Sugar maple trees are tapped in early spring to capture the sap that flows in March and April. Maple trees are not typically tapped until they are about 40 years old. Maple sap looks and tastes like water, as the sugar content is only 2-4%. Believe it or not, it takes forty gallons of sap, boiled down, to product one gallon of pure maple syrup.
The best weather conditions for sap flow are warm days (40-50 degrees F) followed by cold nights (below the freezing point). In a good maple season, one maple tree will produce about eight gallons of sap. At that rate, the sap from five trees is needed for one gallon of pure maple syrup.