Ongoing

2026 City Nature Challenge

(DMV) Join community and citizen scientists all over the globe to observe wildlife: animals, plants, and fungi in backyards, neighborhoods, and parks in urban areas. Using iNaturalist to document them, you can share your observation to help scientists track the wildlife that share our urban areas. See DC metro area events here and in this calendar. Register to track you ...

Sunday Morning Bird Walk at Dyke Marsh

Dyke Marsh Alexandria

(VA) (Friends of Dyke Marsh) Join FODM for a bird walk every Sunday at 8 a.m. The Dyke Marsh Wildlife Preserve is a freshwater, tidal marsh on the Virginia side of the Potomac River in Fairfax County. It is a unit of the George Washington Memorial Parkway, U.S. National Park Service.

Free

Bird Walk + City Nature Challenge Walk at Theodore Roosevelt Is.

Theodore Roosevelt Island Washington DC

(Capital Nature) (DC Bird Alliance) (Northern VA Bird Alliance) We’ll be looking for birds and making nature observations using the iNaturalist app as part of the global City Nature Challenge—an annual effort to document local biodiversity. From songbirds to insects and plant life, every observation contributes to a broader understanding of the ecosystems around us.

Free

The Butterfly Experience

Brookside Gardens 1800 Glenallan Avenue, Wheaton

(MD) (Montgomery Parks) A world of wonder takes flight as Montgomery Parks’ popular Butterfly Experience returns to Brookside Gardens. Visitors will be surrounded by hundreds of brilliant butterflies from the Americas, Africa, and Asia as they flutter among vibrant, lush tropical blooms. This intimate experience offers rare, up-close encounters while trained staff and volunteers highlight the stages of metamorphosis, the ...

$11 – $16

CNC iNaturalist Bioblitz on Mount Vernon Trail

Daingerfield Island Marina Washington Sailing Marina 1 Marina Dr, Alexandria

(VA) (Friends of the Mount Vernon Trail) Help document and learn more about animal and plant species on the Mount Vernon Trail. Join us to find and document plants and animals for the City Nature Challenge! A Bioblitz is a communal citizen-science effort to record as many species within a designated location and time period as possible. Bioblitzes are also ...

CNC Observation with Arlington Master Naturalists

Madison Manor Park 6225 12th Rd N, Arlington

(VA) (Arlington Regional Master Naturalists) Bring curiosity and a camera (mobile phone cameras are great!) to explore the hill and hollows of Brandymore Castle for the City Nature Challenge. Photograph wild plants and critters to upload to iNtauralist to help the greater DC area excell in this friendly worldwide competition. After the guided trek, feel free to explore on your ...

Native Plant Walk at Meadowlark

Meadowlark Botanical Gardens 9750 Meadowlark Gardens, Vienna

(VA) (NOVA Parks) Experience the beauty of spring woodlands on a guided walk through Meadowlark Botanical Gardens' Potomac Valley Collection! Led by Keith Tomlinson, former Garden Manager who developed and curated Meadowlark's native plant collection, this walk offers a unique opportunity to explore the region’s rich botanical diversity. With 45 years of experience in botanical gardens, museums, environmental education, and ...

$10

CNC Observation with DC Master Naturalists

Fort Dupont Park Minnesota Ave SE, Washington DC

(VA) (Capital Nature) Join DC Master Naturalists and Capital Nature for our annual City Nature Challenge observation at Fort Dupont Park. Fort Dupont hosts some of DC's most abundant biodiversity of birds, fungi, and plants (as well as invasive plant challenges), but they often go unnoticed. Help us put this green gem on the map while you enjoy a restorative ...