Nevada chill hours

Approximately 600 to 800, according to Nevada Co-op Ext. Master Gardeners

Chill hours defined as number of hours below 45 degrees; an interruption of the chilling period can occur if winter temperatures climb above 60 degrees. Under theses conditions, degree units are actually subtracted from the chilling effect.

A tree planted near a stone patio with a south facing sun exposure may negatively effect chill needs.