Spring has the sap running and Maple trees are tapped with traditional metal buckets to collect the flowing sweet sap to make maple syrup. Central New York Marathon Maple Festival. Generally the sap starts to flow between mid-February and mid-March. The exact time of year depends upon where you live and weather conditions. Sap flows when daytime temperatures rise above freezing 32 degrees Fahrenheit / 0 Celsius and nighttime temperatures fall below freezing. The rising temperature creates pressure in the tree generating the sap flow. This is basically a transfer of the sap from the tree above the ground and the root system below the ground. The sap generally flows for 4 to 6 weeks, with the best sap produced early on in the sap-flowing season.

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