Proctor Maple Research Center | College of Agriculture and Life Sciences | The University of Vermont(title)

The Proctor Maple Research Center at the University of Vermont is the oldest maple research center in the world. Established in 1947 by Governor Mortimer Proctor it performs scientific research of maple and strives to inform sugar producers and enhance maple syrup production across the globe.


The Proctor Maple Research Center is a field research station of the Department of Plant Biology at the University of Vermont. 

The sugar maple tree (Acer saccharum) has roots in everything we do. We strive to contribute to the practical and scholarly knowledge required for the success of the maple industry, through research, demonstration, and education.

Our applied research has produced new techniques for sap collection and evaporation and for improving syrup quality, while basic research has shed light on the physiology and health of sugar maple trees and the chemistry of sap and syrup. We also serve as a field classroom for students, scientists in many disciplines, and maple syrup producers, offering presentations and tours.

We have two major stands of sugarwoods and a modern sugarhouse that support our demo sugaring operation. Each year, we put out about 5,000 taps to produce about 3,000 gallons of maple syrup.

Maple research at UVM began in the 1890s. The Proctor Maple Research Center was established in 1946, when Governor Mortimer Proctor donated the former Harvey Farm in Underhill to UVM.

Our research has enhanced knowledge of the sap flow mechanism, weather variables affecting sap yield, carbohydrate metabolism, sap biochemistry and microbiology, syrup chemistry, and wood anatomy and physiology, as well as sugar maple health in relation to various biotic and abiotic stresses such as nutrition and climate. We have recently joined, where you can search for our publications.


Maple stand in fall.

Our property consists of approximately 200 acres of wooded and open land. About 60-70 acres are sugarbush actively managed for maple syrup production and research.

In the Maple Production Research Facility, built in 2006, we conduct experiments on up to four evaporators simultaneously, each fed by a common sap source. With this set-up we have studied air injectors, pre-heaters, steam-away units, reverse osmosis, and other maple innovations.

The Sumner Hill Williams Sugarhouse was designed and built in 1993 by sugaring operations manager Sumner Williams, with the assistance of Proctor staff, volunteers, and numerous donations of materials and services. It now houses a Lapierre HyperBrix Reverse Osmosis machine and evaporator, which helped to double operational productivity in 2018.

The main laboratory building contains modern research facilities, offices, a kitchen, workshops, and a conference room for up to 75 people equipped for presentations and teaching. The conference room is available to UVM and other organizations for classroom teaching, meetings, and retreats.

various grades maple syrup in glass bottles

Proctor Maple Syrup

UVM Proctor pure maple syrup is available for purchase at the UVM Bookstore. Every drop is both organic and Audubon bird-friendly certified.

Buy proctor maple syrup online



Check out our YouTube channel for videos on maple tree research and maple syrup production.



Tune in to Vermont Maple Minute, a podcast hosted by UVM Extension maple specialist Mark Isselhardt.



Monday–Friday, 8am–4pm, by appointment only.

Unfortunately, we are too busy to schedule visits during sugaring season (late February to mid-April).



UVM Proctor Maple Research Center
364 Marvin Taylor Road
Underhill, VT 05489

(802) 899-9926 research
(802) 899-4923 sugaring