Sap's Runnin'! Time to go Sugarin'!
The sap in a maple tree starts flowing up and down the tree when nights are freezing (below 32°F or 0°C) and days are consistently warm (around 40°F or 4.4°C). A bigger swing in temperature usually leads to a better sap run. In Vermont, the sap usually starts running around the time of Town Meeting Day. A good Sugarer analyzes the weather reports and forecasts to decide when to tap the trees.
