Spring migration is in full swing – songbird and shorebird migration peak during the first 3 weeks. Penn’s Woods come alive as the “southern” breeders set up territories and the migrants move through. 20 warbler species are possible in a day. The last week of the month along the Delaware bayshore is peak refueling time for knots, sanderlings and turnstones as they feed on horseshoe crab eggs.
Bowman’s Hill, Bucks County, PA
The last 3 weeks of the months are good for breeders such as Kentucky and Worm-eating Warbler and Louisiana Waterthrush, Pileated Woodpecker, Acadian Flycatcher, Scarlet Tanager, Rose-breasted Grosbeak, Yellow-throated Vireo and even possibly Cerulean Warbler. The tower area is good for migrating Blackburian Warblers.
Bowman's Hill webpage
Delaware Bay Shore; Reeds Beach, Thompson’s Beach, Cape May County, NJ and Mispillion Harbor, Sussex County, DE
Red Knots, Sanderlings, Turnstones, Laughing Gulls are all feeding on Horseshoe Crab eggs, fueling northbound migration
Brandywine Creek SP and the adjoining Woodland Estates, New Castle County, DE
This is (arguably) the most attractive area of Delaware and has trails for walking, mountain biking and horses. All of these trails which can give an excellent selection of resident, nesting migrant and through-passage migrants.
Brandywine Creek SP webpage
John Heinz NWR “Tinicum”, Philadelphia County, PA
The “warbler woods” near the nature center can at times be sensational for migrating passerines, including allthe later warblers, as well as Rose-breasted Grosbeak and Scarlet Tanager. Nesters include both orioles, Warbling Vireo, Willow Flycatcher and Marsh Wren. Plus, there is always the possibility of seeing some great marsh birds, such as rails bitterns, and egrets.
John Heinz NWR webpage
Heislerville WMA, Cumberland Co, NJ
The impoundments offer a wide variety of shorebirds sometimes with large concentrations of Semipalmated Sandpipers, Short-billed Dowitchers and Dunlins. It has been in recent years the best site to find Curlew Sandpipers during the last 2 weeks of the month. Waders, terns and gulls can also be found here.
Ridley Creek SP, Delaware Co, PA
A 2 mile loop along the bridle trail leading from Gradyville Road should produce an assortment of warblers including Blue-winged, Chestnut-sided and singing Kentucky, Yellow-throated Vireo, Wood Thrushes and Veeries as well as Acadian Flycatcher and Louisiana Waterthrushes along the creek. It is also a good spot to find migrating Canada Warblers during the 3rd week of the month.
Belleplain State Forest, Cape May Co, NJ
A wonderful spot for breeding Prothonotary, Hooded, Prairie, Pine and Worm-eating Warbler, Louisiana Waterthrush, Acadian Flycatcher, Summer and Scarlet Tanager.
Pennypack Creek Park, Phila County, PA
Great place before the trees leaf out, with the warblers loving those oak trees.