Big Tree Registry

Photo by Alex Harris /
Raincoast Conservation Foundation.

Big Tree Registries are community-science driven initiatives that not only raise awareness about the importance of healthy trees and forests but also help identify areas of high conservation priority, providing valuable information to encourage the protection of iconic trees.

Man walking through an old growth forest.
Photo by Alex Harris.

Pender Islands Big Tree Registry

The Pender Islands Big Tree Registry, launched in September 2019, aims to raise awareness about the rare and endangered status of Coastal Douglas-fir (CDF) forests and associated ecosystems characteristic to the Gulf Islands. It is a growing database of the big trees found around North and South Pender Islands, with plans to expand to additional southern Gulf Islands in late 2021. The registry has been modelled, with permission, after the University of British Columbia’s (UBC) big tree registry.

The CDF biogeoclimatic zone is among the most biodiverse zones in the province. It is also the most degraded. It is the least-protected zone in BC with less than 1% of its forests remaining as old growth and less than 10% older than 120 years.

Contribute to the Pender Islands Big Tree Registry

Like other big tree registries, trees are nominated by community members who collect species information along with a few simple measurements including trunk diameter at breast height (DBH), height, and crown spread. Nominations are made using the iNaturalist smartphone app, a Google Form submission, or manually using a prepared datasheet (PDF) depending on the nominator’s preference. These nominations are then verified by a qualified professional working with Raincoast Conservation Foundation to ensure measurements and location information have been accurately recorded. Findings will be used to document the biodiversity on Pender Islands and data may be useful for a number of potential projects.

Measurement guidelines

For more information on how to measure big trees, including tools you will need, photography tips, safety information, and how to measure irregular trees use Raincoast’s big tree measurement guidelines. 

Measurement Guidelines (PDF)

Other registries

Find out about other registries from other regions.

Other registries

Thank you

RBC Tech for Nature logo.

Recent articles

A person in a red hat and red shirt stands with their back to the camera in the forest.

Elders for old-growth

Celebrating the people who have created a legacy of speaking up for nature and inspiring the next generation to do the same.
Illustrated map of Metro Vancouver highlighting major roadways, streams, and mountains in the background.

Raincoast delivers a water quality toolbox to Metro Vancouver

Water is vital to all, and its protection requires a strong understanding of what threatens it.
A spirit bear climbs a tree in a green forest, surrounded by mossy trees.

Win an all-inclusive, adventure of a lifetime 6-night package at Spirit Bear Lodge

Immerse yourself in the places you love most! Explore the largest intact coastal temperate rainforest on earth from British Columbia’s most remote wildlife viewing lodge. Raincoast is partnering with Indigenous owned and led Spirit Bear Lodge to offer an all-inclusive 6-night package in the Unceded Traditional Territory of the Kitasoo Xai’xais First Nation. The winning…
A Southern Resident killer whale's dorsal fin breaks the surface of blue water.

Extinction is too high a price for a pipeline

The federal government has taken the first step toward fast-tracking a new oil pipeline and tanker terminal in the Fraser River Estuary – bypassing the environmental review that would normally assess its risks, impacts, and merit.