Good Morning, 

Thank you for contacting the U of M Extension Service. 

Please click on this link about the Marmo maple: https://mortonarb.org/plant-and-protect/trees-and-plants/marmo-freeman-maple/#overview

Here is information from the Minnesota Dept of Natural Resources regarding fall leaf falling:

Leaves change color mainly in response to the decrease of daily sunlight. Photosynthesis, or the production of sugars that depend on sunlight, begins to slow down in response to shortening days. This leads to a reduction of chlorophyll, the pigment that supports photosynthesis and gives leaves their green color. When chlorophyll is reduced, other color pigments in the leaves begin to show, like yellow and red.

Patterns of temperature, precipitation, wind, and the timing of hard freezes can impact when fall colors peak and how long they last. While a light frost might intensify colors, a hard freeze can cause trees to drop leaves early. Rain and wind can shorten the peak color period. These weather phenomena can only be predicted a week or so in advance, making a peak color forecast difficult.

Based on the above information, you cannot control the leaf drop based on the month of the year. There are many factors involved.