Waterloo Region has some big trees. You might even call them MONSTROUSLY HUGE! We want your help finding them.

On Friday October 30, we will reveal the biggest tree found in Waterloo Region and who found it. We will also be tracking the largest tree of each species in our leaf key.  Certificates will be awarded to those who found the biggest trees of each species.

To participate, find a large tree, identify its species, note its location, and measure its circumference. Then enter your information in the Google form below.

Anyone in the WRDSB can measure any tree in Waterloo Region – at your school, local park, or even your backyard!  We can’t wait to see how teachers connect Monster Trees to math, science, art, language and social studies activities.

Location information will not be shared publicly, but we would like to know where the biggest trees are to authenticate them.

Please measure the circumference of the tree about one metre above ground height. Circumference is a measurement of how big around the tree is.

We are defining a tree as any plant with a woody stem, that is at least two meters tall and 20 centimetres in diameter.

Enter as many trees as you’d like. Take a photo and share it with us through twitter #monstertreesWRDSB.

Have fun!

This link will take you to our Submissions form.

To help prepare students for this fun activity we have prepared a few resources for our students.  Below are a few suggestions that will help make this monster hunt a success for everyone.

Watch this ‘how-to’ video of Sean measuring the circumference of a tree.

  1. Read the instructions for participants
  2. Check out our leaf key.
  3. Practice by measuring and identifying the trees near your home.

Here is the leaf key if you would like a resource to help direct your observations.  The printable version can be found on or Print Resources page.