Outer Green Island, Casco Bay

Maine · Northeast

ChallengingView on eBird

Habitat

Coastal

Best Seasons

Spring Fall

Difficulty

Challenging

Best Months

April-May, September-October

About This Location

Outer Green Island, Casco Bay is a productive birding destination in Maine, with 201 species recorded on eBird. This coastal habitat attracts a wide variety of species among many others. Spring and fall migration bring waves of warblers and shorebirds through the area.

Location

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Notable Species

Sanderling Brown Pelican Osprey Royal Tern Willet

Live Bird Data

Notable Sightings

Rare or unusual species spotted nearby in the last 14 days

Lesser Scaup

Aythya affinis

3/6/2026Dyer Point1 observed

Common Murre

Uria aalge

3/5/2026Dyer Point1 observed

Fish Crow

Corvus ossifragus

3/5/2026Allagash Brewing Co.2 observed

Yellow-bellied Sapsucker

Sphyrapicus varius

3/5/2026River Point Conservation Area, Falmouth1 observed

Lesser Black-backed Gull

Larus fuscus

3/4/2026Mill Creek Cove1 observed

Brown-headed Cowbird

Molothrus ater

3/4/2026102 Tuttle Rd Yard, Cumberland1 observed

Eastern Screech-Owl

Megascops asio

3/4/202604050, Long Island US-ME (43.6875,-70.1620)

Merlin

Falco columbarius

3/3/2026Spurwink Marsh at Sawyer Road1 observed

Wood Duck

Aix sponsa

3/3/2026Spurwink River Crossing1 observed

Fox Sparrow

Passerella iliaca

3/2/2026Hermit Island, Phippsburg2 observed

Birding Tips

1
Check rocky shorelines and jetties at low tide for shorebirds.
2
Scan offshore waters with a spotting scope for seabirds and waterfowl.
3
Visit during mid-May for peak warbler migration.

Amenities

Parking

Trails

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Maine Birding Guide

Complete guide to birding in Maine →

Birding Guides

The Ultimate Guide to Fall Bird Migration: Hawks, Sparrows, and Confusing Plumages

10 min read

Understanding Bird Migration: When, Where, and Why Birds Migrate

12 min read

Spring Birding in New York City: The Complete Urban Migration Guide

12 min read

Frequently Asked Questions

When is the best time to visit Outer Green Island, Casco Bay for birding?▼

The best months to visit Outer Green Island, Casco Bay for birding are April-May, September-October. The best seasons are Spring and Fall.

What birds can I see at Outer Green Island, Casco Bay?▼

Notable species at Outer Green Island, Casco Bay include Sanderling, Brown Pelican, Osprey, Royal Tern, Willet. The area supports coastal habitats.

How difficult is birding at Outer Green Island, Casco Bay?▼

Birding at Outer Green Island, Casco Bay is rated as Challenging. The terrain can be challenging and may require good physical fitness and preparation.

What amenities are available at Outer Green Island, Casco Bay?▼

Outer Green Island, Casco Bay offers the following amenities: Parking, Trails.