The sugars in sap provide fuel for the tree to grow and thrive. When the pressure changes inside a tree, usually due to changing temperatures, the sap is forced into the vascular transporting tissues. Any time those tissues are punctured in a maple tree, you may see a maple tree oozing sap.

What time of year do maple trees drip sap?

When To Tap Maple Trees 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.

What is sap for maple trees?

Significance. Sap in a maple tree, or any tree, is comparable to human blood. It is the substance that moves water, sugars and nutrients throughout the tree. The process of utilizing a tree for its sap begins as sugar is produced in the leaves during the process of photosynthesis.