How You Can Get Involved

We’re seeking New Yorkers to help us count all the trees in city parks across New York City! This opportunity only comes every 10 years, so don’t miss out on your chance to measure, count, and check up on our park trees to see how they’re doing.

We will provide all the necessary materials and training. No experience is necessary, just willingness to give your trees a nice, big hug!

What to Expect

When you attend one of our Trees Count events in a NYC Park, you will receive a tote bag with all the materials needed to count trees! Next, we'll provide a 20-minute training session that includes the basics of tree identification and how to measure and assess each tree.

Using our Tree Census app, you’ll split up into different zones within the park to start counting trees! You should expect to count trees for approximately one to two hours. After completing your first training event, you are welcome to continue counting trees on your own in smaller parks across the city. 

Join us for one of our Trees Count 2025 data collection events!

Street Tree Census

To count all of the street trees in New York City, Parks will be utilizing ground-based light detection and ranging (LiDAR) scans, captured on devices mounted on cars, to create three dimensional “digital twins” for each tree. These scans will be processed with machine learning algorithms to derive all sorts of important and cool metrics about our NYC street trees, including their size, species, condition, and location.

Park Tree Census

We’re hosting tree census events to engage volunteers like you to help us count, measure, and identify every tree in every park across New York City.

We will provide on-site training and tree identification guides to make sure that our volunteers are confident to be as accurate as possible.

Tree Census History

Learn more about the tree census efforts from 1995, 2005, and 2015 and see the results from each one.

View past TreesCount! censuses