Big Tree Measure 2026: Citizen Science in Carmarthenshire

Grab your walking boots and step into the great outdoors for the Big Tree Measure on Saturday, 10 October 2026. Set within the picturesque rural landscapes of Carmarthenshire, this engaging citizen science initiative is hosted alongside The Carbon Community, inviting volunteers of all backgrounds to play an active part in groundbreaking environmental research.

What is the Big Tree Measure?

The Big Tree Measure is a hands-on event designed to record the development and vitality of thousands of newly planted trees. Working directly alongside dedicated researchers and woodland conservationists, participants learn how to collect vital forestry data that underpins large-scale carbon sequestration studies.

By tracking real-world tree growth, you will help researchers understand how various native planting methods, ground enhancements, and soil microbiomes influence how quickly trees absorb carbon from the atmosphere. Every measurement recorded directly feeds into live scientific studies exploring scalable, nature-based climate solutions.

What to Expect on the Day

Whether you are an aspiring ecologist, a passionate conservation volunteer, or simply eager to spend an autumn Saturday in the Welsh countryside, the event offers a warm, collaborative environment for everyone. Full guidance and equipment are provided on arrival, so no previous forestry experience is required.

• Practical Field Training: Learn how to properly use specialised forestry equipment, including tree callipers and girth tapes, to record stem diameter and tree height accurately.
• Hands-On Recording: Work in small, friendly teams across designated research plots to monitor native broadleaf trees such as oak, birch, and alder.
• Insights from Scientists: Chat directly with research leaders from The Carbon Community to discover how soil fungi, crushed basalt, and biodiversity interventions affect forest carbon capture.
• A Rewarding Outdoor Experience: Enjoy fresh air, community spirit, and the satisfaction of contributing to long-term woodland science.

How to Prepare

Carmarthenshire's upland terrain can be varied and autumn weather unpredictable, so arriving prepared ensures a comfortable and enjoyable experience for all participants.

• Footwear: Sturdy walking boots or wellington boots with deep tread are essential for walking across uneven grassland and muddy ground.
• Clothing: Dress in warm, breathable layers and bring reliable waterproofs, including a waterproof jacket and trousers.
• Refreshments: Bring a packed lunch, plenty of drinking water, and a thermos of your favourite hot beverage for field breaks.
• Work Gloves: A tough pair of gardening or work gloves is recommended to keep hands protected and warm while handling foliage and measuring tools.

Spaces for the Big Tree Measure on Saturday, 10 October 2026 are limited to ensure all volunteer groups receive proper guidance and support throughout the day. Secure your spot, wrap up warm, and help measure the future of Welsh woodlands.