Brandywine Creek State Park.
With excellent woods, streams, freshwater marsh and a lake, this park in the northern part of the state, 3 miles above Wilmington, is very good for migrating warblers and flycatchers, and is one of the best places to see Connecticut Warbler in the fall. September to November is the Hawk Watch time and from the Hawk Watch Parking Lot, you get a splendid view of the Brandywine Valley.
Chapel Branch Nature Area.
There are a number of trails here that go through woods that, particularly in spring, are excellent for warblers and other migrating songbirds. Look for Ovenbirds, Worm-eating, Prothonotary, Yellow-throated, Bay-Breasted, Black-throated Blue, Black-throated Green, Parula, Blue-winged, Blackpoll, Blackburnian and Magnolia Warblers, and Veery, Swainson's Gray-Cheeked and Wood Thrushes. The two main trails are 1½ and 2½ miles, and if you have time, bird both as some birds are present on one and not the other. To get there, head south on US 13 to Seaford in southwestern Delaware, turn right on DE 20 at the light at McDonald's. Go all the way through town to the last light at Sussex Ave. Turn left and follow Sussex Ave. to the next light at the DuPont Plant. Turn right (Woodland Rd.), go around the sweeping curve to the left, and turn right into a parking lot.
Delaware Bay.
In spring, this is a major staging area for shorebird migration, with truly spectacular numbers visible during the peak of migration. Some of the recommended places to visit are Bombay Hook, Little Creek Wildlife Area, Ted Harvey Wildlife Area, Slaughter Beach, Prime Hook NWR, Cape Henlopen State Park and Rehoboth Beach.
White Clay Creek State Park.
In the northwest corner of Delaware, just north of Newark near the Maryland and Pennsylvania state lines, the most heavily birded section of the park is the creek corridor, the area that runs north-south on either side of White Clay Creek. Here spring migration peaks during the first two weeks of May, when up to 21 species of Warbler have been observed in a day. The Carpenter Recreation Area entrance to the park is located about two miles northwest of Newark on Delaware Route 896.