By Jude Mead

Boiling sap for maple syrup, a beloved natural sweetener produced in Norfolk, is a seasonal ritual this time of year and has a longstanding cultural tradition throughout New England. This year, the treasured tradition was under threat because unfavorable weather conditions posed significant challenges to maple syrup producers. 

Russell Russ, property manager for Great Mountain Forest, said he has experienced other years with a lower sap yield, but added that this season was a bit more unpredictable. “First it was too cold for the sap to run, then the ice storm happened, and then it got too warm. The production of maple syrup is highly dependent on specific weather conditions,” said Russ.

The process of maple syrup production relies on the natural flow of sap from sugar maple trees, which occurs during a brief window in late winter to early spring. The sap flow is triggered by a freeze-thaw cycle with the ideal temperatures reaching about 10 degrees above freezing during the day and then dipping down below freezing at night. This cycle creates pressure within the sugar maple tree causing sap to flow from the tapped holes drilled into the tree’s trunk. When the weather is too warm or if the transition from winter to spring is too rapid, the sap flow is reduced or ends prematurely, leading to lower yields of sap. It normally takes about 40 gallons of sap to make one gallon of syrup.

Shorter sap collection seasons can also affect sugar shack visits and this year the GMF crew had to plan accordingly for the annual open house in March. “We saved up enough sap from Friday to boil on Saturday and we kept the fire low so it would last throughout the day. People come for the experience of seeing the sap boil down in the evaporator and to learn about the complex work that goes into making maple syrup. We had about 80 people come through that day,” said Russ. 

GMF responded to these weather challenges by adapting innovative solutions and invested in reverse osmosis (RO) technology through a grant spearheaded by GMF’s Matt Gallagher. An RO machine helps concentrate sap by filtering out much of the water before boiling. This reduces energy costs and increases efficiency. GMF may also consider a vacuum system in the future. A vacuum system is a method of increasing the volume of sap collected by creating a slight suction force at the tap site. “Installing a vacuum system would really help during seasons like this,” said Russ.

Just as Russ thought the season was over, the weather conditions changed. “In Norfolk, much of the sap season occurs during March and March can have crazy different weather conditions. I thought the season was over twice already, but it may live on for another week! Just shows you how weather dependent we are during the entire sap season,” he said.  

GMF understands that it takes innovation and commitment to preserve this time-honored tradition. It also believes the future of maple syrup production is not just a matter of preserving sweetness on plates, but of safeguarding a rich heritage rooted in the rhythms of nature. GMF plans on doing just that because as Russ said, “There’s nothing like producing maple syrup.”