The National Weather Service has a new experimental product available which provides 6-day forecasts of evapotranspiration in a zoomable map format.  A weekly total is also available.  You can access this product at https://preview.weather.gov/graphical/.  You can find the FRET daily values by looking under Agriculture at the bottom of the product pull-down menu on the top of the map.  The official description of this experimental product is at https://www.nws.noaa.gov/om/notification/pns14national-fret_update.htm.  This product may be useful to decide when to cut hay for optimal drying or to determine irrigation needs, for example.

weekly FRET forecasts