roadsides and drainage ditches, marshes and ponds |
| Bullfrog (Rana catesbeiana) | common | April - August | permanent bodies of water in forests, prairies and disturbed habitats |
| Green Frog (Rana clamitans) | medium | May - September | variety of shallow weedy aquatic habitats around lakes, ponds and streams in wooded areas |
| Pickerel Frog (Rana palustris) | rare | April - May | clear cool ponds |
| Southern Leopard Frog (Rana sphenocephala) | medium | late February - mid April | all sorts of shallow water haibtats |
| Wood Frog (Rana sylvatica) | rare | mid March - April | shallow vernal pools and forest ponds |
| information for expected timeframe and expected location directly from Field Guide to Amphibians and Reptiles of Illinois (Phillips, Brandon and Moll) available online at http://www.inhs.uiuc.edu/cbd/collections/AmphReptColln/herp_links/Field%20Guide/TOC.html | | | |